W3C

Web Services Description Language (WSDL) Version 2.0 Part 1: Core Language

W3C Candidate Recommendation 6 January 2006
Non-normative version with Z Notation

Normative version at:
http://www.w3.org/TR/2006/CR-wsdl20-20060106
Latest version:
http://www.w3.org/TR/wsdl20
Previous versions:
http://www.w3.org/TR/2005/WD-wsdl20-20050803
Editors:
Roberto Chinnici, Sun Microsystems
Jean-Jacques Moreau, Canon
Arthur Ryman, IBM
Sanjiva Weerawarana, WSO2

This document is also available in these non-normative formats: XHTML with Z Notation, PDF, PDF with Z Notation, PostScript, XML, and plain text.


Abstract

This document describes the Web Services Description Language Version 2.0 (WSDL 2.0), an XML language for describing Web services. This specification defines the core language which can be used to describe Web services based on an abstract model of what the service offers. It also defines the conformance criteria for documents in this language.

Status of this Document

This section describes the status of this document at the time of its publication. Other documents may supersede this document. A list of current W3C publications and the latest revision of this technical report can be found in the W3C technical reports index at http://www.w3.org/TR/.

This is the W3C Candidate Recommendation of Web Services Description Language (WSDL) Version 2.0 Part 1: Core Language for review by W3C Members and other interested parties. It has been produced by the Web Services Description Working Group, which is part of the W3C Web Services Activity. The publication of this document signifies a call for implementations of this specification. This specification will remain a Candidate Recommendation at least until 15 March 2006.

This Working Draft addresses all the comments received during the second Last Call review period on the WSDL 2.0 drafts. The detailed disposition of the comments received can be found in the Last Call issues list. A diff-marked version against the previous version of this document is available. For a detailed list of changes since the last publication of this document, please refer to appendix E. Part 1 Change Log.

The Working Group plans to submit this specification for consideration as a W3C Proposed Recommendation if the following exit criteria have been met:

The sections 2.7 Feature and 2.8 Property in this specification, defining the feature and property components, are considered at risk. The Working Group may recommend to remove the components from the specification, depending on their use and the implementations.

Implementers are encouraged to provide feedback by 15 March 2006. Comments on this document are to be sent to the public public-ws-desc-comments@w3.org mailing list (public archive).

Issues about this document are recorded in the Candidate Recommendation issues list maintained by the Working Group. A list of formal objections against the set of WSDL 2.0 Working Drafts is also available.

Publication as a Candidate Recommendation does not imply endorsement by the W3C Membership. This is a draft document and may be updated, replaced or obsoleted by other documents at any time. It is inappropriate to cite this document as other than work in progress.

This document has been produced under the 24 January 2002 Current Patent Practice as amended by the W3C Patent Policy Transition Procedure. Patent disclosures relevant to this specification may be found on the Working Group's patent disclosure page. An individual who has actual knowledge of a patent which the individual believes contains Essential Claim(s) with respect to this specification should disclose the information in accordance with section 6 of the W3C Patent Policy.


Short Table of Contents

1. Introduction
2. Component Model
3. Types
4. Modularizing WSDL 2.0 descriptions
5. Documentation
6. Language Extensibility
7. Locating WSDL 2.0 Documents
8. Conformance
9. XML Syntax Summary (Non-Normative)
10. References
A. The application/wsdl+xml Media Type
B. Acknowledgements (Non-Normative)
C. IRI-References for WSDL 2.0 Components (Non-Normative)
D. Component Summary (Non-Normative)
E. Part 1 Change Log (Non-Normative)
F. Assertion Summary (Non-Normative)


Table of Contents

1. Introduction
    1.1 Web Service
    1.2 Document Conformance
    1.3 The Meaning of a Service Description
    1.4 Notational Conventions
        1.4.1 RFC 2119 Keywords
        1.4.2 RFC 3986 Namespaces
        1.4.3 XML Schema anyURI
        1.4.4 Prefixes and Namespaces Used in This Specification
        1.4.5 Terms Used in This Specification
        1.4.6 XML Information Set Properties
        1.4.7 WSDL 2.0 Component Model Properties
        1.4.8 Z Notation
        1.4.9 BNF Pseudo-Schemas
        1.4.10 Assertions
2. Component Model
    2.1 Description
        2.1.1 The Description Component
        2.1.2 XML Representation of Description Component
            2.1.2.1 targetNamespace attribute information item
        2.1.3 Mapping Description's XML Representation to Component Properties
    2.2 Interface
        2.2.1 The Interface Component
        2.2.2 XML Representation of Interface Component
            2.2.2.1 name attribute information item with interface [owner element]
            2.2.2.2 extends attribute information item
            2.2.2.3 styleDefault attribute information item
        2.2.3 Mapping Interface's XML Representation to Component Properties
    2.3 Interface Fault
        2.3.1 The Interface Fault Component
        2.3.2 XML Representation of Interface Fault Component
            2.3.2.1 name attribute information item with fault [owner element]
            2.3.2.2 element attribute information item with fault [owner element]
        2.3.3 Mapping Interface Fault's XML Representation to Component Properties
    2.4 Interface Operation
        2.4.1 The Interface Operation Component
            2.4.1.1 Message Exchange Pattern
            2.4.1.2 Operation Style
        2.4.2 XML Representation of Interface Operation Component
            2.4.2.1 name attribute information item with operation [owner element]
            2.4.2.2 pattern attribute information item with operation [owner element]
            2.4.2.3 style attribute information item with operation [owner element]
        2.4.3 Mapping Interface Operation's XML Representation to Component Properties
    2.5 Interface Message Reference
        2.5.1 The Interface Message Reference Component
        2.5.2 XML Representation of Interface Message Reference Component
            2.5.2.1 messageLabel attribute information item with input or output [owner element]
            2.5.2.2 element attribute information item with input or output [owner element]
        2.5.3 Mapping Interface Message Reference's XML Representation to Component Properties
    2.6 Interface Fault Reference
        2.6.1 The Interface Fault Reference Component
        2.6.2 XML Representation of Interface Fault Reference
            2.6.2.1 ref attribute information item with infault, or outfault [owner element]
            2.6.2.2 messageLabel attribute information item with infault, or outfault [owner element]
        2.6.3 Mapping Interface Fault Reference's XML Representation to Component Properties
    2.7 Feature
        2.7.1 The Feature Component
            2.7.1.1 Feature Composition Model
                2.7.1.1.1 Example of Feature Composition Model
        2.7.2 XML Representation of Feature Component
            2.7.2.1 ref attribute information item with feature [owner element]
            2.7.2.2 required attribute information item with feature [owner element]
        2.7.3 Mapping Feature's XML Representation to Component Properties
    2.8 Property
        2.8.1 The Property Component
            2.8.1.1 Property Composition Model
        2.8.2 XML Representation of Property Component
            2.8.2.1 ref attribute information item with property [owner element]
            2.8.2.2 value element information item with property [parent]
            2.8.2.3 constraint element information item with property [parent]
        2.8.3 Mapping Property's XML Representation to Component Properties
    2.9 Binding
        2.9.1 The Binding Component
        2.9.2 XML Representation of Binding Component
            2.9.2.1 name attribute information item with binding [owner element]
            2.9.2.2 interface attribute information item with binding [owner element]
            2.9.2.3 type attribute information item with binding [owner element]
            2.9.2.4 Binding extension elements
        2.9.3 Mapping Binding's XML Representation to Component Properties
    2.10 Binding Fault
        2.10.1 The Binding Fault Component
        2.10.2 XML Representation of Binding Fault Component
            2.10.2.1 ref attribute information item with fault [owner element]
            2.10.2.2 Binding Fault extension elements
        2.10.3 Mapping Binding Fault's XML Representation to Component Properties
    2.11 Binding Operation
        2.11.1 The Binding Operation Component
        2.11.2 XML Representation of Binding Operation Component
            2.11.2.1 ref attribute information item with operation [owner element]
            2.11.2.2 Binding Operation extension elements
        2.11.3 Mapping Binding Operation's XML Representation to Component Properties
    2.12 Binding Message Reference
        2.12.1 The Binding Message Reference Component
        2.12.2 XML Representation of Binding Message Reference Component
            2.12.2.1 messageLabel attribute information item with input or output [owner element]
            2.12.2.2 Binding Message Reference extension elements
        2.12.3 Mapping Binding Message Reference's XML Representation to Component Properties
    2.13 Binding Fault Reference
        2.13.1 The Binding Fault Reference Component
        2.13.2 XML Representation of Binding Fault Reference Component
            2.13.2.1 ref attribute information item with infault or outfault [owner element]
            2.13.2.2 messageLabel attribute information item with infault or outfault [owner element]
            2.13.2.3 Binding Fault Reference extension elements
        2.13.3 Mapping Binding Fault Reference's XML Representation to Component Properties
    2.14 Service
        2.14.1 The Service Component
        2.14.2 XML Representation of Service Component
            2.14.2.1 name attribute information item with service [owner element]
            2.14.2.2 interface attribute information item with service [owner element]
        2.14.3 Mapping Service's XML Representation to Component Properties
    2.15 Endpoint
        2.15.1 The Endpoint Component
        2.15.2 XML Representation of Endpoint Component
            2.15.2.1 name attribute information item with endpoint [owner element]
            2.15.2.2 binding attribute information item with endpoint [owner element]
            2.15.2.3 address attribute information item with endpoint [owner element]
            2.15.2.4 Endpoint extension elements
        2.15.3 Mapping Endpoint's XML Representation to Component Properties
    2.16 XML Schema 1.0 Simple Types Used in the Component Model
    2.17 Equivalence of Components
    2.18 Symbol Spaces
    2.19 QName resolution
    2.20 Comparing URIs and IRIs
3. Types
    3.1 Using W3C XML Schema Description Language
        3.1.1 Importing XML Schema
            3.1.1.1 namespace attribute information item
            3.1.1.2 schemaLocation attribute information item
        3.1.2 Inlining XML Schema
            3.1.2.1 targetNamespace attribute information item
        3.1.3 References to Element Declarations and Type Definitions
    3.2 Using Other Schema Languages
    3.3 Describing Messages that Refer to Services and Endpoints
        3.3.1 wsdlx:interface attribute information item
        3.3.2 wsdlx:binding attribute information item
        3.3.3 wsdlx:interface and wsdlx:binding Consistency
        3.3.4 Use of wsdlx:interface and wsdlx:binding with xs:anyURI
4. Modularizing WSDL 2.0 descriptions
    4.1 Including Descriptions
        4.1.1 location attribute information item with include [owner element]
    4.2 Importing Descriptions
        4.2.1 namespace attribute information item
        4.2.2 location attribute information item with import [owner element]
5. Documentation
6. Language Extensibility
    6.1 Element based Extensibility
        6.1.1 Mandatory extensions
        6.1.2 required attribute information item
    6.2 Attribute-based Extensibility
    6.3 Extensibility Semantics
7. Locating WSDL 2.0 Documents
    7.1 wsdli:wsdlLocation attribute information item
8. Conformance
    8.1 XML Information Set Conformance
9. XML Syntax Summary (Non-Normative)
10. References
    10.1 Normative References
    10.2 Informative References

Appendices

A. The application/wsdl+xml Media Type
    A.1 Registration
    A.2 Fragment Identifiers
        A.2.1 The Description Component
        A.2.2 The Element Declaration Component
        A.2.3 The Type Definition Component
        A.2.4 The Interface Component
        A.2.5 The Interface Fault Component
        A.2.6 The Interface Operation Component
        A.2.7 The Interface Message Reference Component
        A.2.8 The Interface Fault Reference Component
        A.2.9 The Binding Component
        A.2.10 The Binding Fault Component
        A.2.11 The Binding Operation Component
        A.2.12 The Binding Message Reference Component
        A.2.13 The Binding Fault Reference Component
        A.2.14 The Service Component
        A.2.15 The Endpoint Component
        A.2.16 The Feature Component
        A.2.17 The Property Component
        A.2.18 Extension Components
    A.3 Security considerations
B. Acknowledgements (Non-Normative)
C. IRI-References for WSDL 2.0 Components (Non-Normative)
    C.1 WSDL 2.0 IRIs
    C.2 Example
D. Component Summary (Non-Normative)
E. Part 1 Change Log (Non-Normative)
    E.1 WSDL 2.0 Specification Changes
F. Assertion Summary (Non-Normative)


1. Introduction

Web Services Description Language Version 2.0 (WSDL 2.0) provides a model and an XML format for describing Web services. WSDL 2.0 enables one to separate the description of the abstract functionality offered by a service from concrete details of a service description such as “how” and “where” that functionality is offered.

This specification defines a language for describing the abstract functionality of a service as well as a framework for describing the concrete details of a service description. It also defines the conformance criteria for documents in this language. The WSDL Version 2.0 Part 2: Adjuncts specification [WSDL 2.0 Adjuncts] describes extensions for Message Exchange Patterns, SOAP modules, and a language for describing such concrete details for SOAP 1.2 [SOAP 1.2 Part 1: Messaging Framework] and HTTP [IETF RFC 2616].

1.1 Web Service

WSDL 2.0 describes a Web service in two fundamental stages: one abstract and one concrete. Within each stage, the description uses a number of constructs to promote reusability of the description and to separate independent design concerns.

At an abstract level, WSDL 2.0 describes a Web service in terms of the messages it sends and receives; messages are described independent of a specific wire format using a type system, typically XML Schema.

An operation associates a message exchange pattern with one or more messages. A message exchange pattern identifies the sequence and cardinality of messages sent and/or received as well as who they are logically sent to and/or received from. An interface groups together operations without any commitment to transport or wire format.

At a concrete level, a binding specifies transport and wire format details for one or more interfaces. An endpoint associates a network address with a binding. And finally, a service groups together endpoints that implement a common interface.

1.2 Document Conformance

An element information item (as defined in [XML Information Set]) whose namespace name is "http://www.w3.org/2006/01/wsdl" and whose local part is description conforms to this specification if it is valid according to the XML Schema for that element as defined by this specification (http://www.w3.org/2006/01/wsdl/wsdl20.xsd) and additionally adheres to all the constraints contained in this specification family and conforms to the specifications of any extensions contained in it. Such a conformant element information item constitutes a WSDL 2.0 document.

The definition of the WSDL 2.0 language is based on the XML Information Set [XML Information Set] but also imposes many semantic constraints over and above structural conformance to this XML Infoset. In order to precisely describe these constraints, and as an aid in precisely defining the meaning of each WSDL 2.0 document, the WSDL 2.0 specification defines a component model 2. Component Model as an additional layer of abstraction above the XML Infoset. Constraints and meaning are defined in terms of this component model, and the definition of each component includes a mapping that specifies how values in the component model are derived from corresponding items in the XML Infoset.

An XML 1.0 document that is valid with respect to the WSDL 2.0 XML Schema and that maps to a valid WSDL 2.0 Component Model is conformant to the WSDL 2.0 specification.

1.3 The Meaning of a Service Description

A WSDL 2.0 service description indicates how potential clients are intended to interact with the described service. It represents an assertion that the described service fully implements and conforms to what the WSDL 2.0 document describes. For example, as further explained in section 6.1.1 Mandatory extensions, if the WSDL 2.0 document specifies a particular optional extension, the functionality implied by that extension is only optional to the client. It must be supported by the Web service.

A WSDL 2.0 interface describes potential interaction with a service--not required interaction. The declaration of an operation in a WSDL 2.0 interface is not an assertion that the interaction described by the operation must occur. Rather it is an assertion that if such an interaction is (somehow) initiated, then the declared operation describes how that interaction is intended to occur.

1.4 Notational Conventions

All parts of this specification are normative, with the EXCEPTION of notes, pseudo-schemas, examples, and sections explicitly marked as “Non-Normative”.

1.4.1 RFC 2119 Keywords

The keywords “MUST”, “MUST NOT”, “REQUIRED”, “SHALL”, “SHALL NOT”, “SHOULD”, “SHOULD NOT”, “RECOMMENDED”, “MAY”, and “OPTIONAL” in this document are to be interpreted as described in RFC 2119 [IETF RFC 2119].

1.4.2 RFC 3986 Namespaces

Namespace names of the general form:

  • "http://example.org/..." and

  • "http://example.com/..."

represent application or context-dependent URIs [IETF RFC 3986].

1.4.3 XML Schema anyURI

This specification uses the XML Schema type xs:anyURI (see [XML Schema: Datatypes]). It is defined so that xs:anyURI values are essentially IRIs (see [IETF RFC 3987]). The conversion from xs:anyURI values to an actual URI is via an escaping procedure defined by (see [XML Linking Language (XLink) 1.0]), which is identical in most respects to IRI Section 3.1.

For interoperability, WSDL authors are advised to avoid the US-ASCII characters: "<", ">", '"', space, "{", "}", "|", "\", "^", and "`", which are allowed by the xs:anyURI type, but disallowed in IRIs.

1.4.4 Prefixes and Namespaces Used in This Specification

This specification uses predefined namespace prefixes throughout; they are given in the following list. Note that the choice of any namespace prefix is arbitrary and not semantically significant (see [XML Namespaces]).

wsdl

"http://www.w3.org/2006/01/wsdl"

Defined by this specification.

wsdli

"http://www.w3.org/2006/01/wsdl-instance"

Defined by this specification 7.1 wsdli:wsdlLocation attribute information item.

wsdlx

"http://www.w3.org/2006/01/wsdl-extensions"

Defined by this specification 3.3 Describing Messages that Refer to Services and Endpoints.

wrpc

"http://www.w3.org/2006/01/wsdl/rpc"

Defined by WSDL 2.0: Adjuncts [WSDL 2.0 Adjuncts].

wsoap

"http://www.w3.org/2006/01/wsdl/soap"

Defined by WSDL 2.0: Adjuncts [WSDL 2.0 Adjuncts].

whttp

"http://www.w3.org/2006/01/wsdl/http"

Defined by WSDL 2.0: Adjuncts [WSDL 2.0 Adjuncts].

xs

"http://www.w3.org/2001/XMLSchema"

Defined in the W3C XML Schema specification [XML Schema: Structures], [XML Schema: Datatypes].

xsi

"http://www.w3.org/2001/XMLSchema-instance"

Defined in the W3C XML Schema specification [XML Schema: Structures], [XML Schema: Datatypes].

1.4.5 Terms Used in This Specification

This section describes the terms and concepts introduced in Part 1 of the WSDL Version 2.0 specification (this document).

Actual Value

As in [XML Schema: Structures], the phrase actual value is used to refer to the member of the value space of the simple type definition associated with an attribute information item which corresponds to its normalized value. This will often be a string, but may also be an integer, a boolean, an IRI-reference, etc.

Inlined Schema

An XML schema that is defined in the xs:types element information item of a WSDL 2.0 description. For example, an XML Schema defined in an xs:schema element information item 3.1.2 Inlining XML Schema.

1.4.6 XML Information Set Properties

This specification refers to properties in the XML Information Set [XML Information Set]. Such properties are denoted by square brackets, e.g. [children], [attributes].

1.4.7 WSDL 2.0 Component Model Properties

This specification defines and refers to properties in the WSDL 2.0 Component Model 2. Component Model. Such properties are denoted by curly brackets, e.g. {name}, {interfaces}.

This specification uses a consistent naming convention for component model properties that refer to components. If a property refers to a required or optional component, then the property name is the same as the component name. If a property refers to a set of components, then the property name is the pluralized form of the component name.

1.4.8 Z Notation

Z Notation [Z Notation Reference Manual] was used in the development of this specification. Z Notation is a formal specification language that is based on standard mathematical notation. The Z Notation for this specification has been verified using the Fuzz 2000 type-checker [Fuzz 2000].

Since Z Notation is not widely known, it is not included the normative version of this specification. However, it is included in a non-normative version which allows to dynamically hide and show the Z Notation. Browsers correctly display the mathematical Unicode characters, provided that the required fonts are installed. Mathematical fonts for Mozilla Firefox can be downloaded from the Mozilla Web site.

The Z Notation was used to improve the quality of the normative text that defines the Component Model, and to help ensure that the test suite covered all important rules implied by the Component Model. However, the Z Notation is non-normative, so any conflict between it and the normative text is an error in the Z Notation. Readers and implementors may nevertheless find the Z Notation useful in cases where the normative text is unclear.

There are two elements of Z Notation syntax that conflict with the notational conventions described in the preceding sections. In Z Notation, square brackets are used to introduce basic sets, e.g. [ID], which conflicts with the use of square brackets to denote XML Information Set properties 1.4.6 XML Information Set Properties. Also, in Z Notation, curly brackets are used to denote set display and set comprehension, e.g. {1, 2, 3}, which conflicts with the use of curly brackets to denote WSDL 2.0 Component Model properties 1.4.7 WSDL 2.0 Component Model Properties. However, the intended meaning of square and curly brackets should be clear from their context and this minor notational conflict should not cause any confusion.

1.4.9 BNF Pseudo-Schemas

Pseudo-schemas are provided for each component, before the description of the component. They use BNF-style conventions for attributes and elements: "?" denotes optionality (i.e. zero or one occurrences), "*" denotes zero or more occurrences, "+" one or more occurrences, "[" and "]" are used to form groups, and "|" represents choice. Attributes are conventionally assigned a value which corresponds to their type, as defined in the normative schema. Elements with simple content are conventionally assigned a value which corresponds to the type of their content, as defined in the normative schema. Pseudo schemas do not include extensibility points for brevity.

<!-- sample pseudo-schema -->
<defined_element
      required_attribute_of_type_string="xs:string"
      optional_attribute_of_type_int="xs:int"? >
  <required_element />
  <optional_element />?
  <one_or_more_of_these_elements />+
  [ <choice_1 /> | <choice_2 /> ]*
</defined_element>

1.4.10 Assertions

Assertions about WSDL 2.0 documents and components that are not enforced by the normative XML schema for WSDL 2.0 are marked in the non-normative version of this specification by a dagger symbol (†) at the end of a sentence. Each assertion has been assigned a unique identifier that consists of a descriptive textual prefix and a unique numeric suffix. The numeric suffixes are assigned sequentially and never reused so there may be gaps in the sequence. The assertion identifiers MAY be used by implementations of this specification for any purpose, e.g. error reporting.

The assertions and their identifiers are summarized in an Assertion Summary Appendix that is included the non-normative version of this specification.

2. Component Model

This section describes the conceptual model of WSDL 2.0 as a set of components with attached properties, which collectively describe a Web service. This model is called the Component Model of WSDL 2.0. A valid WSDL 2.0 component model is a set of WSDL 2.0 components and properties that satisfy all the requirements given in this specification as indicated by keywords whose interpretation is defined by RFC 2119 [IETF RFC 2119].

ComponentModel  [ show all ]  [ hide all ]

A WSDL 2.0 document, and its related documents, defines a set of components that together form an instance of a Component Model. This specification defines the structure and constraints on the components in a valid component model instance.

Let ComponentModel be the set of valid component model instances:

ComponentModel
DescriptionCM
ElementDeclarationCM
TypeDefinitionCM
FeatureCM
PropertyCM
InterfaceCM
InterfaceFaultCM
InterfaceOperationCM
InterfaceMessageReferenceCM
InterfaceFaultReferenceCM
BindingCM
BindingFaultCM
BindingOperationCM
BindingMessageReferenceCM
BindingFaultReferenceCM
ServiceCM
EndpointCM

The definition of ComponentModel is built up from definitions for each of the component types. A component model instance is valid if and only if the constraints on each of the component types are satisfied. The component type definitions are given in the following sections.

Components are typed collections of properties that correspond to different aspects of Web services. Each subsection herein describes a different type of component, its defined properties, and its representation as an XML Infoset [XML Information Set].

Component  [ show all ]  [ hide all ]

Let Component be the union of each of the component types that appear in the WSDL 2.0 component model:

Component ::=
      descriptionDescription|
      elementDeclElementDeclaration|
      typeDefTypeDefinition|
      interfaceInterface|
      interfaceFaultInterfaceFault|
      interfaceOpInterfaceOperation|
      interfaceMessageRefInterfaceMessageReference|
      interfaceFaultRefInterfaceFaultReference|
      featureFeature|
      propertyProperty|
      bindingBinding|
      bindingFaultBindingFault|
      bindingOpBindingOperation|
      bindingMessageRefBindingMessageReference|
      bindingFaultRefBindingFaultReference|
      serviceService|
      endpointEndpoint

The Component type is an example of a Z Notation free type. The structure of a free type is similar to that of a variant record or discriminated union datatype that are found in some common programming languages. Each of the members of this union is formally defined in the following sections.

ID...
ID  [ show all ]  [ hide all ]

When a component property is said to contain another component or a set of other components, the intended meaning is that the component property contains a reference to another component or a set of references to other components. Every component contains an unique identifier that is used to express references.

Let ID be the set of all component identifier values:

[ID]

The ID type is an example of a Z Notation basic set. The structure of a basic set is immaterial. The only relevant aspect of ID is that it contains enough members to uniquely identify each component, and that these identifiers can be compared for equality. These identifiers are similar to XML element ids or object identifiers that are found in common object-oriented programming languages.

Identifier  [ show all ]  [ hide all ]

Every component has an identifier which uniquely identifies it within a component model instance.

Let Identifier be the set of component identifier properties:

  • Let id be the identifier of the component.

Identifier
id : ID
See ID.

The Identifier set is a an example of Z Notation schema. The structure of a Z schema is similar to that of a record or struct datatype that are found in many common programming languages. The fields of an instance of a Z schema are selected using the usual dot notation, e.g. x.id selects the id field of the instance x.

All component properties that contain an ID, except for Identifier, refer to other components. Every ID value that appears in a component reference corresponds to a unique component in the component model with that identifier.

Id...
Id  [ show all ]  [ hide all ]

Let Id map components to their identifiers:

Id : ComponentID
x : Description Id(description(x)) = x.id
x : ElementDeclaration Id(elementDecl(x)) = x.id
x : TypeDefinition Id(typeDef(x)) = x.id
x : Interface Id(interface(x)) = x.id
x : InterfaceFault Id(interfaceFault(x)) = x.id
x : InterfaceOperation Id(interfaceOp(x)) = x.id
x : InterfaceMessageReference Id(interfaceMessageRef(x)) = x.id
x : InterfaceFaultReference Id(interfaceFaultRef(x)) = x.id
x : Feature Id(feature(x)) = x.id
x : Property Id(property(x)) = x.id
x : Binding Id(binding(x)) = x.id
x : BindingFault Id(bindingFault(x)) = x.id
x : BindingOperation Id(bindingOp(x)) = x.id
x : BindingMessageReference Id(bindingMessageRef(x)) = x.id
x : BindingFaultReference Id(bindingFaultRef(x)) = x.id
x : Service Id(service(x)) = x.id
x : Endpoint Id(endpoint(x)) = x.id

The Id function is an example of a Z Notation axiomatic definition. An axiomatic definition declares an object and then characterises it with a set of axioms or logical constraints that it satisfies. In this case, the Id function is constrained by giving its value on each possible type of component, which uniquely defines it.

ComponentModel1  [ show all ]  [ hide all ]

A component model is a set of uniquely identified components that satisfy a set of validity constraints which are described in the following sections.

Let ComponentModel1 be the base set of component models. This set will be further constrained in the following sections:

  • Let components be the set of components in the component model.

  • Let componentIds be the set of identifiers of components in the component model.

ComponentModel1
components :Component
componentIds :ID
x, y : components
      Id(x) = Id(y)x = y
componentIds =x : components Id(x) }
  • No two components have the same identifier.

IdentifierValid  [ show all ]  [ hide all ]

An identifier is valid if it is the identifier of a component in the component model.

Let IdentifierValid express this validity constraint:

IdentifierValid
ComponentModel1
Identifier
idcomponentIds
InterfaceComponents  [ show all ]  [ hide all ]

In order to express the additional contraints on the component model, it is convenient to define the subsets of components of each type and their corresponding subsets of identifiers.

Let InterfaceComponents define the subsets of components that are related to the Interface component:

InterfaceComponents
ComponentModel1
interfaceComps :Interface
interfaceFaultComps :InterfaceFault
interfaceOpComps :InterfaceOperation
interfaceMessageRefComps :InterfaceMessageReference
interfaceFaultRefComps :InterfaceFaultReference
interfaceComps =x : Interface |
      interface(x)components }
interfaceFaultComps =x : InterfaceFault |
      interfaceFault(x)components }
interfaceOpComps =x : InterfaceOperation |
      interfaceOp(x)components }
interfaceMessageRefComps =x : InterfaceMessageReference |
      interfaceMessageRef(x)components }
interfaceFaultRefComps =x : InterfaceFaultReference |
      interfaceFaultRef(x)components }

The definition of InterfaceComponents is an example of Z Notation schema inclusion. In Z schema inclusion all the fields and constraints of the included Z schema, e.g. ComponentModel1 are added to the including Z schema, e.g. InterfaceComponents.

InterfaceComponentIds  [ show all ]  [ hide all ]

Let InterfaceComponentIds define the subsets of component identifiers that are related to the Interface component:

InterfaceComponentIds
InterfaceComponents
interfaceIds :ID
interfaceFaultIds :ID
interfaceOpIds :ID
interfaceMessageRefIds :ID
interfaceFaultRefIds :ID
interfaceIds =x : interfaceComps x.id }
interfaceFaultIds =x : interfaceFaultComps x.id }
interfaceOpIds =x : interfaceOpComps x.id }
interfaceMessageRefIds =x : interfaceMessageRefComps x.id }
interfaceFaultRefIds =x : interfaceFaultRefComps x.id }
BindingComponents  [ show all ]  [ hide all ]

Let BindingComponents define the subsets of components that are related to the Binding component:

BindingComponents
ComponentModel1
bindingComps :Binding
bindingFaultComps :BindingFault
bindingOpComps :BindingOperation
bindingMessageRefComps :BindingMessageReference
bindingFaultRefComps :BindingFaultReference
bindingComps =x : Binding |
      binding(x)components }
bindingFaultComps =x : BindingFault |
      bindingFault(x)components }
bindingOpComps =x : BindingOperation |
      bindingOp(x)components }
bindingMessageRefComps =x : BindingMessageReference |
      bindingMessageRef(x)components }
bindingFaultRefComps =x : BindingFaultReference |
      bindingFaultRef(x)components }
BindingComponentIds  [ show all ]  [ hide all ]

Let BindingComponentIds define the subsets of component identifiers that are related to the Binding component:

BindingComponentIds
BindingComponents
bindingIds :ID
bindingFaultIds :ID
bindingOpIds :ID
bindingMessageRefIds :ID
bindingFaultRefIds :ID
bindingIds =x : bindingComps x.id }
bindingFaultIds =x : bindingFaultComps x.id }
bindingOpIds =x : bindingOpComps x.id }
bindingMessageRefIds =x : bindingMessageRefComps x.id }
bindingFaultRefIds =x : bindingFaultRefComps x.id }
ServiceComponents  [ show all ]  [ hide all ]

Let ServiceComponents define the subsets of components that are related to the Service component:

  • Let serviceComps be the subset of Service components.

  • Let endpointComps be the subset of Endpoint components.

ServiceComponents
ComponentModel1
serviceComps :Service
endpointComps :Endpoint
serviceComps =x : Service |
      service(x)components }
endpointComps =x : Endpoint |
      endpoint(x)components }
ServiceComponentIds  [ show all ]  [ hide all ]

Let ServiceComponentIds define the subsets of component identifiers that are related to the Service component:

  • Let serviceIds be the subset of Service component identifiers.

  • Let endpointIds be the subset of Endpoint component identifiers.

ServiceComponentIds
ServiceComponents
serviceIds :ID
endpointIds :ID
serviceIds =x : serviceComps x.id }
endpointIds =x : endpointComps x.id }
OtherComponents  [ show all ]  [ hide all ]

Let OtherComponents define the subsets of the other component types:

  • Let descriptionComps be the subset of Description components.

  • Let elementDeclComps be the subset of Element Declaration components.

  • Let typeDefComps be the subset of Type Definition components.

  • Let featureComps be the subset of Feature components.

  • Let propertyComps be the subset of Property components.

OtherComponents
ComponentModel1
descriptionComps :Description
elementDeclComps :ElementDeclaration
typeDefComps :TypeDefinition
featureComps :Feature
propertyComps :Property
descriptionComps =x : Description |
      description(x)components }
elementDeclComps =x : ElementDeclaration |
      elementDecl(x)components }
typeDefComps =x : TypeDefinition |
      typeDef(x)components }
featureComps =x : Feature |
      feature(x)components }
propertyComps =x : Property |
      property(x)components }
OtherComponentIds  [ show all ]  [ hide all ]

Let OtherComponentIds define the subsets of other component identifiers:

  • Let descriptionIds be the subset of Description component identifiers.

  • Let elementDeclIds be the subset of Element Declaration component identifiers.

  • Let typeDefIds be the subset of Type Definition Operation component identifiers.

  • Let featureIds be the subset of Feature component identifiers.

  • Let propertyIds be the subset of Property component identifiers.

OtherComponentIds
OtherComponents
descriptionIds :ID
elementDeclIds :ID
typeDefIds :ID
featureIds :ID
propertyIds :ID
descriptionIds =x : descriptionComps x.id }
elementDeclIds =x : elementDeclComps x.id }
typeDefIds =x : typeDefComps x.id }
featureIds =x : featureComps x.id }
propertyIds =x : propertyComps x.id }
ComponentModel2  [ show all ]  [ hide all ]

Let ComponentModel2 be the basic component model, augmented with the definitions of the subsets of each component type and their corresponding identifiers:

ComponentModel2
      InterfaceComponentIds
      BindingComponentIds
      ServiceComponentIds
      OtherComponentIds

The definition of ComponentModel2 is an example of Z Notation schema conjunction. In Z schema conjunction, the resulting Z schema, e.g. ComponentModel2, contains all the fields of the conjoined Z schemas, e.g. InterfaceComponentIds, BindingComponentIds, ServiceComponentIds, and OtherComponentIds, and its constraint is the conjunction (logical and) of their constraints.

Base...
Base  [ show all ]  [ hide all ]

Many of the component types in the component model have a set of Feature components and a set of Property components, in addition to an identifer. It is convenient to group these common fields into a base Z schema that can be included in other component schemas.

Let Base be the common base Z schema for all component types that have an identifier and contain sets of Feature and Property components:

Base
Identifier
Features
Properties
BaseValid  [ show all ]  [ hide all ]

The base properties of a component are valid when the Features and Properties properties are valid:

Let BaseValid be this validity constraint on the base fields of a component:

BaseValid
IdentifierValid
FeaturesValid
PropertiesValid
NestedBase  [ show all ]  [ hide all ]

Nested components have an additional {parent} property.

Let NestedBase be the common base schema for all nested component types:

NestedBase
Base
Parent
See Base, Parent.
NestedBaseValid  [ show all ]  [ hide all ]

The properties of a nested base component are valid when the base properties are valid and the {parent} property is valid.

Let NestedBaseValid be the validity constraints for nested components:

NestedBaseValid
BaseValid
ParentValid

Properties are unordered and unique with respect to the component they are associated with. Individual properties' definitions may constrain their content (e.g., to a typed value, another component, or a set of typed values or components), and components may require the presence of a property to be considered conformant. Such properties are marked as REQUIRED, whereas those that are not required to be present are marked as OPTIONAL. By convention, when specifying the mapping rules from the XML Infoset representation of a component to the component itself, an optional property that is absent in the component in question is described as being “empty”. Unless otherwise specified, when a property is identified as being a collection (a set or a list), its value may be a 0-element (empty) collection. In order to simplify the presentation of the rules that deal with sets of components, for all OPTIONAL properties whose type is a set, the absence of such a property from a component MUST be treated as semantically equivalent to the presence of a property with the same name and whose value is the empty set. In other words, every OPTIONAL set-valued property MUST be assumed to have the empty set as its default value, to be used in case the property is absent.

OPTIONAL  [ show all ]  [ hide all ]

An OPTIONAL simple property type is treated as a set-valued type that contains at most one member. If the property is absent then its value is the empty set. If the property is present then its value is the singleton set that contains the actual value of the property.

Let OPTIONAL[X] be the OPTIONAL values of type X where X is a property type:

[X]
OPTIONAL :(X)
OPTIONAL = {∅}x : X {x} }
  • An optional value of type X is either the empty set or a singleton set that contains one member of X.

For example, OPTIONAL[{True, False}] = {∅, {True}, {False}}.

The definition of OPTIONAL is an example of Z Notation generic definition. A Z generic definition defines an object whose type depends on the types of one or more sets that are given as arguments to the definition. A Z generic definition is similar to a generic, template, or parameterized type that are found in common programming languages.

Component definitions are serializable in XML 1.0 format but are independent of any particular serialization of the component model. Component definitions use a subset (see 2.16 XML Schema 1.0 Simple Types Used in the Component Model) of the simple types defined by the XML Schema 1.0 specification [XML Schema: Datatypes].

In addition to the direct XML Infoset representation described here, the component model allows components external to the Infoset through the mechanisms described in 4. Modularizing WSDL 2.0 descriptions.

A component model can be extracted from a given XML Infoset which conforms to the XML Schema for WSDL 2.0 by recursively mapping Information Items to their identified components, starting with the wsdl:description element information item. This includes the application of the mechanisms described in 4. Modularizing WSDL 2.0 descriptions.

This document does not specify a means of producing an XML Infoset representation from a component model instance. In particular, there are in general many valid ways to modularize a given component model instance into one or more XML Infosets.

2.1 Description

2.1.1 The Description Component

At the abstract level, the Description component is just a container for two categories of components: WSDL 2.0 components and type system components.

WSDL 2.0 components are interfaces, bindings and services. Type system components are element declarations and type definitions.

Type system components describe the constraints on a message's content. By default, these constraints are expressed in terms of the [XML Information Set], i.e. they define the [local name], [namespace name], [children] and [attributes] properties of an element information item. Type systems based upon other data models are generally accommodated by extensions to WSDL 2.0; see 6. Language Extensibility. In the case where they define information equivalent to that of a XML Schema global element declaration, they can be treated as if they were such a declaration.

This specification does not define the behavior of a WSDL 2.0 document that uses multiple schema languages for describing type system components simultaneously.

ElementContentModel  [ show all ]  [ hide all ]

Let ElementContentModel be the set of all models that define the allowable values for the [children] and [attribute] properties of an element information item:

[ElementContentModel]

The detailed structure of ElementContentModel is immaterial for the purposes of this specification. It is can be safely thought of as some superset of the set of all XML Schema complex type definitions.

An Element Declaration component defines the name and content model of an element information item such as that defined by an XML Schema global element declaration. It has a {name} property that is the QName of the element information item and a {system} property that is the namespace IRI of the extension element information items for the type system, e.g. the namespace of XML Schema.

ElementDeclaration  [ show all ]  [ hide all ]

Let ElementDeclaration be the type of Element Declaration components:

  • Let name be the QName defined by the [local name] and [namespace name] properties of the element information item.

  • Let system be the namespace IRI of the type system.

  • Let elementContentModel be the element content model that constrains the allowable contents of the [children] and [attribute] properties of the element information item.

ElementDeclaration
Identifier
name : QName
system : AbsoluteURI
elementContentModel : ElementContentModel
ElementDeclarationCM  [ show all ]  [ hide all ]

Each Element Declaration component is uniquely identified by the combination of its {name} and {system} properties within the component model.

Let ElementDeclarationCM express this constraint:

ElementDeclarationCM
ComponentModel2
x, y : elementDeclComps |
      x.name = y.name
      x.system = y.system
            x = y

A Type Definition component defines the content model of an element information item such as that defined by an XML Schema global type definition. It has a {name} property that is the QName of the type and a {system} property that is the namespace IRI of the extension element information items for the type system, e.g. the namespace of XML Schema.

TypeDefinition  [ show all ]  [ hide all ]

Let TypeDefinition be the type of the Type Definition component:

  • Let name be the QName of the type definition.

  • Let system be the namespace IRI of the type system.

  • Let elementContentModel be the element content model that constrains the allowable contents of the [children] and [attribute] properties of the element information item described by the type definition.

TypeDefinition
Identifier
name : QName
system : AbsoluteURI
elementContentModel : ElementContentModel
TypeDefinitionCM  [ show all ]  [ hide all ]

Each Type Definition component is uniquely identified by the combination of its {name} and {system} properties within the component model.

Let TypeDefinitionCM express this constraint:

TypeDefinitionCM
ComponentModel2
x, y : typeDefComps |
      x.name = y.name
      x.system = y.system
            x = y

Interface, Binding, Service, Element Declaration, and Type Definition components are directly contained in the Description component and are referred to as top-level components. The top-level WSDL 2.0 components contain other components, e.g. Interface Operation and Endpoint, which are referred to as nested components. Nested components may contain other nested components. The component that contains a nested component is referred to as the parent of the nested components. Nested components have a {parent} property that is a reference to their parent component.

TopLevelComponent  [ show all ]  [ hide all ]

Let TopLevelComponent be the set of all top-level components:

TopLevelComponent ==
      ranelementDecl
      rantypeDef
      raninterface
      ranbinding
      ranservice
Name...
Name  [ show all ]  [ hide all ]

Let Name map a top-level component to its QName {name} property:

Name : TopLevelComponentQName
x : ElementDeclaration
      Name(elementDecl(x)) = x.name
x : TypeDefinition
      Name(typeDef(x)) = x.name
x : Interface
      Name(interface(x)) = x.name
x : Binding
      Name(binding(x)) = x.name
x : Service
      Name(service(x)) = x.name
Parent  [ show all ]  [ hide all ]

Let Parent represent the {parent} property of a nested component:

Parent
Identifier
parent : ID
ParentValid  [ show all ]  [ hide all ]

The parent of a nested component in the component model MUST also be in the component model. No component is its own parent.

Let ParentValid represent these validity constraints:

ParentValid
ComponentModel1
Parent
parentcomponentIds
parentid
NestedComponent  [ show all ]  [ hide all ]

Let NestedComponent be the set of all nested components:

NestedComponent ==
      raninterfaceFault
      raninterfaceOp
      raninterfaceMessageRef
      raninterfaceFaultRef
      ranbindingFault
      ranbindingOp
      ranbindingMessageRef
      ranbindingFaultRef
      ranendpoint
      ranfeature
      ranproperty
ParentId  [ show all ]  [ hide all ]

Let ParentId map a nested component to its parent component identifier:

ParentId : NestedComponentID
x : InterfaceFault
      ParentId(interfaceFault(x)) = x.parent
x : InterfaceOperation
      ParentId(interfaceOp(x)) = x.parent
x : InterfaceMessageReference
      ParentId(interfaceMessageRef(x)) = x.parent
x : InterfaceFaultReference
      ParentId(interfaceFaultRef(x)) = x.parent
x : BindingFault
      ParentId(bindingFault(x)) = x.parent
x : BindingOperation
      ParentId(bindingOp(x)) = x.parent
x : BindingMessageReference
      ParentId(bindingMessageRef(x)) = x.parent
x : BindingFaultReference
      ParentId(bindingFaultRef(x)) = x.parent
x : Endpoint
      ParentId(endpoint(x)) = x.parent
x : Feature
      ParentId(feature(x)) = x.parent
x : Property
      ParentId(property(x)) = x.parent

The properties of the Description component are as follows:

Description  [ show all ]  [ hide all ]

Let Description be the set of all Description components:

Description
Identifier
interfaces :ID
bindings :ID
services :ID
elementDeclarations :ID
typeDefinitions :ID
See ID.
DescriptionKey  [ show all ]  [ hide all ]

The component model contains a unique Description component.

Let DescriptionKey express this constraint on the Description component:

  • Let descriptionComp be the unique Description component.

DescriptionKey
ComponentModel2
descriptionComp : Description
descriptionComps = {descriptionComp}
  • The component model contains a unique Description component.

DescriptionCM  [ show all ]  [ hide all ]

Each component refered to by the properties of the Description component must exist in the component model.

Let DescriptionCM express these referential integrity constraints on the Description component:

DescriptionCM
DescriptionKey
descriptionComp.interfaces = interfaceIds
descriptionComp.bindings = bindingIds
descriptionComp.services = serviceIds
descriptionComp.elementDeclarations = elementDeclIds
descriptionComp.typeDefinitions = typeDefIds

The set of top-level components contained in the Description component associated with an initial WSDL 2.0 document consists of the components defined in the initial document and the components associated with the documents that the initial document includes or imports. The component model makes no distinction between the components that are defined in the initial document versus those that are defined in the included or imported documents. However, any WSDL 2.0 document that contains component definitions that refer by QName to WSDL 2.0 components that belong to a different namespace MUST contain a wsdl:import element information item for that namespace (see 4.2 Importing Descriptions ). Furthermore, all QName references, whether to the same or to different namespaces MUST resolve to components (see 2.19 QName resolution ).

In addition to WSDL 2.0 components and type system components, additional extension components MAY be added via extensibility 6. Language Extensibility. Further, additional properties to WSDL 2.0 and type system components MAY also be added via extensibility.

2.1.2 XML Representation of Description Component

<description
      targetNamespace="xs:anyURI" >
  <documentation />*
  [ <import /> | <include /> ]*
  <types />?
  [ <interface /> | <binding /> | <service /> ]*
</description>

WSDL 2.0 definitions are represented in XML by one or more WSDL 2.0 Information Sets (Infosets), that is one or more description element information items. A WSDL 2.0 Infoset contains representations for a collection of WSDL 2.0 components which share a common target namespace. A WSDL 2.0 Infoset which contains one or more wsdl:import element information items 4.2 Importing Descriptions corresponds to a collection with components drawn from multiple target namespaces.

The components directly defined or included within a Description component are said to belong to the same target namespace. The target namespace therefore groups a set of related component definitions and represents an unambiguous name for the intended semantics of the collection of components. The value of the targetNamespace attribute information item SHOULD be dereferenceable. It SHOULD resolve to a human or machine processable document that directly or indirectly defines the intended semantics of those components. It MAY resolve to a WSDL 2.0 document which provides service description information for that namespace.

If a WSDL 2.0 document is split into multiple WSDL 2.0 documents (which may be combined as needed via 4.1 Including Descriptions), then the targetNamespace attribute information item SHOULD resolve to a master WSDL 2.0 document that includes all the WSDL 2.0 documents needed for that service description. This approach enables the WSDL 2.0 component designator fragment identifiers to be properly resolved.

Imported components have different target namespace values from the WSDL 2.0 document that is importing them. Thus importing is the mechanism to use components from one namespace in definition of components from another namespace.

Each WSDL 2.0 or type system component MUST be uniquely identified by its qualified name. That is, if two distinct components of the same kind ( Interface, Binding, etc.) are in the same target namespace, then their QNames MUST be unique. However, different kinds of components (e.g., an Interface component and a Binding component) MAY have the same QName. Thus, QNames of components must be unique within the space of those components in a given target namespace.

The description element information item has the following Infoset properties:

  • A [local name] of description .

  • A [namespace name] of "http://www.w3.org/2006/01/wsdl".

  • One or more attribute information items amongst its [attributes] as follows:

    • A REQUIRED targetNamespace attribute information item as described below in 2.1.2.1 targetNamespace attribute information item.

    • Zero or more namespace qualified attribute information items whose [namespace name] is NOT "http://www.w3.org/2006/01/wsdl".

  • Zero or more element information items amongst its [children], in order as follows:

    1. Zero or more documentation element information items (see 5. Documentation).

    2. Zero or more element information items from among the following, in any order:

      • Zero or more include element information items (see 4.1 Including Descriptions)

      • Zero or more import element information items (see 4.2 Importing Descriptions)

      • Zero or more namespace-qualified element information items whose [namespace name] is NOT "http://www.w3.org/2006/01/wsdl".

    3. An OPTIONAL types element information item (see 3. Types).

    4. Zero or more element information items from among the following, in any order:

2.1.2.1 targetNamespace attribute information item

The targetNamespace attribute information item defines the namespace affiliation of top-level components defined in this description element information item. Interface, Binding and Service are top-level components.

The targetNamespace attribute information item has the following Infoset properties:

  • A [local name] of targetNamespace

  • A [namespace name] which has no value

The type of the targetNamespace attribute information item is xs:anyURI. Its value MUST be an absolute IRI (see [IETF RFC 3987]) and should be dereferenceable.

2.1.3 Mapping Description's XML Representation to Component Properties

The mapping from the XML Representation of the description element information item (see 2.1.2 XML Representation of Description Component) to the properties of the Description component is described in Table 2-1.


Table 2-1. Mapping from XML Representation to Description Component Properties
Property Value
{interfaces} The set of Interface components corresponding to all the interface element information items in the [children] of the description element information item, if any, plus any included (via wsdl:include ) or imported (via wsdl:import ) Interface components (see 4. Modularizing WSDL 2.0 descriptions).
{bindings} The set of Binding components corresponding to all the binding element information items in the [children] of the description element information item, if any, plus any included (via wsdl:include ) or imported (via wsdl:import ) Binding components (see 4. Modularizing WSDL 2.0 descriptions).
{services} The set of Service components corresponding to all the service element information items in the [children] of the description element information item, if any, plus any included (via wsdl:include ) or imported (via wsdl:import ) Service components (see 4. Modularizing WSDL 2.0 descriptions).
{element declarations} The set of Element Declaration components corresponding to all the element declarations defined as descendants of the types element information item, if any, plus any included (via xs:include ) or imported (via xs:import ) Element Declaration components. At a minimum this will include all the global element declarations defined by XML Schema element element information items. It MAY also include any declarations from some other type system which describes the [local name], [namespace name], [attributes] and [children] properties of an element information item.
{type definitions} The set of Type Definition components corresponding to all the type definitions defined as descendants of the types element information item, if any, plus any (via xs:include ) or imported (via xs:import ) Type Definition components. At a minimum this will include all the global type definitions defined by XML Schema simpleType and complexType element information items. It MAY also include any definitions from some other type system which describes the [attributes] and [children] properties of an element information item. It is an error if there are multiple type definitions for each QName.

2.2 Interface

2.2.1 The Interface Component

An Interface component describes sequences of messages that a service sends and/or receives. It does this by grouping related messages into operations. An operation is a sequence of input and output messages, and an interface is a set of operations.

An interface can optionally extend one or more other interfaces. To avoid circular definitions, an interface MUST NOT appear as an element of the set of interfaces it extends, either directly or indirectly. The set of operations available in an interface includes all the operations defined by the interfaces it extends, along with any operations it directly defines. The operations directly defined on an interface are referred to as the declared operations of the interface. In the process, operation components that are equivalent per 2.17 Equivalence of Components are treated as one. The interface extension mechanism behaves in a similar way for all other components that can be defined inside an interface, namely Interface Fault, Feature and Property components.

Interfaces are named constructs and can be referred to by QName (see 2.19 QName resolution). For instance, Binding components refer to interfaces in this way.

The properties of the Interface component are as follows:

Interface  [ show all ]  [ hide all ]

Let Interface be the set of all Interface components:

  • Let allExtendedInterfaces be the set off all interfaces that are extended directly or indirectly by this interface.

  • Let allInterfaceFaults be the set of all faults that are directly or indirectly on this interface.

  • Let allInterfaceOperations be the set of all operations that are directly or indirectly on this interface.

Interface
Base
name : QName
extendedInterfaces :ID
interfaceFaults :ID
interfaceOperations :ID
allExtendedInterfaces :ID
allInterfaceFaults :ID
allInterfaceOperations :ID
extendedInterfacesallExtendedInterfaces
interfaceFaultsallInterfaceFaults
interfaceOperationsallInterfaceOperations
See Base, QName, ID.
InterfaceRI  [ show all ]  [ hide all ]

Each component referenced by an Interface component must exist in the component model.

Let InterfaceRI express the referential integrity constraints on the Interface component:

InterfaceRI
ComponentModel2
Interface |θInterfaceinterfaceComps
      BaseValid
      extendedInterfacesinterfaceIds
      interfaceFaultsinterfaceFaultIds
      interfaceOperationsinterfaceOpIds

This Z schema introduces some additional notation. The universal quantifier Interface declares each field that is part of the Interface schema as an in-scope variable and constrains them to satify the rules for Interface. The expression θInterface assembles these variables into Interface record or struct. The expression θInterfaceinterfaceComps constrains the Interface record to exist in the component model.

For each Interface component in the {interfaces} property of a Description component, the {name} property MUST be unique.

InterfaceKey  [ show all ]  [ hide all ]

Let InterfaceKey express the QName uniqueness constraint on the Interface component:

InterfaceKey
ComponentModel2
x, y : interfaceComps |
      x.name = y.name x = y
InterfaceParent  [ show all ]  [ hide all ]

An Interface component contains nested Interface Operation and Interface Fault components. These components MUST have the Interface component as their parent.

Let InterfaceParent express the constraints on the {parent} properties of the nested components of an Interface component:

InterfaceParent
ComponentModel2
i : interfaceComps;
      if : interfaceFaultComps;
      io : interfaceOpComps
      if.idi.interfaceFaultsif.parent = i.id
      io.idi.interfaceOperationsio.parent = i.id
InterfaceAllExtendedInterfaces  [ show all ]  [ hide all ]

The set of all extended interfaces that are available on an Interface component consist of those that are declared on the component and those that are available on its extended interfaces.

Let InterfaceAllExtendedInterfaces express this definition:

InterfaceAllExtendedInterfaces
ComponentModel2
i : interfaceComps
      i.allExtendedInterfaces = i.extendedInterfaces
            { x : interfaceComps; y : ID |
                  x.idi.extendedInterfaces
                  yx.allExtendedInterfaces y }
  • An Interface component directly or indirectly extends an Interface component if it directly extends it, or if an Interface component that it directly extends, directly or indirectly extends it.

InterfaceExtendsAcyclic  [ show all ]  [ hide all ]

An Interface component MUST NOT directly or indirectly extend itself.

Let InterfaceExtendsAcyclic express this constraint:

InterfaceExtendsAcyclic
ComponentModel2
i : interfaceComps
      i.idi.allExtendedInterfaces
InterfaceAllInterfaceOperations  [ show all ]  [ hide all ]

The set of all Interface Operation components that are available on an Interface component consist of those that are contained by the Interface component and those that are available on Interface components that it directly or indirectly extends.

Let InterfaceAllInterfaceOperations express this definition:

InterfaceAllInterfaceOperations
ComponentModel2
i : interfaceComps
      i.allInterfaceOperations = i.interfaceOperations
            { x : interfaceComps; y : ID |
                  x.idi.allExtendedInterfaces
                  yx.interfaceOperations y }
InterfaceAllInterfaceFaults  [ show all ]  [ hide all ]

The set of all Interface Operation components that are available on an Interface component consist of those that are contained by the Interface component and those that are available on Interface components that it directly or indirectly extends.

Let InterfaceAllInterfaceFaults express this definition:

InterfaceAllInterfaceFaults
ComponentModel2
i : interfaceComps
      i.allInterfaceFaults = i.interfaceFaults
            { x : interfaceComps; y : ID |
                  x.idi.allExtendedInterfaces
                  yx.interfaceFaults y }
InterfaceCM  [ show all ]  [ hide all ]

Let InterfaceCM be the conjunction of all the component model constraints on Interface components.

InterfaceCM
      InterfaceRI
      InterfaceKey
      InterfaceParent
      InterfaceAllExtendedInterfaces
      InterfaceExtendsAcyclic
      InterfaceAllInterfaceOperations
      InterfaceAllInterfaceFaults

2.2.2 XML Representation of Interface Component

<description>
  <interface
        name="xs:NCName" 
        extends="list of xs:QName"?
        styleDefault="list of xs:anyURI"? >
    <documentation />*
    [ <fault /> | <operation /> | <feature /> | <property /> ]*
  </interface>
</description>

The XML representation for an Interface component is an element information item with the following Infoset properties:

2.2.2.1 name attribute information item with interface [owner element]

The name attribute information item together with the targetNamespace attribute information item of the [parent] description element information item forms the QName of the interface.

The name attribute information item has the following Infoset properties:

  • A [local name] of name

  • A [namespace name] which has no value

The type of the name attribute information item is xs:NCName.

2.2.2.2 extends attribute information item

The extends attribute information item lists the interfaces that this interface derives from.

The extends attribute information item has the following Infoset properties:

  • A [local name] of extends

  • A [namespace name] which has no value

The type of the extends attribute information item is a list of xs:QName.

2.2.2.3 styleDefault attribute information item

The styleDefault attribute information item indicates the default style (see 2.4.1.2 Operation Style) used to construct the {element declaration} properties of {interface message references} of all operations contained within the [owner element] interface .

The styleDefault attribute information item has the following Infoset properties:

  • A [local name] of styleDefault.

  • A [namespace name] which has no value.

The type of the styleDefault attribute information item is list of xs:anyURI. Its value, if present, MUST contain absolute IRIs (see [IETF RFC 3987]).

2.2.3 Mapping Interface's XML Representation to Component Properties

The mapping from the XML Representation of the interface element information item (see 2.2.2 XML Representation of Interface Component) to the properties of the Interface component is as described in Table 2-2.


Table 2-2. Mapping from XML Representation to Interface Component Properties
Property Value
{name} The QName whose local name is actual value of the name attribute information item and whose namespace name is the actual value of the targetNamespace attribute information item of the [parent] description element information item
{extended interfaces} The set of Interface components resolved to by the values in the extends attribute information item, if any (see 2.19 QName resolution).
{interface faults} The set of Interface Fault components corresponding to the fault element information items in [children], if any.
{interface operations} The set of Interface Operation components corresponding to the operation element information items in [children], if any.
{features} The set of Feature components corresponding to the feature element information items in [children], if any.
{properties} The set of Property components corresponding to the property element information items in [children], if any.

Recall that, per 2.2.1 The Interface Component, the Interface components in the {extended interfaces} property of a given Interface component MUST NOT contain that Interface component in any of their {extended interfaces} properties, that is to say, recursive extension of interfaces is disallowed.

2.3 Interface Fault

2.3.1 The Interface Fault Component

A fault is an event that occurs during the execution of a message exchange that disrupts the normal flow of messages.

A fault is typically raised when a party is unable to communicate an error condition inside the normal message flow, or a party wishes to terminate a message exchange. A fault message may be used to communicate out of band information such as the reason for the error, the origin of the fault, as well as other informal diagnostics such as a program stack trace.

An Interface Fault component describes a fault that MAY occur during invocation of an operation of the interface. The Interface Fault component declares an abstract fault by naming it and indicating the contents of the fault message. When and how the fault message flows is indicated by the Interface Operation component.

The Interface Fault component provides a clear mechanism to name and describe the set of faults an interface may generate. This allows operations to easily identify the individual faults they may generate by name. This mechanism allows the ready identification of the same fault occurring across multiple operations and referenced in multiple bindings as well as reducing duplication of description for an individual fault.

Faults other than the ones described in the Interface component may also be generated at run-time, i.e. faults are an open set. The Interface component describes faults that have application level semantics, i.e. that the client or service is expected to handle, and potentially recover from, as part of the application processing logic. For example, an Interface component that accepts a credit card number may describe faults that indicate the credit card number is invalid, has been reported stolen, or has expired. The Interface component does not describe general system faults such as network failures, out of memory conditions, out of disk space conditions, invalid message formats, etc., although these faults may be generated as part of the message exchange. Such general system faults can reasonably be expected to occur in any message exchange and explicitly describing them in an Interface component is therefore uninformative.

The properties of the Interface Fault component are as follows:

InterfaceFault  [ show all ]  [ hide all ]

Let InterfaceFault be the set of all Interface Fault components:

InterfaceFault
NestedBase
name : QName
elementDeclaration : OPTIONAL[ID]
InterfaceFaultRI  [ show all ]  [ hide all ]

Each component referenced by an Interface Fault component must exist in the component model.

Let InterfaceFaultRI express the referential integrity constraints on the Interface Fault component:

InterfaceFaultRI
ComponentModel2
InterfaceFault |θInterfaceFaultinterfaceFaultComps
      NestedBaseValid
      elementDeclarationelementDeclIds

For each Interface Fault component in the {interface faults} property of an Interface component, the {name} property must be unique.

Interface Fault components are uniquely identified by the the QName of the enclosing Interface component and QName of the Interface Fault component itself.

InterfaceFaultKey  [ show all ]  [ hide all ]

Let InterfaceFaultKey express the QName uniqueness constraint on the Interface Fault component:

InterfaceFaultKey
ComponentModel2
x, y : interfaceFaultComps |
      x.parent = y.parent
      x.name = y.name x = y

Note:

Despite having a {name} property, Interface Fault components cannot be identified solely by their QName. Indeed, two Interface components whose {name} property value has the same namespace name, but different local names, can contain Interface Fault components with the same {name} property value. Thus, the {name} property of Interface Fault component is not sufficient to form the unique identity of an Interface Fault component. A method for uniquely identifying components is defined in A.2 Fragment Identifiers . See A.2.5 The Interface Fault Component for the definition of the fragment identifier for the Interface Fault component.

In cases where, due to an interface extending one or more other interfaces, two or more Interface Fault components have the same value for their {name} property, then the component models of those Interface Fault components MUST be equivalent (see 2.17 Equivalence of Components ). If the Interface Fault components are equivalent then they are considered to collapse into a single component. It is an error if two Interface Fault components that are available in the same Interface component have the same value for their {name} properties but are not equivalent.

InterfaceFaultNameUnique  [ show all ]  [ hide all ]

Let InterfaceFaultNameUnique express the uniqueness constraint on the {name} property of an Interface Fault component among all the Interface Fault components available in an Interface component:

InterfaceFaultNameUnique
ComponentModel2
i : interfaceComps;
      x, y : interfaceFaultComps |
      x.idi.allInterfaceFaults
      y.idi.allInterfaceFaults
      x.name = y.name x = y

Note that, due to the above rules, if two interfaces that have the same value for the namespace name of their {name} property also have one or more faults that have the same value for their {name} property then those two interfaces cannot both form part of the derivation chain of a derived interface unless those faults are the same fault.

Note:

For the above reason, it is considered good practice to ensure, where necessary, that the local name of the {name} property of Interface Fault components within a namespace are unique, thus allowing such derivation to occur without inadvertent error.

If a type system NOT based on the XML Infoset [XML Information Set] is in use (as considered in 3.2 Using Other Schema Languages) then additional properties would need to be added to the Interface Fault component (along with extensibility attributes to its XML representation) to allow associating such message types with the message reference.

InterfaceFaultCM  [ show all ]  [ hide all ]

Let InterfaceFaultCM be the conjunction of all the component model constraints on Interface Fault components.

InterfaceFaultCM
      InterfaceFaultRI
      InterfaceFaultKey
      InterfaceFaultNameUnique

2.3.2 XML Representation of Interface Fault Component

<description>
  <interface>
    <fault
          name="xs:NCName" 
          element="xs:QName"? >
      <documentation />*
      [ <feature /> | <property /> ]*
    </fault>
  </interface>
</description>

The XML representation for an Interface Fault component is an element information item with the following Infoset properties:

2.3.2.1 name attribute information item with fault [owner element]

The name attribute information item identifies a given fault element information item inside a given interface element information item.

The name attribute information item has the following Infoset properties:

  • A [local name] of name

  • A [namespace name] which has no value

The type of the name attribute information item is xs:NCName.

2.3.2.2 element attribute information item with fault [owner element]

The element attribute information item refers, by QName, to an Element Declaration component.

The element attribute information item has the following Infoset properties:

  • A [local name] of element .

  • A [namespace name] which has no value.

The type of the element attribute information item is xs:QName.

2.3.3 Mapping Interface Fault's XML Representation to Component Properties

The mapping from the XML Representation of the fault element information item (see 2.3.2 XML Representation of Interface Fault Component) to the properties of the Interface Fault component is as described in Table 2-3.


Table 2-3. Mapping from XML Representation to Interface Fault Component Properties
Property Value
{name} The QName whose local name is the actual value of the name attribute information item. and whose namespace name is the actual value of the targetNamespace attribute information item of the [parent] description element information item of the [parent] interface element information item.
{element declaration} The Element Declaration component from the {element declarations} property of the Description component resolved to by the value of the element attribute information item if present (see 2.19 QName resolution), otherwise empty. It is an error for the element attribute information item to have a value and for it to not resolve to an Element Declaration component from the {element declarations} property of the Description component.
{features} The set of Feature components corresponding to the feature element information items in [children], if any.
{properties} The set of Property components corresponding to the property element information items in [children], if any.
{parent} The Interface component corresponding to the interface element information item in [parent].

2.4 Interface Operation

2.4.1 The Interface Operation Component

An Interface Operation component describes an operation that a given interface supports. An operation is an interaction with the service consisting of a set of (ordinary and fault) messages exchanged between the service and the other parties involved in the interaction. The sequencing and cardinality of the messages involved in a particular interaction is governed by the message exchange pattern used by the operation (see {message exchange pattern} property).

A message exchange pattern defines placeholders for messages, the participants in the pattern (i.e., the sources and sinks of the messages), and the cardinality and sequencing of messages exchanged by the participants. The message placeholders are associated with specific message types by the operation that uses the pattern by means of message and fault references (see {interface message references} and {interface fault references} properties). The service whose operation is using the pattern becomes one of the participants of the pattern. This specification does not define a machine understandable language for defining message exchange patterns, nor does it define any specific patterns. The companion specification, [WSDL 2.0 Adjuncts] defines a set of such patterns and defines identifying IRIs any of which MAY be used as the value of the {message exchange pattern} property.

The properties of the Interface Operation component are as follows:

InterfaceOperation  [ show all ]  [ hide all ]

Let InterfaceOperation be the set of all Interface Operation components:

InterfaceOperation
NestedBase
name : QName
messageExchangePattern : AbsoluteURI
interfaceMessageReferences :ID
interfaceFaultReferences :ID
style :AbsoluteURI
InterfaceOperationRI  [ show all ]  [ hide all ]

Each component referenced by an Interface Operation component must exist in the component model.

Let InterfaceOperationRI express the referential integrity constraints on the Interface Operation component:

InterfaceOperationRI
ComponentModel2
InterfaceOperation |θInterfaceOperationinterfaceOpComps
      NestedBaseValid
      interfaceMessageReferencesinterfaceMessageRefIds
      interfaceFaultReferencesinterfaceFaultRefIds

For each Interface Operation component in the {interface operations} property of an Interface component, the {name} property MUST be unique.

Interface Operation components are uniquely identified by the the QName of the enclosing Interface component and QName of the Interface Operation component itself.

InterfaceOperationKey  [ show all ]  [ hide all ]

Let InterfaceOperationKey express the QName uniqueness constraint on the Interface Operation component:

InterfaceOperationKey
ComponentModel2
x, y : interfaceOpComps |
      x.parent = y.parent
      x.name = y.name x = y

Note:

Despite having a {name} property, Interface Operation components cannot be identified solely by their QName. Indeed, two Interface components whose {name} property value has the same namespace name, but different local names, can contain Interface Operation components with the same {name} property value. Thus, the {name} property of Interface Operation components is not sufficient to form the unique identity of an Interface Operation component. A method for uniquely identifying components is defined in A.2 Fragment Identifiers . See A.2.6 The Interface Operation Component for the definition of the fragment identifier for the Interface Operation component.

In cases where, due to an interface extending one or more other interfaces, two or more Interface Operation components have the same value for their {name} property, then the component models of those Interface Operation components MUST be equivalent (see 2.17 Equivalence of Components). If the Interface Operation components are equivalent then they are considered to collapse into a single component. It is an error if two Interface Operation components have the same value for their {name} property but are not equivalent.

InterfaceOperationNameUnique  [ show all ]  [ hide all ]

Let InterfaceOperationNameUnique express the uniqueness constraint on the {name} property of an Interface Operation component among all the Interface Operation components available in an Interface component:

InterfaceOperationNameUnique
ComponentModel2
i : interfaceComps;
      x, y : interfaceOpComps |
      x.idi.allInterfaceOperations
      y.idi.allInterfaceOperations
      x.name = y.name x = y
  • No two Interface Operation components among all those available in the same Interface component have the same {name} property.

Note that, due to the above rules, if two interfaces that have the same value for the namespace name of their {name} property also have one or more operations that have the same value for their {name} property then those two interfaces cannot both form part of the derivation chain of a derived interface unless those operations are the same operation.

Note:

For the above reason, it is considered good practice to ensure, where necessary, that the {name} property of Interface Operation components within a namespace are unique, thus allowing such derivation to occur without inadvertent error.

More than one Interface Fault Reference component in the {interface fault references} property of an Interface Operation component may refer to the same message label. In that case, the listed fault types define alternative fault messages. This allows one to indicate that there is more than one type of fault that is related to that message.

InterfaceOperationParent  [ show all ]  [ hide all ]

An Interface Operation component contains nested Interface Message Reference and Interface Fault Reference components. These components MUST have the Interface Operation component as their parent.

Let InterfaceOperationParent express the constraints on the {parent} properties of the nested components of an Interface Operation component:

InterfaceOperationParent
ComponentModel2
io : interfaceOpComps;
      ifr : interfaceFaultRefComps;
      imr : interfaceMessageRefComps
      ifr.idio.interfaceFaultReferencesifr.parent = io.id
      imr.idio.interfaceMessageReferencesimr.parent = io.id
InterfaceOperationCM  [ show all ]  [ hide all ]

Let InterfaceOperationCM be the conjunction of all the component model constraints on Interface Operation components.

InterfaceOperationCM
      InterfaceOperationRI
      InterfaceOperationKey
      InterfaceOperationParent
      InterfaceOperationNameUnique
2.4.1.1 Message Exchange Pattern

This section describes some aspects of message exchange patterns in more detail. Refer to the WSDL Version 2.0 Part 2: Adjuncts specification [WSDL 2.0 Adjuncts] for a complete discussion of the semantics of message exchange patterns in general as well as the definitions of the message exchange patterns that are predefined by WSDL 2.0.

A placeholder message is a template for an actual message as described by an Interface Message Reference component. Although a placeholder message is not itself a component, it is useful to regard it as having both a {message label} and a {direction} property which define the values of the actual Interface Message Reference component that corresponds to it. A placeholder message is also associated with some node that exchanges the message with the service. Furthermore, a placeholder message may be designated as optional in the exchange.

Node...
Node  [ show all ]  [ hide all ]

Let Node be the set of all nodes that participate in message exchanges:

[Node]
PlaceholderMessage  [ show all ]  [ hide all ]

Let PlaceholderMessage be the set of all placeholder messages:

PlaceholderMessage
messageLabel : NCName
direction : Direction
node : Node
optional : Boolean

A fault propagation ruleset specifies the relation between the Interface Fault Reference and Interface Message Reference components of an Interface Operation component. The WSDL Version 2.0 Part 2: Adjuncts specification [WSDL 2.0 Adjuncts] defines three fault propagation rulesets which we'll refer to as fault-replaces-message , message-triggers-fault , and no-faults . These fault propagation rulesets are used by the predefined message exchange patterns. Other message exchange patterns may define additional fault propagation rulesets.

FaultPropagationRuleset  [ show all ]  [ hide all ]

Let FaultPropagationRuleset be the set of all fault propagation rulesets:

[FaultPropagationRuleset]

Let the predefined fault propation rulesets be as follows:

messageTriggersFault : FaultPropagationRuleset
faultReplacesMessage : FaultPropagationRuleset
noFaults : FaultPropagationRuleset
messageTriggersFaultfaultReplacesMessage
faultReplacesMessagenoFaults
noFaultsmessageTriggersFault

A message exchange pattern is a template for the exchange of one or more messages, and their associated faults, between the service and one or more other nodes as described by an Interface Operation component. The service and the other nodes are referred to as the participants in the exchange. A message exchange pattern consists of a sequence of one or more placeholder messages. Each placeholder message within this sequence is uniquely identified by its {message label} property. A message exchange pattern is uniquely identified by an absolute IRI which is used as the value of the {message exchange pattern} property of the Interface Operation component, and it specifies the fault propagation ruleset that its faults obey.

MessageExchangePattern  [ show all ]  [ hide all ]

Let MessageExchangePattern be the set of all message exchange patterns:

MessageExchangePattern
messageExchangePattern : AbsoluteURI
placeholderMessages :seqPlaceholderMessage
faultPropagationRuleset : FaultPropagationRuleset
placeholderMessages
i1, i2 :ℤ; p1, p2 : PlaceholderMessage |
      i1p1placeholderMessages
      i2p2placeholderMessages
      p1.messageLabel = p2.messageLabeli1 = i2
  • Each message exchange pattern has at least one placeholder message.

  • Each placeholder message in a message exchange pattern is uniquely identified by its message label.

2.4.1.2 Operation Style

An operation style specifies additional information about an operation. For example, an operation style may define structural constraints on the element declarations of the interface message reference or interface fault components used by the operation. This additional information in no way affects the messages and faults exchanged with the service and it may therefore be safely ignored in that context. However, the additional information may be used for other purposes, for example, improved code generation. The {style} property of the Interface Operation component contains a set of zero or more IRIs that identify operation styles. An Interface Operation component MUST satisfy the specification defined by each operation style identified by its {style} property. If no Interface Operation component can simultaneously satisfy all of the styles, the document is invalid.

If the {style} property of an Interface Operation component does have a value, then that value (a set of IRIs) specifies the rules that were used to define the element declarations (or other properties that define the message and fault contents; see 3.2 Using Other Schema Languages) of the Interface Message Reference or Interface Fault components used by the operation. Although a given operation style has the ability to constrain all input and output messages and faults of an operation, it MAY choose to constrain any combination thereof, e.g. only the messages, or only the inputs.

Please refer to the WSDL Version 2.0 Part 2: Adjuncts specification [WSDL 2.0 Adjuncts] for particular operation style definitions.

2.4.2 XML Representation of Interface Operation Component

<description>
  <interface>
    <operation
          name="xs:NCName" 
          pattern="xs:anyURI"
          style="list of xs:anyURI"? >
      <documentation />*
      [ <feature /> | <property /> | 
        [ <input /> | <output /> | <infault /> | <outfault /> ]+
      ]*
    </operation>
  </interface>
</description>

The XML representation for an Interface Operation component is an element information item with the following Infoset properties:

2.4.2.1 name attribute information item with operation [owner element]

The name attribute information item identifies a given operation element information item inside a given interface element information item.

The name attribute information item has the following Infoset properties:

  • A [local name] of name

  • A [namespace name] which has no value

The type of the name attribute information item is xs:NCName.

2.4.2.2 pattern attribute information item with operation [owner element]

The pattern attribute information item identifies the message exchange pattern a given operation uses.

The pattern attribute information item has the following Infoset properties:

  • A [local name] of pattern

  • A [namespace name] which has no value

The type of the pattern attribute information item is xs:anyURI. Its value MUST be an absolute IRI (see [IETF RFC 3987]).

2.4.2.3 style attribute information item with operation [owner element]

The style attribute information item indicates the rules that were used to construct the {element declaration} properties of the Interface Message Reference components which are members of the {interface message references} property of the [owner element] operation.

The style attribute information item has the following Infoset properties:

  • A [local name] of style

  • A [namespace name] which has no value

The type of the style attribute information item is list of xs:anyURI. Its value MUST be an absolute IRI (see [IETF RFC 3987]).

2.4.3 Mapping Interface Operation's XML Representation to Component Properties

The mapping from the XML Representation of the operation element information item (see 2.4.2 XML Representation of Interface Operation Component) to the properties of the Interface Operation component (see 2.4.1 The Interface Operation Component) is as described in Table 2-4.


Table 2-4. Mapping from XML Representation to Interface Operation Component Properties
Property Value
{name} The QName whose local name is the actual value of the name attribute information item and whose namespace name is the actual value of the targetNamespace attribute information item of the [parent] description element information item of the [parent] interface element information item.
{message exchange pattern} The actual value of the pattern attribute information item; otherwise 'http://www.w3.org/2006/01/wsdl/in-out'.
{interface message references} The set of message references corresponding to the input and output element information items in [children], if any.
{interface fault references} The set of interface fault references corresponding to the infault and outfault element information items in [children], if any.
{style} The set containing the IRIs in the actual value of the style attribute information item, if present; otherwise the set containing the IRIs in the actual value of the styleDefault attribute information item of the [parent] interface element information item, if present; otherwise empty.
{features} The set of Feature components corresponding to the feature element information items in [children], if any.
{properties} The set of Property components corresponding to the property element information items in [children], if any.
{parent} The Interface component corresponding to the interface element information item in [parent].

2.5 Interface Message Reference

2.5.1 The Interface Message Reference Component

An Interface Message Reference component associates a defined element with a message exchanged in an operation. By default, the element is defined in the XML Infoset [XML Information Set].

A message exchange pattern defines a set of placeholder messages that participate in the pattern and assigns them unique message labels within the pattern (e.g. 'In', 'Out'). The purpose of an Interface Message Reference component is to associate an actual message element (XML element declaration or some other declaration (see 3.2 Using Other Schema Languages)) with a message in the pattern, as identified by its message label. Later, when the message exchange pattern is instantiated, messages corresponding to that particular label will follow the element assignment made by the Interface Message Reference component.

The properties of the Interface Message Reference component are as follows:

  • {message label} REQUIRED. An xs:NCName. This property identifies the role this message plays in the {message exchange pattern} of the Interface Operation component this message is contained within. The value of this property MUST match the name of a placeholder message defined by the message exchange pattern.

  • {direction} REQUIRED. An xs:token with one of the values in or out, indicating whether the message is coming to the service or going from the service, respectively. The direction MUST be the same as the direction of the message identified by the {message label} property in the {message exchange pattern} of the Interface Operation component this is contained within.

  • {message content model} REQUIRED. An xs:token with one of the values #any, #none, #other, or #element. A value of #any indicates that the message content is any single element. A value of #none indicates there is no message content. A value of #other indicates that the message content is described by some other extension property that references a declaration in a non-XML extension type system. A value of #element indicates that the message consists of a single element described by the global element declaration referenced by the {element declaration} property. This property is used only when the message is described using an XML based data model.

  • {element declaration} OPTIONAL. A reference to an XML element declaration in the {element declarations} property of the Description component. This element represents the content or “payload” of the message. When the {message content model} property has the value #any or #none the {element declaration} property MUST be empty.

  • {features} OPTIONAL. A set of Feature components.

  • {properties} OPTIONAL. A set of Property components.

  • {parent} REQUIRED. The Interface Operation component that contains this component in its {interface message references} property.

Direction  [ show all ]  [ hide all ]

Let Direction be a message direction of either in or out:

Direction ::= inToken | outToken
MessageContentModel  [ show all ]  [ hide all ]

Let MessageContentModel be a message content model of either any, none, other, or element:

MessageContentModel ::= anyToken | noneToken | otherToken | elementToken
InterfaceMessageReference  [ show all ]  [ hide all ]

Let InterfaceMessageReference be the set of all Interface Message Reference components:

InterfaceMessageReference
NestedBase
messageLabel : NCName
direction : Direction
messageContentModel : MessageContentModel
elementDeclaration : OPTIONAL[ID]
messageContentModel = elementTokenelementDeclaration
  • The message content model is element exactly when the element declaration property is defined.

InterfaceMessageReferenceRI  [ show all ]  [ hide all ]

Each component referenced by an Interface Message Reference component must exist in the component model.

Let InterfaceMessageReferenceRI express the referential integrity constraints on the Interface Message Reference component:

InterfaceMessageReferenceRI
ComponentModel2
InterfaceMessageReference |θInterfaceMessageReferenceinterfaceMessageRefComps
      NestedBaseValid
      elementDeclarationelementDeclIds

For each Interface Message Reference component in the {interface message references} property of an Interface Operation component, its {message label} property MUST be unique.

InterfaceMessageReferenceKey  [ show all ]  [ hide all ]

Let InterfaceMessageReferenceKey express this uniqueness constraint on the Interface Message Reference component:

InterfaceMessageReferenceKey
ComponentModel2
x, y : interfaceMessageRefComps |
      x.parent = y.parent
      x.messageLabel = y.messageLabel x = y

If a type system not based upon the XML Infoset is in use (as considered in 3.2 Using Other Schema Languages) then additional properties would need to be added to the Interface Message Reference component (along with extensibility attributes to its XML representation) to allow associating such message types with the message reference.

InterfaceMessageReferenceCM  [ show all ]  [ hide all ]

Let InterfaceMessageReferenceCM be the conjunction of all the component model constraints on Interface Message Reference components.

InterfaceMessageReferenceCM
      InterfaceMessageReferenceRI
      InterfaceMessageReferenceKey

2.5.2 XML Representation of Interface Message Reference Component

<description>
  <interface>
    <operation>
      <input
            messageLabel="xs:NCName"?
            element="union of xs:QName, xs:token"? >
        <documentation />*
        [ <feature /> | <property /> ]*
      </input>
      <output
            messageLabel="xs:NCName"?
            element="union of xs:QName, xs:token"? >
        <documentation />*
        [ <feature /> | <property /> ]*
      </output>
    </operation>
  </interface>
</description>

The XML representation for an Interface Message Reference component is an element information item with the following Infoset properties:

2.5.2.1 messageLabel attribute information item with input or output [owner element]

The messageLabel attribute information item identifies the role of this message in the message exchange pattern of the given operation element information item.

The messageLabel attribute information item has the following Infoset properties:

  • A [local name] of messageLabel

  • A [namespace name] which has no value

The type of the messageLabel attribute information item is xs:NCName.

2.5.2.2 element attribute information item with input or output [owner element]

The element attribute information item has the following Infoset properties:

  • A [local name] of element .

  • A [namespace name] which has no value.

The type of the element attribute information item is a union of xs:QName and xs:token where the allowed token values are #any, #none, or #other.

2.5.3 Mapping Interface Message Reference's XML Representation to Component Properties

The mapping from the XML Representation of the interface message reference element information item (see 2.5.2 XML Representation of Interface Message Reference Component) to the properties of the Interface Message Reference component (see 2.5.1 The Interface Message Reference Component) is as described in Table 2-5.

Define the message exchange pattern of the element information item to be the {message exchange pattern} of the parent Interface Operation component.

Define the message direction of the element information item to be in if its local name is input and out if its local name is output .

The messageLabel attribute information item of an interface message reference element information item MUST be present if the message exchange pattern has more than one placeholder message with {direction} equal to the message direction.

If the messageLabel attribute information item of an interface message reference element information item is present then its actual value MUST match the {message label} of some placeholder message with {direction} equal to the message direction.

If the messageLabel attribute information item of an interface message reference element information item is absent then there MUST be a unique placeholder message with {direction} equal to the message direction.

Define the effective message label of an interface message reference element information item to be either the actual value of the messageLabel attribute information item if it is present, or the {message label} of the unique placeholder message with {direction} equal to the message direction if the attribute information item is absent.


Table 2-5. Mapping from XML Representation to Interface Message Reference Component Properties
Property Value
{message label} The effective message label.
{direction} The message direction.
{message content model} If the element attribute information item is present and its value is a QName, then #element: otherwise the actual value of the element attribute information item, if any; otherwise #other.
{element declaration} If the element attribute information item is present and its value is a QName, then the Element Declaration component from the {element declarations} property of the Description component resolved to by the value of the element attribute information item (see 2.19 QName resolution); otherwise empty. It is an error for the element attribute information item to have a value and for it to NOT resolve to an Element Declaration from the {element declarations} property of the Description.
{features} The set of Feature components corresponding to the feature element information items in [children], if any.
{properties} The set of Property components corresponding to the property element information items in [children], if any.
{parent} The Interface Operation component corresponding to the interface element information item in [parent].

2.6 Interface Fault Reference

2.6.1 The Interface Fault Reference Component

An Interface Fault Reference component associates a defined type, specified by an Interface Fault component, to a fault message exchanged in an operation.

A message exchange pattern defines a set of placeholder messages that participate in the pattern and assigns them unique message labels within the pattern (e.g. 'In', 'Out'). The purpose of an Interface Fault Reference component is to associate an actual message type (XML element declaration or some other declaration (see 3.2 Using Other Schema Languages) for message content, as specified by an Interface Fault component) with a fault message occurring in the pattern. In order to identify the fault message it describes, the Interface Fault Reference component uses the message label of the message the fault is associated with as a key.

The companion specification [WSDL 2.0 Adjuncts] defines several fault propagation rulesets that a given message exchange pattern may use. For the ruleset fault-replaces-message, the message that the fault relates to identifies the message in place of which the declared fault message will occur. Thus, the fault message will travel in the same direction as the message it replaces in the pattern. For the ruleset message-triggers-fault, the message that the fault relates to identifies the message after which the indicated fault may occur, in the opposite direction of the referred to message. That is, the fault message will travel in the opposite direction of the message it comes after in the message exchange pattern.

The properties of the Interface Fault Reference component are as follows:

  • {interface fault} REQUIRED. An Interface Fault component in the {interface faults} property of the [parent] Interface Operation component's [parent] Interface component, or an Interface component that it directly or indirectly extends. Identifying the Interface Fault component therefore indirectly defines the actual content or payload of the fault message.

  • {message label} REQUIRED. An xs:NCName. This property identifies the message this fault relates to among those defined in the {message exchange pattern} property of the Interface Operation component it is contained within. The value of this property MUST match the name of a placeholder message defined by the message exchange pattern.

  • {direction} REQUIRED. A xs:token with one of the values in or out, indicating whether the fault is coming to the service or going from the service, respectively. The direction MUST be consistent with the direction implied by the fault propagation ruleset used in the message exchange pattern of the operation. For example, if the ruleset fault-replaces-message is used, then a fault that refers to an outgoing message would have a {direction} property value of out. On the other hand, if the ruleset message-triggers-fault is used, then a fault that refers to an outgoing message would have a {direction} property value of in as the fault travels in the opposite direction of the message.

  • {features} OPTIONAL. A set of Feature components.

  • {properties} OPTIONAL. A set of Property components.

  • {parent} REQUIRED. The Interface Operation component that contains this component in its {interface fault references} property.

InterfaceFaultReference  [ show all ]  [ hide all ]

Let InterfaceFaultReference be the set of all Interface Fault Reference components:

InterfaceFaultReference
NestedBase
interfaceFault : ID
messageLabel : NCName
direction : Direction
InterfaceFaultReferenceRI  [ show all ]  [ hide all ]

Each component referenced by a Interface Fault Reference component must exist in the component model.

Let InterfaceFaultReferenceRI express the referential integrity constraints on the Interface Fault Reference component:

InterfaceFaultReferenceRI
ComponentModel2
InterfaceFaultReference |θInterfaceFaultReferenceinterfaceFaultRefComps
      NestedBaseValid
      interfaceFaultinterfaceFaultIds

For each Interface Fault Reference component in the {interface fault references} property of an Interface Operation component, the combination of its {interface fault} and {message label} properties MUST be unique.

InterfaceFaultReferenceKey  [ show all ]  [ hide all ]

Let InterfaceFaultReferenceKey express this uniqueness constraint on the Interface Fault Reference component:

InterfaceFaultReferenceKey
ComponentModel2
x, y : interfaceFaultRefComps |
      x.parent = y.parent
      x.interfaceFault = y.interfaceFault
      x.messageLabel = y.messageLabel x = y
InterfaceFaultReferenceConsistent  [ show all ]  [ hide all ]

An Interface Fault Reference component MUST refer to an Interface Fault component that is available in the associated Interface component. An Interface Fault component is available if it is contained in the Interface component or it is available in an Interface component that this Interface component extends.

Let InterfaceFaultReferenceConsistent express this consistency constraint on the Interface Fault Reference component:

InterfaceFaultReferenceConsistent
ComponentModel2
ifr: interfaceFaultRefComps;
      io : interfaceOpComps;
      i : interfaceComps |
      ifr.parent = io.id
      io.parent = i.id
      ifr.interfaceFaulti.allInterfaceFaults
InterfaceFaultReferenceCM  [ show all ]  [ hide all ]

Let InterfaceFaultReferenceCM be the conjunction of all the component model constraints on Interface Fault Reference components.

InterfaceFaultReferenceCM
      InterfaceFaultReferenceRI
      InterfaceFaultReferenceKey
      InterfaceFaultReferenceConsistent

2.6.2 XML Representation of Interface Fault Reference

<description>
  <interface>
    <operation>
      <infault
            ref="xs:QName"
            messageLabel="xs:NCName"? >
        <documentation />*
        [ <feature /> | <property /> ]*
      </infault>*
      <outfault
            ref="xs:QName"
            messageLabel="xs:NCName"? >
        <documentation />*
        [ <feature /> | <property /> ]*
      </outfault>*
    </operation>
  </interface>
</description>

The XML representation for a Interface Fault Reference component is an element information item with the following Infoset properties:

2.6.2.1 ref attribute information item with infault , or outfault [owner element]

The ref attribute information item refers to a fault component.

The ref attribute information item has the following Infoset properties:

  • A [local name] of ref

  • A [namespace name] which has no value

The type of the ref attribute information item is xs:QName.

2.6.2.2 messageLabel attribute information item with infault , or outfault [owner element]

The messageLabel attribute information item identifies the message in the message exchange pattern of the given operation element information item that is associated with this fault.

The messageLabel attribute information item has the following Infoset properties:

  • A [local name] of messageLabel

  • A [namespace name] which has no value

The type of the messageLabel attribute information item is xs:NCName.

The messageLabel attribute information item MUST be present in the XML representation of an Interface Fault Reference component with a given {direction} if the {message exchange pattern} of the parent Interface Operation component has more than one fault with that direction. Recall that the fault propagation ruleset of the {message exchange pattern} specifies the relation between faults and messages. For example, the fault-replaces-message ruleset specifies that the faults have the same direction as the messages, while the message-triggers-fault ruleset specifies that the faults have the opposite direction from the messages.

2.6.3 Mapping Interface Fault Reference's XML Representation to Component Properties

The mapping from the XML Representation of the message reference element information item (see 2.6.2 XML Representation of Interface Fault Reference) to the properties of the Interface Fault Reference component (see 2.6.1 The Interface Fault Reference Component) is as described in Table 2-6.

Define the message exchange pattern of the element information item to be the {message exchange pattern} of the parent Interface Operation component.

Define the fault direction of the element information item to be in if its local name is infault and out if its local name is outfault .

Define the message direction of the element information item to be the {direction} of the placeholder message associated with the fault as specifed by the fault propagation ruleset of the message exchange pattern.

The messageLabel attribute information item of an interface fault reference element information item MUST be present if the message exchange pattern has more than one placeholder message with {direction} equal to the message direction.

If the messageLabel attribute information item of an interface fault reference element information item is present then its actual value MUST match the {message label} of some placeholder message with {direction} equal to the message direction.

If the messageLabel attribute information item of an interface fault reference element information item is absent then there MUST be a unique placeholder message with {direction} equal to the message direction.

Define the effective message label of an interface fault reference element information item to be either the actual value of the messageLabel attribute information item if it is present, or the {message label} of the unique placeholder message whose {direction} is equal to the message direction if the attribute information item is absent.


Table 2-6. Mapping from XML Representation to Interface Fault Reference Component Properties
Property Value
{interface fault} The Interface Fault component from {interface faults} property of the parent Interface component, or an Interface component that it directly or indirectly extends, with {name} equal to the actual value of the ref attribute information item.
{message label} The effective message label.
{direction} The fault direction.
{features} The set of Feature components corresponding to the feature element information items in [children], if any.
{properties} The set of Property components corresponding to the property element information items in [children], if any.
{parent} The Interface Operation component corresponding to the interface element information item in [parent].

2.7 Feature

2.7.1 The Feature Component

A Feature component describes an abstract piece of functionality typically associated with the exchange of messages between communicating parties. Although WSDL 2.0 imposes no constraints on the potential scope of such features, examples might include “reliability”, “security”, “correlation”, and “routing”. The presence of a Feature component in a WSDL 2.0 description indicates that the service supports the feature and may require that a client that interacts with the service use that feature. Each Feature is identified by its IRI.

WSDL 2.0's Feature concept is derived from SOAP 1.2's abstract feature concept ([SOAP 1.2 Part 1: Messaging Framework]). Every SOAP 1.2 abstract feature is therefore also a WSDL 2.0 Feature. There is no need to define a separate WSDL 2.0 Feature in order to use a particular SOAP 1.2 feature. The SOAP 1.2 feature can be used directly.

The properties of the Feature component are as follows:

  • {ref} REQUIRED. An xs:anyURI. This xs:anyURI MUST be an absolute IRI as defined by [IETF RFC 3987]. This IRI SHOULD be dereferenceable to a document that directly or indirectly defines the meaning and use of the Feature that it identifies.

  • {required} REQUIRED. An xs:boolean. If the value of this property is true, then the client MUST use the Feature that is identified by the {ref} IRI. Otherwise, the client MAY use the Feature that is identified by the {ref} IRI. In either case, if the client does use the Feature that is identified by the {ref} IRI, then the client MUST obey all semantics implied by the definition of that Feature.

  • {parent} REQUIRED. The component that contains this component in its {features} property.

Feature  [ show all ]  [ hide all ]

Let Feature be the set of all Feature components:

Feature
Identifier
ref : AbsoluteURI
required : Boolean
Parent
FeatureRI  [ show all ]  [ hide all ]

The parent of a Feature MUST be in the component model.

Let FeatureRI express this referential integrity constraint on the Feature component:

FeatureRI
ComponentModel2
Feature |θFeaturefeatureComps
      ParentValid

The {ref} property of a Feature component MUST be unique within the {features} property of an Interface, Interface Fault, Interface Operation, Interface Message Reference, Interface Fault Reference, Binding, Binding Fault, Binding Operation, Binding Message Reference, Binding Fault Reference, Service, or Endpoint component.

FeatureKey  [ show all ]  [ hide all ]

Let FeatureKey express this uniqueness constraint on the Feature component:

FeatureKey
ComponentModel2
x, y : featureComps |
      x.parent = y.parent
      x.ref = y.ref x = y
  • No two Feature components contained by the same component have the same {ref} property.

FeatureCM  [ show all ]  [ hide all ]

Let FeatureCM be the conjunction of all the component model constraints on Feature components.

FeatureCM
      FeatureRI
      FeatureKey
2.7.1.1 Feature Composition Model

The set of features which are required or available for a given component consists of the combined set of ALL feature declarations applicable to that component. A feature is applicable to a component if:

  • it is asserted directly within that component, or

  • it is asserted in a containing component, or

  • it is asserted in a component referred to by the current component.

Many of the component types in the component model contain a {features} property, which is a set of Feature components. We refer to these as the declared features of the component. Furthermore, the {features} property is itself a subset of Feature components that are required or available for the given component as determined by the Feature Composition Model. We refer to these as the in-scope features of the component.

Features  [ show all ]  [ hide all ]

Let Features denote these sets of Feature components:

Features
Identifier
features :ID
inScopeFeatures :ID
featuresinScopeFeatures
  • The in-scope features for a component always include the declared features for that component.

FeaturesValid  [ show all ]  [ hide all ]

The Feature components contained by a given component MUST exist in the component model and the given component MUST be their parent.

Let FeaturesValid express these validity constraints on the {features} property of a component:

FeaturesValid
ComponentModel2
Features
featuresfeatureIds
f : featureComps
      f.idfeaturesf.parent = id
  • Each Feature component contained by this component MUST exist in the component model.

  • This component MUST be the parent of the Feature components it contains.

Following these rules, the set of features applicable at each component are as follows:

If a given feature is asserted at multiple locations, then the value of that feature at a particular component is determined by the conjunction of all the constraints implied by its asserted values. If a feature is not required then it may or may not be engaged, but if a feature is required then it must be engaged. Therefore, the conjunction of a required value and a non-required value is a required value. A composed feature is required if and only if at least one of its asserted values is required. This rule may be summarized as "true trumps".

2.7.1.1.1 Example of Feature Composition Model

In the following example, the depositFunds operation on the BankService has to be used with the ISO9001 , the notarization and the secure-channel features; they are all in scope. The fact that the notarization feature is declared both in the operation and in the binding has no effect.

<description targetNamespace="http://example.com/bank"
     xmlns=http://www.w3.org/2006/01/wsdl
     xmlns:ns1="http://example.com/bank">
  <interface name="ns1:Bank">
    <!-- All implementations of this interface must be secure -->
    <feature ref="http://example.com/secure-channel"
             required="true"/>
    <operation name="withdrawFunds">
      <!-- This operation must have ACID properties -->
      <feature ref="http://example.com/transaction"
               required="true"/>
      ...
    </operation>
    <operation name="depositFunds">
      <!-- This operation requires notarization -->
      <feature ref="http://example.com/notarization"
               required="true"/>
      ...
    </operation>
  </interface>

  <binding name="ns1:BankSOAPBinding">
    <!-- This particular binding requires ISO9001
         compliance to be verifiable -->
    <feature ref="http://example.com/ISO9001"
             required="true"/>
    <!-- This binding also requires notarization -->
    <feature ref="http://example.com/notarization"
             required="true"/>
  </binding>

  <service name="ns1:BankService"
           interface="tns:Bank">
    <endpoint binding="ns1:BankSOAPBinding">
      ...
    </endpoint>
  </service>
</description>

2.7.2 XML Representation of Feature Component

<feature
      ref="xs:anyURI" 
      required="xs:boolean"? >
  <documentation />*
</feature>

The XML representation for a Feature component is an element information item with the following Infoset properties:

  • A [local name] of feature

  • A [namespace name] of "http://www.w3.org/2006/01/wsdl"

  • One or more attribute information items amongst its [attributes] as follows:

  • Zero or more element information items amongst its [children], in order as follows:

    1. Zero or more documentation element information items (see 5. Documentation).

    2. Zero or more namespace-qualified element information items whose [namespace name] is NOT "http://www.w3.org/2006/01/wsdl".

2.7.2.1 ref attribute information item with feature [owner element]

The ref attribute information item specifies the IRI of the feature.

The ref attribute information item has the following Infoset properties:

  • A [local name] of ref

  • A [namespace name] which has no value

The type of the ref attribute information item is xs:anyURI .

2.7.2.2 required attribute information item with feature [owner element]

The required attribute information item specifies whether the use of the feature is mandatory or optional.

The required attribute information item has the following Infoset properties:

  • A [local name] of required

  • A [namespace name] which has no value

The type of the required attribute information item is xs:boolean .

2.7.3 Mapping Feature's XML Representation to Component Properties

The mapping from the XML Representation of the feature element information item (see 2.7.2 XML Representation of Feature Component) to the properties of the Feature component (see 2.7.1 The Feature Component) is as described in Table 2-7.


Table 2-7. Mapping from XML Representation to Feature Component Properties
Property Value
{ref} The actual value of the ref attribute information item.
{required} The actual value of the required attribute information item, if present, otherwise "false".
{parent} The component corresponding to the element information item in [parent].

2.8 Property

2.8.1 The Property Component

A “property” in the Features and Properties architecture represents a named runtime value which affects the behavior of some aspect of a Web service interaction, much like an environment variable. For example, a reliable messaging SOAP module may specify a property to control the number of retries in the case of network failure. WSDL 2.0 documents may specify the value constraints for these properties by referring to a Schema type, or by specifying a particular value. Properties, and hence property values, can be shared amongst features/bindings/modules, and are named with IRIs precisely to allow this type of sharing.

The properties of the Property component are as follows:

  • {ref} REQUIRED. An xs:anyURI. This xs:anyURI MUST be an absolute IRI as defined by [IETF RFC 3987]. This IRI SHOULD be dereferenceable to a document that directly or indirectly defines the meaning and use of the Property that it identifies.

  • {value constraint} OPTIONAL. A reference to a Type Definition component in the {type definitions} property of the Description component constraining the value of the Property, or the token #value if the {value} property is not empty.

  • {value} OPTIONAL. The value of the Property, an ordered list of child information items, as specified by the [children] property of element information items in [XML Information Set].

  • {parent} REQUIRED. The component that contains this component in its {properties} property.

ValueConstraint  [ show all ]  [ hide all ]

Let ValueConstraint be the set of value constraints for Property components:

ValueConstraint ::= typeDefinitionIdID| valueToken
See ID.
  • A value constraint is either a Type Definition component which defines the set of allowable values, or the token #value which indicates that the value is given by the contents of the value property of the Property component.

ElementChildren  [ show all ]  [ hide all ]

Let ElementChildren be the set of all allowable values of the [children] property of an XML Infoset element information item:

[ElementChildren]
Property  [ show all ]  [ hide all ]

Let Property be the set of all Property components:

Property
Identifier
ref : AbsoluteURI
valueConstraint : OPTIONAL[ValueConstraint]
value : OPTIONAL[ElementChildren]
Parent
valueConstraint = {valueToken}value
  • The value is constrained to be an explicitly given value exactly when the {value} property is defined.

PropertyRI  [ show all ]  [ hide all ]

Each component referenced by a Property component must exist in the component model.

Let PropertyRI express the referential integrity constraints on the Property component:

PropertyRI
ComponentModel2
Property; y : ID |θPropertypropertyComps
      valueConstraint = {typeDefinitionId(y)}ytypeDefIds
      ParentValid
  • If the value constraint of a Property component is a type definition, then the Type Definition component is contained in the component model.

  • The parent of each Property component is contained in the component model.

The {ref} property of a Property component MUST be unique within the {properties} property of an Interface, Interface Fault, Interface Operation, Interface Message Reference, Interface Fault Reference, Binding, Binding Fault, Binding Operation, Binding Message Reference, Binding Fault Reference, Service, or Endpoint component.

PropertyKey  [ show all ]  [ hide all ]

Let PropertyKey express this uniqueness constraint on the Property component:

PropertyKey
ComponentModel2
x, y : propertyComps |
      x.parent = y.parent
      x.ref = y.ref x = y
  • No two Property components contained by the same component have the same {ref} property.

If a type system not based upon the XML Infoset is in use (as considered in 3.2 Using Other Schema Languages) then additional properties would need to be added to the Property component (along with extensibility attributes to its XML representation) to allow using such a type system to describe values and constraints for properties.

PropertyCM  [ show all ]  [ hide all ]

Let PropertyCM be the conjunction of all the component model constraints on Property components.

PropertyCM
      PropertyRI
      PropertyKey
2.8.1.1 Property Composition Model

At runtime, the behavior of features, (SOAP) modules and bindings may be affected by the values of in-scope properties. Properties combine into a virtual “execution context” which maps property names (IRIs) to constraints. Each property IRI MAY therefore be associated with AT MOST one property constraint for a given interaction.

The set of properties which are required or available for a given component consists of the combined set of ALL property declarations applicable to that component. A property is applicable to a component if:

  • it is asserted directly within that component, or

  • it is asserted in a containing component, or

  • it is asserted in a component referred to by the current component.

Many of the component types in the component model contain a {properties} property, which is a set of Property components. We refer to these as the declared properties of the component. Furthermore, the {properties} property is itself a subset of Property components that are required or available for the given component as determined by the Property Composition Model. We refer to these as the in-scope properties of the component.

Properties  [ show all ]  [ hide all ]

Let Properties denote these sets of Property components:

Properties
Identifier
properties :ID
inScopeProperties :ID
propertiesinScopeProperties
  • The in-scope properties for a component always include the declared properties for that component.

PropertiesValid  [ show all ]  [ hide all ]

The Property components contained by a given component MUST exist in the component model and the given component MUST be their parent.

Let PropertiesValid express these validity constraints on the {properties} property of a component:

PropertiesValid
ComponentModel2
Properties
propertiespropertyIds
p : propertyComps
      p.idpropertiesp.parent = id
  • Each Property component contained by this component MUST exist in the component model.

  • This component MUST be the parent of the Property components it contains.

Following these rules, the set of properties applicable at each component are as follows:

Note that, in the text above, “property constraint” (or, simply, “constraint”) is used to mean EITHER a constraint inside a Property component OR a value , since value may be considered a special case of constraint .

If a given Property is asserted at multiple locations, then the value of that Property at a particular component is determined by the conjunction of all the constraints of its in-scope Property components. A Property constraint asserts that, for a given interaction, the value of a Property is either a specified value or belongs to a specified set of values. A specified value may be regarded as a singleton set, so in both cases a Property constraint corresponds to an assertion that the Property value belongs to some set. The conjunction of all the constraints associated with the in-scope properties is an assertion that the property value belongs to each of the associated sets, or equivalently, that the value belongs to the intersection of all the associated sets. If the intersection of the associated sets is empty, then the property constraints are mutually incompatible, and the composition is invalid. Therefore, the intersection of the associated sets SHOULD NOT be empty.

Note:

The reason that we phrase the requirement for a non-empty intersection as SHOULD rather than MUST, is that in general, it may be computationally difficult to determine by inspection of the type definitions that the intersection of two or more value sets is empty. Therefore, it is not a strict validity requirement that the intersection of the value sets be non-empty. An empty intersection will always result in failure of the service at run-time.

However, it is in general feasible to test specified values for either equality or membership in value sets. All specified values MUST be equal and belong to each specified value set.

2.8.2 XML Representation of Property Component

<property
      ref="xs:anyURI" >
  <documentation />*
  [ <value /> | <constraint /> ]?
</property>

The XML representation for a Property component is an element information item with the following Infoset properties:

2.8.2.1 ref attribute information item with property [owner element]

The ref attribute information item specifies the IRI of the property. It has the following Infoset properties:

  • A [local name] of ref

  • A [namespace name] which has no value

The type of the ref attribute information item is xs:anyURI .

2.8.2.2 value element information item with property [parent]
<property>
  <value>
    xs:anyType
  </value>
</property>

The value element information item specifies the value of the property. It has the following Infoset properties:

  • A [local name] of value

  • A [namespace name] of "http://www.w3.org/2006/01/wsdl"

The type of the value element information item is xs:anyType .

2.8.2.3 constraint element information item with property [parent]
<property>
  <constraint>
    xs:QName
  </constraint>
</property>

The constraint element information item specifies a constraint on the value of the property. It has the following Infoset properties:

  • A [local name] of constraint

  • A [namespace name] of "http://www.w3.org/2006/01/wsdl"

The type of the constraint attribute information item is xs:QName .

2.8.3 Mapping Property's XML Representation to Component Properties

The mapping from the XML Representation of the property element information item (see 2.8.2 XML Representation of Property Component) to the properties of the Property component (see 2.8.1 The Property Component) is as described in Table 2-8.


Table 2-8. Mapping from XML Representation to Property Component Properties
Property Value
{ref} The actual value of the ref attribute information item.
{value constraint} If the constraint element information item is present, the Type Definition component from the {type definitions} property of the Description component resolved to by the value of the constraint element information item (see 2.19 QName resolution); otherwise, if the value element information item is present, the token #value; otherwise empty.
{value} The value of the [children] property of the value element information item, if that element is present, otherwise empty.
{parent} The component corresponding to the element information item in [parent].

2.9 Binding

2.9.1 The Binding Component

A Binding component describes a concrete message format and transmission protocol which may be used to define an endpoint (see 2.15 Endpoint). That is, a Binding component defines the implementation details necessary to access the service.

Binding components can be used to describe such information in a reusable manner for any interface or specifically for a given interface. Furthermore, binding information MAY be specified on a per-operation basis (see 2.11.1 The Binding Operation Component) within an interface in addition to across all operations of an interface.

If a Binding component specifies any operation-specific binding details (by including Binding Operation components) or any fault binding details (by including Binding Fault components) then it MUST specify an interface the Binding component applies to, so as to indicate which interface the operations come from.

Conversely, a Binding component which omits any operation-specific binding details and any fault binding details MAY omit specifying an interface. Binding components that do not specify an interface MAY be used to specify operation-independent binding details for Service components with different interfaces. That is, such Binding components are reusable across one or more interfaces.

No concrete binding details are given in this specification. The companion specification, WSDL (Version 2.0): Adjuncts [WSDL 2.0 Adjuncts] defines such bindings for SOAP 1.2 [SOAP 1.2 Part 1: Messaging Framework] and HTTP [IETF RFC 2616]. Other specifications MAY define additional binding details. Such specifications are expected to annotate the Binding component (and its sub-components) with additional properties and specify the mapping from the XML representation to those properties.

A Binding component that defines bindings for an Interface component MUST define bindings for all the operations of that Interface component. The bindings may occur via defaulting rules which allow one to specify default bindings for all operations (see, for example [WSDL 2.0 Adjuncts]) or by directly listing each Interface Operation component of the Interface component and defining bindings for them. Thus, it is an error for a Binding component to not define bindings for all the Interface Operation components of the Interface component for which the Binding component purportedly defines bindings for.

Bindings are named constructs and can be referred to by QName (see 2.19 QName resolution). For instance, Endpoint components refer to bindings in this way.

The properties of the Binding component are as follows:

  • {name} REQUIRED. An xs:QName.

  • {interface} OPTIONAL. An Interface component indicating the interface for which binding information is being specified.

  • {type} REQUIRED. An xs:anyURI. This xs:anyURI MUST be an absolute IRI as defined by [IETF RFC 3987]. The value of this IRI indicates what kind of concrete binding details are contained within this Binding component. Specifications (such as [WSDL 2.0 Adjuncts] ) that define such concrete binding details MUST specify appropriate values for this property. The value of this property MAY be the namespace name of the extension elements or attributes which define those concrete binding details.

  • {binding faults} OPTIONAL. A set of Binding Fault components.

  • {binding operations} OPTIONAL. A set of Binding Operation components.

  • {features} OPTIONAL. A set of Feature components.

  • {properties} OPTIONAL. A set of Property components.

Binding  [ show all ]  [ hide all ]

Let Binding be the set of all Binding components:

Binding
Base
name : QName
interface : OPTIONAL[ID]
type : AbsoluteURI
bindingFaults :ID
bindingOperations :ID
interface =
      bindingFaults =
      bindingOperations =
  • If no Interface component is specified then there MUST NOT be any faults or operations defined.

BindingRI  [ show all ]  [ hide all ]

Each component referenced by a Binding component must exist in the component model.

Let BindingRI express the referential integrity constraints on the Binding component:

BindingRI
ComponentModel2
Binding |θBindingbindingComps
      BaseValid
      interfaceinterfaceIds
      bindingFaultsbindingFaultIds
      bindingOperationsbindingOpIds
  • Every Binding component satifies the base validity constraints.

  • The Interface component of each Binding component is contained in the component model.

  • The Binding Fault components of each Binding component are contained in the component model.

  • The Binding Operation components of each Binding component are contained in the component model.

For each Binding component in the {bindings} property of a Description component, the {name} property MUST be unique.

BindingKey  [ show all ]  [ hide all ]

Let BindingKey express the QName uniqueness constraint on the Binding component:

BindingKey
ComponentModel2
x, y : bindingComps |
      x.name = y.name x = y
  • No two Binding components have the same QName.

BindingParent  [ show all ]  [ hide all ]

A Binding component contains nested Binding Operation and Binding Fault components. These components MUST have the Binding component as their parent.

Let BindingParent express the constraints on the {parent} properties of the nested components of a Binding component:

BindingParent
ComponentModel2
b : bindingComps;
      bf : bindingFaultComps;
      bo : bindingOpComps
      bf.idb.bindingFaultsbf.parent = b.id
      bo.idb.bindingOperationsbo.parent = b.id
BindingCM  [ show all ]  [ hide all ]

Let BindingCM be the conjunction of all the component model constraints on Binding components.

BindingCM
      BindingRI
      BindingKey
      BindingParent

2.9.2 XML Representation of Binding Component

<description>
  <binding
        name="xs:NCName" 
        interface="xs:QName"?
        type="xs:anyURI" >
    <documentation />*
    [ <fault /> | <operation /> | <feature /> | <property /> ]*
  </binding>
</description>

The XML representation for a Binding component is an element information item with the following Infoset properties:

2.9.2.1 name attribute information item with binding [owner element]

The name attribute information item together with the targetNamespace attribute information item of the description element information item forms the QName of the binding.

The name attribute information item has the following Infoset properties:

  • A [local name] of name

  • A [namespace name] which has no value

The type of the name attribute information item is xs:NCName.

2.9.2.2 interface attribute information item with binding [owner element]

The interface attribute information item refers, by QName, to an Interface component.

The interface attribute information item has the following Infoset properties:

  • A [local name] of interface

  • A [namespace name] which has no value

The type of the interface attribute information item is xs:QName.

2.9.2.3 type attribute information item with binding [owner element]

The type attribute information item identifies the kind of binding details contained in the Binding component.

The type attribute information item has the following Infoset properties:

  • A [local name] of type

  • A [namespace name] which has no value

The type of the type attribute information item is xs:anyURI.

2.9.2.4 Binding extension elements

Binding extension elements are used to provide information specific to a particular binding. The semantics of such element information items are defined by the specification for those element information items. Such specifications are expected to annotate the Binding component with additional properties and specify the mapping from the XML representation to those properties.

2.9.3 Mapping Binding's XML Representation to Component Properties

The mapping from the XML Representation of the binding element information item (see 2.9.2 XML Representation of Binding Component) to the properties of the Binding component (see 2.9.1 The Binding Component) is as described in Table 2-9.


Table 2-9. Mapping from XML Representation to Binding Component Properties
Property Value
{name} The QName whose local name is the actual value of the name attribute information item and whose namespace name is the actual value of the targetNamespace attribute information item of the [parent] description element information item.
{interface} The Interface component resolved to by the actual value of the interface attribute information item (see 2.19 QName resolution), if any.
{type} The actual value of the type attribute information item.
{binding faults} The set of Binding Fault components corresponding to the fault element information items in [children], if any.
{binding operations} The set of Binding Operation components corresponding to the operation element information items in [children], if any.
{features} The set of Feature components corresponding to the feature element information items in [children], if any.
{properties} The set of Property components corresponding to the property element information items in [children], if any.

2.10 Binding Fault

2.10.1 The Binding Fault Component

A Binding Fault component describes a concrete binding of a particular fault within an interface to a particular concrete message format. A particular fault of an interface is uniquely identified by its {name} property.

Note that the fault does not occur by itself - it occurs as part of a message exchange as defined by an Interface Operation component (and its binding counterpart the Binding Operation component). Thus, the fault binding information specified in a Binding Fault component describes how faults that occur within a message exchange of an operation will be formatted and carried in the transport.

The properties of the Binding Fault component are as follows:

BindingFault  [ show all ]  [ hide all ]

Let BindingFault be the set of all Binding Fault components:

BindingFault
NestedBase
interfaceFault : ID
BindingFaultRI  [ show all ]  [ hide all ]

Each component referenced by a Binding Fault component must exist in the component model.

Let BindingFaultRI express the referential integrity constraints on the Binding Fault component:

BindingFaultRI
ComponentModel2
BindingFault |θBindingFaultbindingFaultComps
      NestedBaseValid
      interfaceFaultinterfaceFaultIds

For each Binding Fault component in the {binding faults} property of a Binding component, the {interface fault} property MUST be unique. That is, one cannot define multiple bindings for the same fault within a given Binding component.

BindingFaultKey  [ show all ]  [ hide all ]

Let BindingFaultKey express this uniqueness constraint on the Binding Fault component:

BindingFaultKey
ComponentModel2
x, y : bindingFaultComps |
      x.parent = y.parent
      x.interfaceFault = y.interfaceFault x = y
BindingFaultConsistent  [ show all ]  [ hide all ]

A Binding Fault component MUST bind an Interface Fault component that is available in the Interface component associated with the Binding component. An Interface Fault component is available if it is contained in the Interface component or is available in an extended Interface component.

Let BindingFaultConsistent express this consistency contraint on Binding Fault components:

BindingFaultConsistent
ComponentModel2
bf : bindingFaultComps;
      b : bindingComps;
      i : interfaceComps |
      bf.parent = b.id
      b.interface = {i.id}
      bf.interfaceFaulti.allInterfaceFaults
BindingFaultCM  [ show all ]  [ hide all ]

Let BindingFaultCM be the conjunction of all the component model constraints on Binding Fault components.

BindingFaultCM
      BindingFaultRI
      BindingFaultKey
      BindingFaultConsistent

2.10.2 XML Representation of Binding Fault Component

<description>
  <binding>
    <fault
          ref="xs:QName" >
      <documentation />*
      [ <feature /> | <property /> ]*
    </fault>
  </binding>
</description>

The XML representation for a Binding Fault component is an element information item with the following Infoset properties:

  • A [local name] of fault

  • A [namespace name] of "http://www.w3.org/2006/01/wsdl"

  • One or more attribute information items amongst its [attributes] as follows:

  • Zero or more element information item amongst its [children], in order, as follows:

    1. Zero or more documentation element information items (see 5. Documentation).

    2. Zero or more element information items from among the following, in any order:

2.10.2.1 ref attribute information item with fault [owner element]

The ref attribute information item has the following Infoset properties:

  • A [local name] of ref

  • A [namespace name] which has no value

The type of the ref attribute information item is xs:QName.

2.10.2.2 Binding Fault extension elements

Binding Fault extension elements are used to provide information specific to a particular fault in a binding. The semantics of such element information items are defined by the specification for those element information items. Such specifications are expected to annotate the Binding Fault component with additional properties and specify the mapping from the XML representation to those properties.

2.10.3 Mapping Binding Fault's XML Representation to Component Properties

The mapping from the XML Representation of the fault element information item (see 2.10.2 XML Representation of Binding Fault Component) to the properties of the Binding Fault component (see 2.10.1 The Binding Fault Component) is as described in Table 2-10.


Table 2-10. Mapping from XML Representation to Binding Fault Component Properties
Property Value
{interface fault} The Interface Fault Component corresponding to the actual value of the ref attribute information item.
{features} The set of Feature components corresponding to the feature element information items in [children], if any.
{properties} The set of Property components corresponding to the property element information items in [children], if any.
{parent} The Binding component corresponding to the binding element information item in [parent].

2.11 Binding Operation

2.11.1 The Binding Operation Component

The Binding Operation component describes the concrete message format(s) and protocol interaction(s) associated with a particular interface operation for a given endpoint. A particular operation of an interface is uniquely identified by its {name} property.

The properties of the Binding Operation component are as follows:

BindingOperation  [ show all ]  [ hide all ]

Let BindingOperation be the set of all Binding Operation components:

BindingOperation
NestedBase
interfaceOperation : ID
bindingMessageReferences :ID
bindingFaultReferences :ID
BindingOperationRI  [ show all ]  [ hide all ]

Each component referenced by a Binding Operation component must exist in the component model.

Let BindingOperationRI express the referential integrity constraints on the Binding Operation component:

BindingOperationRI
ComponentModel2
BindingOperation |θBindingOperationbindingOpComps
      NestedBaseValid
      interfaceOperationinterfaceOpIds
      bindingMessageReferencesbindingMessageRefIds
      bindingFaultReferencesbindingFaultRefIds

For each Binding Operation component in the {binding operations} property of a Binding component, the {interface operation} property MUST be unique. That is, one cannot define multiple bindings for the same operation within a given Binding component.

BindingOperationKey  [ show all ]  [ hide all ]

Let BindingOperationKey express this uniqueness constraint on the Binding Operation component:

BindingOperationKey
ComponentModel2
x, y : bindingOpComps |
      x.parent = y.parent
      x.interfaceOperation = y.interfaceOperation x = y
BindingOperationParent  [ show all ]  [ hide all ]

A Binding Operation component contains nested Binding Message Reference and Binding Fault Reference components. These components MUST have the Binding Operation component as their parent.

Let BindingOperationParent express the constraints on the {parent} properties of the nested components of a Binding Operation component:

BindingOperationParent
ComponentModel2
bo : bindingOpComps;
      bfr : bindingFaultRefComps;
      bmr : bindingMessageRefComps
      bfr.idbo.bindingFaultReferencesbfr.parent = bo.id
      bmr.idbo.bindingMessageReferencesbmr.parent = bo.id
BindingOperationConsistent  [ show all ]  [ hide all ]

A Binding Operation component MUST bind an Interface Operation component that is available in the Interface component associated with the Binding component. An Interface Operation component is available if it is contained in the Interface component or is available in an extended Interface component.

Let BindingOperationConsistent express this consistency contraint on Binding Operation components:

BindingOperationConsistent
ComponentModel2
bo : bindingOpComps;
      b : bindingComps;
      i : interfaceComps |
      bo.parent = b.id
      b.interface = {i.id}
      bo.interfaceOperationi.allInterfaceOperations
BindingOperationCM  [ show all ]  [ hide all ]

Let BindingOperationCM be the conjunction of all the component model constraints on Binding Operation components.

BindingOperationCM
      BindingOperationRI
      BindingOperationKey
      BindingOperationParent
      BindingOperationConsistent

2.11.2 XML Representation of Binding Operation Component

<description>
  <binding>
    <operation
          ref="xs:QName" >
      <documentation />*
      [ <input /> | <output /> | <infault /> | <outfault /> | <feature /> | <property /> ]*
    </operation>
  </binding>
</description>

The XML representation for a Binding Operation component is an element information item with the following Infoset properties:

2.11.2.1 ref attribute information item with operation [owner element]

The ref attribute information item has the following Infoset properties:

  • A [local name] of ref

  • A [namespace name] which has no value

The type of the ref attribute information item is xs:QName.

2.11.2.2 Binding Operation extension elements

Binding Operation extension elements are used to provide information specific to a particular operation in a binding. The semantics of such element information items are defined by the specification for those element information items. Such specifications are expected to annotate the Binding Operation component with additional properties and specify the mapping from the XML representation to those properties.

2.11.3 Mapping Binding Operation's XML Representation to Component Properties

The mapping from the XML Representation of the operation element information item (see 2.11.2 XML Representation of Binding Operation Component) to the properties of the Binding Operation component is as described in Table 2-11.


Table 2-11. Mapping from XML Representation to Binding Operation Component Properties
Property Value
{interface operation} The Interface Operation component corresponding to the actual value of the ref attribute information item.
{binding message references} The set of Binding Message Reference components corresponding to the input and output element information items in [children], if any.
{binding fault references} The set of Binding Fault Reference components corresponding to the infault and outfault element information items in [children], if any.
{features} The set of Feature components corresponding to the feature element information items in [children], if any.
{properties} The set of Property components corresponding to the property element information items in [children], if any.
{parent} The Binding component corresponding to the binding element information item in [parent].

2.12 Binding Message Reference

2.12.1 The Binding Message Reference Component

A Binding Message Reference component describes a concrete binding of a particular message participating in an operation to a particular concrete message format.

The properties of the Binding Message Reference component are as follows:

BindingMessageReference  [ show all ]  [ hide all ]

Let BindingMessageReference be the set of all Binding Message Reference components:

BindingMessageReference
NestedBase
interfaceMessageReference : ID
BindingMessageReferenceRI  [ show all ]  [ hide all ]

Each component referenced by a Binding Message Reference component must exist in the component model.

Let BindingMessageReferenceRI express the referential integrity constraints on the Binding Message Reference component:

BindingMessageReferenceRI
ComponentModel2
BindingMessageReference |
      θBindingMessageReferencebindingMessageRefComps
            NestedBaseValid
            interfaceMessageReferenceinterfaceMessageRefIds

For each Binding Message Reference component in the {binding message references} property of a Binding Operation component, the {interface message reference} property MUST be unique. That is, the same message cannot be bound twice within the same operation.

BindingMessageReferenceKey  [ show all ]  [ hide all ]

Let BindingMessageReferenceKey express this uniqueness constraint on the Binding Message Reference component:

BindingMessageReferenceKey
ComponentModel2
x, y : bindingMessageRefComps |
      x.parent = y.parent
      x.interfaceMessageReference = y.interfaceMessageReference
      x = y
BindingMessageReferenceConsistent  [ show all ]  [ hide all ]

The Interface Message Reference component bound by a Binding Message Reference component MUST be contained in the Interface Operation component that is being bound by the Binding Operation that contains this Binding Message Reference component.

Let BindingMessageReferenceConsistent express this consistency constraint:

BindingMessageReferenceConsistent
ComponentModel2
bmr : bindingMessageRefComps;
      bo : bindingOpComps;
      imr : interfaceMessageRefComps |
      bmr.parent = bo.id
      bmr.interfaceMessageReference = imr.id
      bo.interfaceOperation = imr.parent
BindingMessageReferenceCM  [ show all ]  [ hide all ]

Let BindingMessageReferenceCM be the conjunction of all the component model constraints on Binding Message Reference components.

BindingMessageReferenceCM
      BindingMessageReferenceRI
      BindingMessageReferenceKey
      BindingMessageReferenceConsistent

2.12.2 XML Representation of Binding Message Reference Component

<description>
  <binding>
    <operation>
      <input
            messageLabel="xs:NCName"? >
        <documentation />*
        [ <feature /> | <property /> ]*
      </input>
      <output
            messageLabel="xs:NCName"? >
        <documentation />*
        [ <feature /> | <property /> ]*
      </output>
    </operation>
  </binding>
</description>

The XML representation for a Binding Message Reference component is an element information item with the following Infoset properties:

2.12.2.1 messageLabel attribute information item with input or output [owner element]

The messageLabel attribute information item has the following Infoset properties:

  • A [local name] of messageLabel .

  • A [namespace name] which has no value.

The type of the messageLabel attribute information item is xs:NCName.

2.12.2.2 Binding Message Reference extension elements

Binding Message Reference extension elements are used to provide information specific to a particular message in an operation. The semantics of such element information items are defined by the specification for those element information items. Such specifications are expected to annotate the Binding Message Reference component with additional properties and specify the mapping from the XML representation to those properties..

2.12.3 Mapping Binding Message Reference's XML Representation to Component Properties

The mapping from the XML Representation of the binding element information item (see 2.12.2 XML Representation of Binding Message Reference Component) to the properties of the Binding Message Reference component is as described in Table 2-12.

Define the message exchange pattern of the element information item to be the {message exchange pattern} of the Interface Operation component being bound.

Define the message direction of the element information item to be in if its local name is input and out if its local name is output .

The messageLabel attribute information item of a binding message reference element information item MUST be present if the message exchange pattern has more than one placeholder message with {direction} equal to the message direction.

If the messageLabel attribute information item of a binding message reference element information item is present then its actual value MUST match the {message label} of some placeholder message with {direction} equal to the message direction.

If the messageLabel attribute information item of a binding message reference element information item is absent then there MUST be a unique placeholder message with {direction} equal to the message direction.

Define the effective message label of a binding message reference element information item to be either the actual value of the messageLabel attribute information item if it is present, or the {message label} of the unique placeholder message with {direction} equal to the message direction if the attribute information item is absent.


Table 2-12. Mapping from XML Representation to Binding Message Reference Component Properties
Property Value
{interface message reference} The Interface Message Reference component in the {interface message references} of the Interface Operation component being bound with {message label} equal to the effective message label.
{features} The set of Feature components corresponding to the feature element information items in [children], if any.
{properties} The set of Property components corresponding to the property element information items in [children], if any.
{parent} The Binding Operation component corresponding to the operation element information item in [parent].

2.13 Binding Fault Reference

2.13.1 The Binding Fault Reference Component

A Binding Fault Reference component describes a concrete binding of a particular fault participating in an operation to a particular concrete message format.

The properties of the Binding Fault Reference component are as follows:

BindingFaultReference  [ show all ]  [ hide all ]

Let BindingFaultReference be the set of all Binding Fault Reference components:

BindingFaultReference
NestedBase
interfaceFaultReference: ID
BindingFaultReferenceRI  [ show all ]  [ hide all ]

Each component referenced by a Binding Fault Reference component must exist in the component model.

Let BindingFaultReferenceRI express the referential integrity constraints on the Binding Fault Reference component:

BindingFaultReferenceRI
ComponentModel2
BindingFaultReference |
      θBindingFaultReferencebindingFaultRefComps
            NestedBaseValid
            interfaceFaultReferenceinterfaceFaultRefIds

For each Binding Fault Reference component in the {binding fault references} property of a Binding Operation component, the {interface fault reference} property MUST be unique. That is, the same fault cannot be bound twice within the same operation.

BindingFaultReferenceKey  [ show all ]  [ hide all ]

Let BindingFaultReferenceKey express this uniqueness constraint on the Binding Fault Reference component:

BindingFaultReferenceKey
ComponentModel2
x, y : bindingFaultRefComps |
      x.parent = y.parent
      x.interfaceFaultReference = y.interfaceFaultReference
      x = y
BindingFaultReferenceConsistent  [ show all ]  [ hide all ]

The Interface Fault Reference component bound by a Binding Fault Reference component MUST be contained in the Interface Operation component that is being bound by the Binding Operation that contains this Binding Fault Reference component.

Let BindingFaultReferenceConsistent express this consistency constraint:

BindingFaultReferenceConsistent
ComponentModel2
bfr : bindingFaultRefComps;
      bo : bindingOpComps;
      ifr : interfaceFaultRefComps |
      bfr.parent = bo.id
      bfr.interfaceFaultReference = ifr.id
      bo.interfaceOperation = ifr.parent
BindingFaultReferenceCM  [ show all ]  [ hide all ]

Let BindingFaultReferenceCM be the conjunction of all the component model constraints on Binding Fault Reference components.

BindingFaultReferenceCM
      BindingFaultReferenceRI
      BindingFaultReferenceKey
      BindingFaultReferenceConsistent

2.13.2 XML Representation of Binding Fault Reference Component

<description>
  <binding>
    <operation>
      <infault
            ref="xs:QName"
            messageLabel="xs:NCName"?>
        <documentation />*
        [ <feature /> | <property /> ]*
      </infault>
      <outfault
            ref="xs:QName"
            messageLabel="xs:NCName"?>
        <documentation />*
        [ <feature /> | <property /> ]*
      </outfault>
    </operation>
  </binding>
</description>

The XML representation for a Binding Fault Reference component is an element information item with the following Infoset properties:

2.13.2.1 ref attribute information item with infault or outfault [owner element]

The ref attribute information item has the following Infoset properties:

  • A [local name] of ref .

  • A [namespace name] which has no value.

The type of the ref attribute information item is xs:QName.

2.13.2.2 messageLabel attribute information item with infault or outfault [owner element]

The messageLabel attribute information item has the following Infoset properties:

  • A [local name] of messageLabel .

  • A [namespace name] which has no value.

The type of the messageLabel attribute information item is xs:NCName.

2.13.2.3 Binding Fault Reference extension elements

Binding Fault Reference extension elements are used to provide information specific to a particular fault in an operation. The semantics of such element information items are defined by the specification for those element information items. Such specifications are expected to annotate the Binding Fault Reference component with additional properties and specify the mapping from the XML representation to those properties..

2.13.3 Mapping Binding Fault Reference's XML Representation to Component Properties

The mapping from the XML Representation of the binding element information item (see 2.13.2 XML Representation of Binding Fault Reference Component) to the properties of the Binding Fault Reference component is as described in Table 2-13.

Define the message exchange pattern of the element information item to be the {message exchange pattern} of the Interface Operation component being bound.

Define the fault direction of the element information item to be in if its local name is infault and out if its local name is outfault .

Define the message direction of the element information item to be the {direction} of the placeholder message associated with the fault as specifed by the fault propagation ruleset of the message exchange pattern.

The messageLabel attribute information item of a binding fault reference element information item MUST be present if the message exchange pattern has more than one placeholder message with {direction} equal to the message direction.

If the messageLabel attribute information item of a binding fault reference element information item is present then its actual value MUST match the {message label} of some placeholder message with {direction} equal to the message direction.

If the messageLabel attribute information item of a binding fault reference element information item is absent then there MUST be a unique placeholder message with {direction} equal to the message direction.

Define the effective message label of a binding fault reference element information item to be either the actual value of the messageLabel attribute information item if it is present, or the {message label} of the unique placeholder message with {direction} equal to the message direction if the attribute information item is absent.

There MUST be an Interface Fault Reference component in the {interface fault references} of the Interface Operation being bound with {message label} equal to the effective message label and with {interface fault} equal to an Interface Fault component with {name} equal to the actual value of the ref attribute information item.


Table 2-13. Mapping from XML Representation to Binding Fault Reference Component Properties
Property Value
{interface fault reference} The Interface Fault Reference component in the {interface fault references} of the Interface Operation being bound with {message label} equal to the effective message label and with {interface fault} equal to an Interface Fault component with {name} equal to the actual value of the ref attribute information item.
{features} The set of Feature components corresponding to the feature element information items in [children], if any.
{properties} The set of Property components corresponding to the property element information items in [children], if any.
{parent} The Binding Operation component corresponding to the operation element information item in [parent].

2.14 Service

2.14.1 The Service Component

A Service component describes a set of endpoints (see 2.15 Endpoint) at which a particular deployed implementation of the service is provided. The endpoints thus are in effect alternate places at which the service is provided.

Services are named constructs and can be referred to by QName (see 2.19 QName resolution).

The properties of the Service component are as follows:

Service  [ show all ]  [ hide all ]

Let Service be the set of all Service components:

Service
Base
name : QName
interface : ID
endpoints :1ID
See Base, QName, ID.
ServiceRI  [ show all ]  [ hide all ]

Each component referenced by a Service component must exist in the component model.

Let ServiceRI express the referential integrity constraints on the Service component:

ServiceRI
ComponentModel2
Service |θServiceserviceComps
      BaseValid
      interfaceinterfaceIds
      endpointsendpointIds
  • Every Service component satifies the base validity constraints.

  • The Interface component of each Service component is contained in the component model.

  • The Endpoint components of each Service component are contained in the component model.

For each Service component in the {services} property of a Description component, the {name} property MUST be unique.

ServiceKey  [ show all ]  [ hide all ]

Let ServiceKey express the QName uniqueness constraint on the Service component:

ServiceKey
ComponentModel2
x, y : serviceComps |
      x.name = y.name x = y
  • No two Service components have the same QName.

ServiceParent  [ show all ]  [ hide all ]

A Service component contains nested Endpoint components. These components MUST have the Service component as their parent.

Let ServiceParent express the constraints on the {parent} properties of the nested components of a Service component:

ServiceParent
ComponentModel2
s : serviceComps;
      e : endpointComps
      e.ids.endpointse.parent = s.id
  • The set of Endpoint components contained by a Service component is exactly the set of Endpoint components that have that Service component as their parent.

ServiceCM  [ show all ]  [ hide all ]

Let ServiceCM be the conjunction of all the component model constraints on Service components.

ServiceCM
      ServiceRI
      ServiceKey
      ServiceParent

2.14.2 XML Representation of Service Component

<description>
  <service
        name="xs:NCName" 
        interface="xs:QName" >
    <documentation />*
    <endpoint />+
    [ <feature /> | <property /> ]*
  </service>
</description>

The XML representation for a Service component is an element information item with the following Infoset properties:

2.14.2.1 name attribute information item with service [owner element]

The name attribute information item together with the targetNamespace attribute information item of the description element information item forms the QName of the service.

The name attribute information item has the following Infoset properties:

  • A [local name] of name

  • A [namespace name] which has no value

The type of the name attribute information item is xs:NCName.

2.14.2.2 interface attribute information item with service [owner element]

The interface attribute information item identifies the interface that the service is an instance of.

The interface attribute information item has the following Infoset properties:

  • A [local name] of interface

  • A [namespace name] which has no value

The type of the interface attribute information item is xs:QName..

2.14.3 Mapping Service's XML Representation to Component Properties

The mapping from the XML Representation of the service element information item (see 2.14.2 XML Representation of Service Component) to the properties of the Service component is as described in Table 2-14.


Table 2-14. Mapping from XML Representation to Service Component Properties
Property Value
{name} The QName whose local name is the actual value of the name attribute information item and whose namespace name is the actual value of the targetNamespace attribute information item of the [parent] description element information item.
{interface} The Interface component resolved to by the actual value of the interface attribute information item (see 2.19 QName resolution).
{endpoints} The Endpoint components corresponding to the endpoint element information items in [children].
{features} The set of Feature components corresponding to the feature element information items in [children], if any.
{properties} The set of Property components corresponding to the property element information items in [children], if any.

2.15 Endpoint

2.15.1 The Endpoint Component

An Endpoint component defines the particulars of a specific endpoint at which a given service is available.

Endpoint components are local to a given Service component; they cannot be referred to by QName (see A.2 Fragment Identifiers).

The {address} property is optional to allow for means other than IRIs to be used, e.g. a WS-Addressing Endpoint Reference [WSA 1.0 Core]. It is also possible that in certain scenarios an address will not be required, in which case this property may not be present.

The properties of the Endpoint component are as follows:

  • {name} REQUIRED. An xs:NCName.

  • {binding} REQUIRED. A Binding component.

  • {address} OPTIONAL. An xs:anyURI. This xs:anyURI MUST be an absolute IRI as defined by [IETF RFC 3987]. If present, the value of this attribute represents the network address at which the service indicated by the parent Service component's {interface} property is offered via the binding referred to by the {binding} property.

  • {features} OPTIONAL. A set of Feature components.

  • {properties} OPTIONAL. A set of Property components.

  • {parent} REQUIRED. The Service component that contains this component in its {endpoints} property.

Endpoint  [ show all ]  [ hide all ]

Let Endpoint be the set of all Endpoint components:

Endpoint
NestedBase
name : NCName
binding : ID
address : OPTIONAL[AbsoluteURI]
EndpointRI  [ show all ]  [ hide all ]

Each component referenced by a Endpoint component must exist in the component model.

Let EndpointRI express the referential integrity constraints on the Endpoint component:

EndpointRI
ComponentModel2
Endpoint |θEndpointendpointComps
      NestedBaseValid
      bindingbindingIds
  • Every Service component satifies the base validity constraints.

  • The Binding component of each Endpoint component is contained in the component model.

  • The Feature components of each Endpoint component are contained in the component model.

  • The Property components of each Endpoint component are contained in the component model.

For each Endpoint component in the {endpoints} property of a Service component, the {name} property MUST be unique.

EndpointKey  [ show all ]  [ hide all ]

Let EndpointKey express this uniqueness constraint on the Endpoint component:

EndpointKey
ComponentModel2
x, y : endpointComps |
      x.parent = y.parent
      x.name = y.name x = y
  • No two Endpoint components contained by the same Service component have the same {name} property.

For each Endpoint component in the {endpoints} property of a Service component, the {binding} property MUST either be a Binding component with an unspecified {interface} property or a Binding component with an {interface} property equal to the {interface} property of the Service component.

EndpointConsistent  [ show all ]  [ hide all ]

Let EndpointConsistent express this consistency constraint:

EndpointConsistent
ComponentModel2
s : serviceComps;
      e : endpointComps ;
      b : bindingComps |
      e.parent = s.id
      e.binding = b.id
      b.interface{s.interface}
  • The Interface component of the Endpoint component's Service component MUST be the same as the Interface component of the Endpoint component's Binding component, if one is specified.

EndpointCM  [ show all ]  [ hide all ]

Let EndpointCM be the conjunction of all the component model constraints on Endpoint components.

EndpointCM
      EndpointRI
      EndpointKey
      EndpointConsistent

2.15.2 XML Representation of Endpoint Component

<description>
  <service>
    <endpoint
          name="xs:NCName" 
          binding="xs:QName"
          address="xs:anyURI"? >
      <documentation />*
      [ <feature /> | <property /> ]*
    </endpoint>+
  </service>
</description>

The XML representation for a Endpoint component is an element information item with the following Infoset properties:

2.15.2.1 name attribute information item with endpoint [owner element]

The name attribute information item together with the targetNamespace attribute information item of the description element information item forms the QName of the endpoint.

The name attribute information item has the following Infoset properties:

  • A [local name] of name .

  • A [namespace name] which has no value.

The type of the name attribute information item is xs:NCName.

2.15.2.2 binding attribute information item with endpoint [owner element]

The binding attribute information item refers, by QName, to a Binding component

The binding attribute information item has the following Infoset properties:

  • A [local name] of binding

  • A [namespace name] which has no value

The type of the binding attribute information item is xs:QName.

2.15.2.3 address attribute information item with endpoint [owner element]

The address attribute information item specifies the address of the endpoint.

The address attribute information item has the following Infoset properties:

  • A [local name] of address

  • A [namespace name] which has no value

The type of the address attribute information item is xs:anyURI.

2.15.2.4 Endpoint extension elements

Endpoint extension elements are used to provide information specific to a particular endpoint in a server. The semantics of such element information items are defined by the specification for those element information items. Such specifications are expected to annotate the Endpoint component with additional properties and specify the mapping from the XML representation to those properties.

2.15.3 Mapping Endpoint's XML Representation to Component Properties

The mapping from the XML Representation of the endpoint element information item (see 2.15.2 XML Representation of Endpoint Component) to the properties of the Endpoint component is as described in Table 2-15.


Table 2-15. Mapping from XML Representation to Endpoint Component Properties
Property Value
{name} The actual value of the name attribute information item.
{binding} The Binding component resolved to by the actual value of the binding attribute information item (see 2.19 QName resolution ).
{address} The actual value of the address attribute information item if present, otherwise empty.
{features} The set of Feature components corresponding to the feature element information items in [children], if any.
{properties} The set of Property components corresponding to the property element information items in [children], if any.
{parent} The Service component corresponding to the service element information item in [parent].

2.16 XML Schema 1.0 Simple Types Used in the Component Model

The XML Schema 1.0 simple types [XML Schema: Datatypes] used in this specification are:

  • xs:token

  • xs:NCName

  • xs:anyURI

  • xs:QName

  • xs:boolean

NCName  [ show all ]  [ hide all ]

Let NCName be set of actual values of xs:NCName:

[NCName]
URI...
URI  [ show all ]  [ hide all ]

Let URI be the set of actual values of xs:anyURI:

[URI]
AbsoluteURI  [ show all ]  [ hide all ]

Let AbsoluteURI be the subset of absolute URIs (see [IETF RFC 3986]):

AbsoluteURI :URI
See URI.
QName  [ show all ]  [ hide all ]

Let QName be the set of actual values of xs:QName:

  • Let namespaceName be the namespace name.

  • Let localName be the local name.

QName
namespaceName : AbsoluteURI
localName : NCName
Boolean  [ show all ]  [ hide all ]

Let Boolean be the set of actual values of xs:boolean:

Boolean ::= True | False

2.17 Equivalence of Components

Two component instances of the same type are considered equivalent if, for each property of the first component, there is a corresponding property with an equivalent value on the second component, and vice versa.

Instances of properties of the same type are considered equivalent if their values are equivalent.

  • For values of a simple type (see 2.16 XML Schema 1.0 Simple Types Used in the Component Model) this means that they contain the same values. For instance, two string values are equivalent if they contain the same sequence of Unicode characters, as described in [Character Model for the WWW]

  • Values which are references to other components are considered equivalent when they refer to equivalent components (as determined above).

  • List-based values are considered equivalent if they have the same length and their elements at corresponding positions are equivalent.

  • Finally, set-based values are considered equivalent if for each value in the first, there is an equivalent value in the second, and vice versa.

Extension properties which are not string values, sets of strings or references MUST describe their values' equivalence rules.

Because different top-level components (e.g., Interface, Binding, and Service) are required to have different names, it is possible to determine whether two top-level components of a given type are equivalent by examining their {name} property.

2.18 Symbol Spaces

This specification defines three symbol spaces, one for each top-level component type (Interface, Binding and Service).

Within a symbol space, all qualified names (that is, the {name} property) are unique. Between symbol spaces, the names need not be unique. Thus it is perfectly coherent to have, for example, a binding and an interface that have the same name.

When XML Schema is being used as one of the type systems for a WSDL 2.0 description, then six other symbol spaces also exist, one for each of: global element declarations, global attribute declarations, named model groups, named attribute groups, type definitions and key constraints, as defined by [XML Schema: Structures]. Other type systems may define additional symbol spaces.

2.19 QName resolution

In its serialized form WSDL 2.0 makes significant use of references between components. Such references are made using the Qualified Name, or QName, of the component being referred to. QNames are a tuple, consisting of two parts; a namespace name and a local name. The namespace name for a component is represented by the value of the targetNamespace attribute information item of the [parent] description element information item and the local name is represented by the {name} property of the component.

QName references are resolved by looking in the appropriate property of the Description component. For example, to resolve a QName of an interface (as referred to by the interface attribute information item on a binding), the {interfaces} property of the Description component would be inspected.

If the appropriate property of the Description component does not contain a component with the required QName then the reference is a broken reference. It is an error for a Description component to have such broken references.

2.20 Comparing URIs and IRIs

This specification uses absolute URIs and IRIs to identify several components (for example, features and properties) and components characteristics (for example, operation message exchange patterns and styles). When such absolute URIs and IRIs are being compared to determine equivalence (see 2.17 Equivalence of Components) they MUST be compared character-by-character as indicated in [IETF RFC 3987].

3. Types

<description>
  <types>
    <documentation />*
    [ <xs:import namespace="xs:anyURI" schemaLocation="xs:anyURI"? /> |
      <xs:schema targetNamespace="xs:anyURI" /> |
      other extension elements ]*
  </types>
</description>

The content of messages and faults may be constrained using type system components. These constraints are based upon a specific data model, and expressed using a particular schema language.

Although a variety of data models can be accommodated (through WSDL 2.0 extensions), this specification only defines a means of expressing constraints based upon the XML Infoset [XML Information Set]. Furthermore, although a number of alternate schema languages can be used to constrain the XML Infoset (as long as they support the semantics of either inlining or importing schema), this specification only defines the use of XML Schema [XML Schema: Structures], [XML Schema: Datatypes].

Specifically, the {element declarations} and {type definitions} properties of the Description component are collections of imported and inlined schema components that describe Infoset element information items.

When extensions are used to enable the use of a non-Infoset data model, or a non-Schema constraint language, the wsdl:required attribute information item MAY be used to require support for that extension.

Note:

Support for the W3C XML Schema [XML Schema: Structures], [XML Schema: Datatypes] is included in the conformance criteria for WSDL 2.0 documents (see 3.1 Using W3C XML Schema Description Language ).

The schema components contained in the {element declarations} property of the Description component provide the type system used for Interface Message Reference and Interface Fault components. Interface Message Reference components indicate their structure and content by using the standard attribute information items element , or for alternate schema languages in which these concepts do not map well, by using alternative attribute information item extensions. Interface Fault components behave similarly. Such extensions should define how they reference type system components. Such type system components MAY appear in additional collection properties on the Description component.

The schema components contained in the {type definitions} property of the Description component provide the type system used for constraining the values of properties described by Property components. Extensions in the form of attribute information items can be used to refer to constraints (type definitions or analogous constructs) described using other schema languages or type systems. Such components MAY appear in additional collection properties on the Description component.

The types element information item encloses data type definitions, based upon the XML Infoset, used to define messages and has the following Infoset properties:

3.1 Using W3C XML Schema Description Language

XML Schema MAY be used as the schema language via import or inlining.

A WSDL 2.0 document MUST NOT refer to XML Schema components in a given namespace unless an xs:import or xs:schema element information item for that namespace is present or the namespace is the XML Schema namespace which contains built-in types as defined in XML Schema Part 2: Datatypes Second Edition [XML Schema: Datatypes]. That is, using the xs:import or xs:schema element information item is a necessary condition for making XML Schema components, other than the built-in components, referenceable within a WSDL 2.0 document.

Table 3-1 summarizes the referenceability of schema components.


Table 3-1. Referenceability of schema components
XML Representation Referenceability of XML Schema Components
Including description description/include XML Schema components in the included Description component's {element declarations} and {type definitions} properties are referenceable.
Importing description description/import None of the XML Schema Components in the imported Description component are referenceable.
Importing XML Schema description/types/xs:import Element Declaration and Type Definition components in the imported namespace are referenceable.
Inlined XML Schema description/types/xs:schema Element Declaration and Type Definition components in the inlined XML Schema are referenceable.

3.1.1 Importing XML Schema

Importing an XML Schema uses the syntax and semantics of the xs:import mechanism defined by XML Schema [XML Schema: Structures], [XML Schema: Datatypes], with the differences defined in this and the following section. The schema components defined in the imported namespace are referenceable by QName (see 2.19 QName resolution). Only components in the imported namespace are referenceable in the WSDL 2.0 document.

A child element information item of the types element information item is defined with the Infoset properties as follows:

  • A [local name] of "import".

  • A [namespace name] of "http://www.w3.org/2001/XMLSchema".

  • One or two attribute information items as follows:

    • A REQUIRED namespace attribute information item as described below.

    • An OPTIONAL schemaLocation attribute information item as described below.

3.1.1.1 namespace attribute information item

The namespace attribute information item defines the namespace of the element declarations and type definitions imported from the referenced schema. The referenced schema MUST contain a targetNamespace attribute information item on its xs:schema element information item. The value of the targetNamespace attribute information item of the xs:schema element information item of an imported schema MUST equal the value of the namespace of the import element information item in the importing WSDL 2.0 document. Note that a WSDL 2.0 document must not import a schema that does not have a targetNamespace attribute information item on its xs:schema element information item. Such schemas must first be included (using xs:include ) in a schema that contains a targetNamespace attribute information item on its xs:schema element information item, which can then be either imported or inlined in the WSDL 2.0 document.

The namespace attribute information item has the following Infoset properties:

  • A [local name] of namespace

  • A [namespace name] which has no value.

The type of the namespace attribute information item is xs:anyURI.

3.1.1.2 schemaLocation attribute information item

The schemaLocation attribute information item, if present, provides a hint to the XML Schema processor as to where the schema may be located. Caching and cataloging technologies may provide better information than this hint. The schemaLocation attribute information item has the following Infoset properties:

  • A [local name] of schemaLocation.

  • A [namespace name] which has no value.

The type of the schemaLocation attribute information item is xs:anyURI.

It is an error if a QName is not resolved (see 2.19 QName resolution). When resolving QNames references for schema definitions, the namespace MUST be imported by the referring WSDL 2.0 document. If the namespace so referenced is contained in an inline schema, it MAY be imported without a schemaLocation attribute, so long as the inline schema has been resolved in the current component model.

3.1.2 Inlining XML Schema

Inlining an XML schema uses the existing top-level xs:schema element information item defined by XML Schema [XML Schema: Structures]. It may be viewed as simply cutting and pasting an existing schema document to a location inside the types element information item.

The schema components defined and declared in the inlined schema document are referenceable by QName (see 2.19 QName resolution). Only components defined and declared in the schema itself and components included by it via xs:include are referenceable. Specifically components that the schema imports via xs:import are NOT referenceable.

Similarly, components defined in an inlined XML schema are NOT automatically referenceable within WSDL 2.0 document that imported (using wsdl:import ) the WSDL 2.0 document that inlines the schema (see 4.2 Importing Descriptions for more details). For this reason, it is recommended that XML schema documents intended to be shared across several WSDL 2.0 documents be placed in separate XML schema documents and imported using xs:import , rather than inlined inside a WSDL 2.0 document.

Inside an inlined XML schema, the xs:import and xs:include element information items MAY be used to refer to other XML schemas inlined in the same or other WSDL 2.0 document, provided that an appropriate value, such as a fragment identifier (see [XML Schema: Structures] 4.3.1) is specified for their schemaLocation attribute information items. For xs:import , the schemaLocation attribute is not required so long as the namespace has been resolved in the current component model. The semantics of such element information items are governed solely by the XML Schema specification [XML Schema: Structures].

A WSDL 2.0 document MAY inline two or more schemas from the same targetNamespace . For example, two or more inlined schemas may have the same targetNamespace provided that they do not define the same elements or types. A WSDL 2.0 document MUST NOT define the same element or type in more than one inlined schema. Note that it is the responsibility of the underlying XML Schema processor to sort out a coherent set of schema components.

The xs:schema element information item has the following Infoset properties:

  • A [local name] of schema.

  • A [namespace name] of "http://www.w3.org/2001/XMLSchema".

  • A REQUIRED targetNamespace attribute information item, amongst its [attributes] as described below.

  • Additional OPTIONAL attribute information items as specified for the xs:schema element information item by the XML Schema specification.

  • Zero or more child element information items as specified for the xs:schema element information item by the XML Schema specification.

3.1.2.1 targetNamespace attribute information item

The targetNamespace attribute information item defines the namespace of the element declarations and type definitions inlined in its [owner element] xs:schema element information item. WSDL 2.0 modifies the XML Schema definition of the xs:schema element information item to make this attribute information item required. The xs:schema element information item MUST contain a targetNamespace attribute information item. The targetNamespace attribute information item has the following Infoset properties:

  • A [local name] of targetNamespace.

  • A [namespace name] which has no value.

The type of the targetNamespace attribute information item is xs:anyURI.

3.1.3 References to Element Declarations and Type Definitions

Whether inlined or imported, the element declarations present in a schema are referenceable from an Interface Message Reference or Interface Fault component. Similarly, regardless of whether they are inlined or imported, the type definitions present in a schema are referenceable from a Property component.

A named, global xs:element declaration is referenceable from the element attribute information item of an input , output or fault element information item. The QName is constructed from the targetNamespace of the schema and the value of the name attribute information item of the xs:element element information item. An element attribute information item MUST NOT refer to a global xs:simpleType or xs:complexType definition.

A named, global xs:simpleType or xs:complexType declaration is referenceable from the constraint attribute information item of property element information item. The QName is constructed from the targetNamespace of the schema and the value of the name attribute information item of the xs:simpleType or xs:complexType element information item. A constraint attribute information item MUST NOT refer to a global xs:element definition.

3.2 Using Other Schema Languages

Since it is unreasonable to expect that a single schema language can be used to describe all possible Interface Message Reference, Interface Fault and Property component contents and their constraints, WSDL 2.0 allows alternate schema languages to be specified via extensibility elements. An extensibility element information item MAY appear under the types element information item to identify the schema language employed, and to locate the schema instance defining the grammar for Interface Message Reference and Interface Fault components or the constraint for Property components. Depending upon the schema language used, an element information item MAY be defined to allow inlining, if and only if the schema language can be expressed in XML.

A specification of extension syntax for an alternative schema language MUST include the declaration of an element information item, intended to appear as a child of the wsdl:types element information item, which references, names, and locates the schema instance (an “import” element information item). The extension specification SHOULD, if necessary, define additional properties of the Description component (and extensibility attributes) to hold the components of the referenced type system. It is expected that additional extensibility attributes for Interface Message Reference, Interface Fault and Property components will also be defined, along with a mechanism for resolving the values of those attributes to a particular imported type system component.

A specification of extension syntax for an alternative schema language MUST use a namespace that is different than the namespace of XML Schema. The namespace of the alternative schema language is used for element information items that are children of the wsdl:types element information item and for any extensibility attribute information items that appear on other components. The namespace used for an alternate schema language MUST be an absolute IRI.

See [Alternative Schema Languages Support] for examples of using other schema languages. These examples reuse the {element declarations} property of the Description component and the element attribute information items of the wsdl:input , wsdl:output and wsdl:fault element information items.

Note:

This specification does not define the behavior of a WSDL 2.0 document that uses multiple schema languages for describing type system components simultaneously.

3.3 Describing Messages that Refer to Services and Endpoints

Web services may exchange messages that refer to other Web services or Web service endpoints. If the interface or binding of these referenced services or endpoints are known at description time, then it may be useful to include this information in the WSDL 2.0 document that describes the Web service. WSDL 2.0 provides two global attribute information items, wsdlx:interface and wsdlx:binding that may be used to annotate XML Schema components or components from other type description languages.

WSDL 2.0 defines the use of these global attribute information items to annotate XML Schema components that use the xs:anyURI simple type in an element information item or attribute information item for endpoint addresses that correspond to the {address} property of the Endpoint component. However, the use of these global attribute information items is not limited to simple types based on xs:anyURI . They may be used for any other types that are used to refer to Web services or Web service endpoints, e.g. a WS-Addressing Endpoint Reference [WSA 1.0 Core]. See the primer [WSDL 2.0 Primer] for more information and examples.

3.3.1 wsdlx:interface attribute information item

WSDL 2.0 provides a global attribute information item with the following Infoset properties:

  • A [local name] of interface .

  • A [namespace name] of " http://www.w3.org/2006/01/wsdl-extensions ".

The type of the wsdlx:interface attribute information item is an xs:QName that specifies the {name} property of an Interface component.

3.3.2 wsdlx:binding attribute information item

WSDL 2.0 provides a global attribute information item with the following Infoset properties:

  • A [local name] of binding .

  • A [namespace name] of " http://www.w3.org/2006/01/wsdl-extensions ".

The type of the wsdlx:binding attribute information item is an xs:QName that specifies the {name} property of an Binding component.

3.3.3 wsdlx:interface and wsdlx:binding Consistency

The wsdlx:interface and wsdlx:binding attributes may be used either independently or together. If wsdlx:interface and wsdlx:binding are used together then they MUST satisfy the same consistency rules that apply to the {interface} property of a Service component and the {binding} property of a nested Endpoint component, that is either the binding refers the interface of the service or the binding refers to no interface.

3.3.4 Use of wsdlx:interface and wsdlx:binding with xs:anyURI

wsdlx:interface and wsdlx:binding may be used to describe element information items and attribute information items whose type is xs:anyURI or a restriction of it, to describe messages that contain the {address} property of an Endpoint. This is accomplished by including the wsdlx:interface and/or wsdlx:binding attribute information item in the xs:element , xs:simpleType , or xs:attribute element information item of the corresponding XML Schema component.

4. Modularizing WSDL 2.0 descriptions

This specification provides two mechanisms, described in this section, for modularizing WSDL 2.0 descriptions. These mechanisms help to make WSDL 2.0 descriptions clearer by allowing separation of the various components of a description. Such separation could be performed according to the level of abstraction of a given set of components, or according to the namespace affiliation required of a given set of components or according to some other grouping such as application applicability.

Both mechanisms work at the level of WSDL 2.0 components and NOT at the level of XML Information Sets or XML 1.0 serializations.

4.1 Including Descriptions

<description>
  <include
        location="xs:anyURI" >
    <documentation />*
  </include>
</description>

The WSDL 2.0 include element information item allows for the separation of different components of a service definition, belonging to the same target namespace, into independent WSDL 2.0 documents.

The WSDL 2.0 include element information item is modeled after the XML Schema include element information item (see [XML Schema: Structures], section 4.2.3 "References to schema components in the same namespace"). Specifically, it can be used to include components from WSDL 2.0 descriptions that share a target namespace with the including description. Components in the transitive closure of the included WSDL 2.0 documents become part of the Description component of the including WSDL 2.0 document. The included components can be referenced by QName. Note that because all WSDL 2.0 descriptions have a target namespace, no-namespace includes (sometimes known as “chameleon includes”) never occur in WSDL 2.0.

A mutual include is direct inclusion by one WSDL 2.0 document of another WSDL 2.0 document which includes the first. A circular include achieves the same effect with greater indirection (A s B includes C includes A, for instance). Multiple inclusion of a single WSDL 2.0 document resolves to a single set of components. Mutual, multiple, and circular includes are explicitly permitted, and do not represent multiple redefinitions of the same components. Multiple inclusion of a single WSDL 2.0 document has the same meaning as including it only once.

The include element information item has:

  • A [local name] of include .

  • A [namespace name] of "http://www.w3.org/2006/01/wsdl".

  • One or more attribute information items amongst its [attributes] as follows:

  • Zero or more element information item amongst its [children], as follows:

    • Zero or more documentation element information items (see 5. Documentation).

    • Zero or more namespace-qualified element information items whose [namespace name] is NOT "http://www.w3.org/2006/01/wsdl".

4.1.1 location attribute information item with include [owner element]

The location attribute information item has the following Infoset properties:

  • A [local name] of location .

  • A [namespace name] which has no value.

A location attribute information item is of type xs:anyURI . Its actual value is the location of some information about the namespace identified by the targetNamespace attribute information item of the containing description element information item.

It is an error if the IRI indicated by location does not resolve to a WSDL 2.0 document.

The actual value of the targetNamespace attribute information item of the included WSDL 2.0 document MUST match the actual value of the targetNamespace attribute information item of the description element information item which is the [parent] of the include element information item.

4.2 Importing Descriptions

<description>
  <import
        namespace="xs:anyURI" location="xs:anyURI"? >
    <documentation />*
  </import>
</description>

Every top-level WSDL 2.0 component is associated with a target namespace. On its wsdl:description element information item, a WSDL 2.0 document carries a targetNamespace attribute information item that associates the document with a target namespace. This section describes the syntax and mechanisms by which references may be made from within a WSDL 2.0 document to components not within the document's target namespace. In addition to this syntax, there is an optional facility for suggesting the IRI of a WSDL 2.0 document containing definition components from that foreign target namespace.

The WSDL 2.0 import element information item is modeled after the XML Schema import element information item (see [XML Schema: Structures], section 4.2.3 "References to schema components across namespaces"). Specifically, it can be used to import components from WSDL descriptions that do not share a target namespace with the importing document. The WSDL 2.0 import element information item identifies namespaces used in foreign references. The existence of the WSDL 2.0 import element information item signals that the WSDL 2.0 document may contain references to foreign components. The wsdl:import element information item is therefore like a forward declaration for other namespaces.

As with XML schema, each WSDL 2.0 document making references to components in a given (foreign) namespace MUST have a wsdl:import element information item for that namespace (but not necessarily providing a location attribute information item identifying the WSDL 2.0 document in which the referenced component is declared). In other respects, the visibility of components is pervasive; if two WSDL 2.0 documents import the same namespace then they will have access to the same components from the imported namespace (i.e. regardless of which, if any, location attribute information item values are provided on the respective wsdl:import element information items.)

Using the wsdl:import element information item is a necessary condition for making components from another namespace available to a WSDL 2.0 document. That is, a WSDL 2.0 document can only refer to components in a namespace other than its own target namespace if the WSDL 2.0 document contains an wsdl:import element information item for that foreign namespace.

This specification does not preclude repeating the wsdl:import element information item for the same value of the namespace attribute information item as long as they provide different values for the location attribute information item. Repeating the wsdl:import element information item for the same namespace value MAY be used as a way to provide alternate locations to find information about a given namespace.

Furthermore, this specification DOES NOT require the location attribute information item to be dereferenceable. If it is not dereferenceable then no information about the imported namespace is provided by that wsdl:import element information item. It is possible that such lack of information can cause QNames in other parts of a WSDL 2.0 Description component to become broken references (see 2.19 QName resolution). Such broken references are not errors of the wsdl:import element information item but rather QName resolution errors which must be detected as described in 2.19 QName resolution.

The import element information item has the following Infoset properties:

  • A [local name] of import .

  • A [namespace name] of "http://www.w3.org/2006/01/wsdl".

  • One or more attribute information items amongst its [attributes] as follows:

  • Zero or more element information items amongst its [children], as follows:

    • Zero or more documentation element information items (see 5. Documentation).

    • Zero or more namespace-qualified element information items whose [namespace name] is NOT "http://www.w3.org/2006/01/wsdl".

4.2.1 namespace attribute information item

The namespace attribute information item has the following Infoset properties:

  • A [local name] of namespace .

  • A [namespace name] which has no value.

The namespace attribute information item is of type xs:anyURI . Its actual value indicates that the containing WSDL 2.0 document MAY contain qualified references to WSDL 2.0 definitions in that namespace (via one or more prefixes declared with namespace declarations in the normal way). This value MUST NOT match the actual value of targetNamespace attribute information item in the enclosing WSDL 2.0 document. If the location attribute in the import element information item references a WSDL 2.0 document, then the actual value of the namespace attribute information item MUST be identical to the actual value of the targetNamespace attribute information item in the referenced WSDL 2.0 document.

4.2.2 location attribute information item with import [owner element]

The location attribute information item has the following Infoset properties:

  • A [local name] of location .

  • A [namespace name] which has no value.

The location attribute information item is of type xs:anyURI . Its actual value, if present, gives a hint as to where a serialization of a WSDL 2.0 document with definitions for the imported namespace can be found.

The location attribute information item is optional. This allows WSDL 2.0 components to be constructed from information other than serialized XML 1.0 or a WSDL 2.0 document. It also allows the development of WSDL 2.0 processors that have a prior (i.e., built-in) knowledge of certain namespaces.

5. Documentation

<documentation>
  [extension elements]*
</documentation>

WSDL 2.0 uses the optional documentation element information item as a container for human readable and/or machine processable documentation. The content of the element information item is arbitrary character information items and element information items ("mixed" content in XML Schema[XML Schema: Structures]). The documentation element information item is allowed inside any WSDL 2.0 element information item.

Like other element information items in the "http://www.w3.org/2006/01/wsdl" namespace, the documentation element information item allows qualified attribute information items whose [namespace name] is not "http://www.w3.org/2006/01/wsdl". The xml:lang attribute (see [XML 1.0]) MAY be used to indicate the language used in the contents of the documentation element information item.

The documentation element information item has:

6. Language Extensibility

In addition to extensibility implied by the Feature and Property components described above, the schema for WSDL 2.0 has a two-part extensibility model based on namespace-qualified elements and attributes. An extension is identified by the QName consisting of its namespace IRI and its element name. The meaning of an extension SHOULD be defined (directly or indirectly) in a document that is available at its namespace IRI.

6.1 Element based Extensibility

WSDL 2.0 allows extensions to be defined in terms of element information items. Where indicated herein, WSDL 2.0 allows namespace-qualified element information items whose [namespace name] is NOT "http://www.w3.org/2006/01/wsdl" to appear among the [children] of specific element information items whose [namespace name] is "http://www.w3.org/2006/01/wsdl". Such element information items MAY be used to annotate WSDL 2.0 constructs such as interface, operation, etc.

It is expected that extensions will want to add to the existing properties of components in the component model. The specification for an extension element information item should include definitions of any such properties and the mapping from the XML representation of the extension to the properties in the component model.

The WSDL 2.0 schema also defines a base type for use by extensibility elements. Example 6-1 shows the type definition. The use of this type as a base type is optional. The element declarations which serve as the heads of the defined substitution groups are all of type "xs:anyType".

Extensibility elements are commonly used to specify some technology-specific binding. They allow innovation in the area of network and message protocols without having to revise the base WSDL 2.0 specification. WSDL 2.0 recommends that specifications defining such protocols also define any necessary WSDL 2.0 extensions used to describe those protocols or formats.

Example 6-1. Base type for extensibility elements

<xs:complexType name='ExtensibilityElement' abstract='true' >
  <xs:attribute ref='wsdl:required' use='optional' />
</xs:complexType>
          
          

6.1.1 Mandatory extensions

Extension elements can be marked as mandatory by annotating them with a wsdl:required attribute information item (see 6.1.2 required attribute information item) with a value of "true". A mandatory extension is an extension that MAY change the meaning of the element to which it is attached, such that the meaning of that element is no longer governed by this specification. Instead, the meaning of an element containing a mandatory extension is governed by the meaning of that extension. Thus, the definition of the element's meaning is delegated to the specification that defines the extension.

An extension that is NOT marked as mandatory MUST NOT invalidate the meaning of any part of the WSDL 2.0 document. Thus, a NON-mandatory extension merely provides additional description of capabilities of the service. This specification does not provide a mechanism to mark extension attributes as being required. Therefore, all extension attributes are NON-mandatory.

Note:

A mandatory extension is considered mandatory because it has the ability to change the meaning of the element to which it is attached. Thus, the meaning of the element may not be fully understood without understanding the attached extension. A NON-mandatory extension, on the other hand, can be safely ignored without danger of misunderstanding the rest of the WSDL 2.0 document.

If a WSDL 2.0 document declares an extension, Feature or Property as optional (i.e., NON-mandatory), then the Web service MUST NOT assume that the client supports that extension, Feature or Property, unless the Web service knows (through some other means) that the client has in fact elected to engage and support that extension, Feature or Property.

Note:

A key purpose of an extension is to formally indicate (i.e., in a machine-processable way) that a particular feature or convention is supported or required. This enables toolkits that understand the extension to engage it automatically, while toolkits that do not yet understand a required extension may be able to flag it to an operator for manual support.

If a Web service requires the client to follow a particular convention that is likely to be automatable in WSDL 2.0 toolkits, then that convention SHOULD be indicated in the WSDL 2.0 document as a wsdl:required extension, rather than just being conveyed out of band, even if that convention is not currently implemented in WSDL 2.0 toolkits.

This practice will help prevent interoperability problems that could arise if one toolkit requires a particular convention that is not indicated in the WSDL 2.0 document, while another toolkit does not realize that that convention is required. It will also help facilitate future automatic processing by WSDL 2.0 toolkits.

On the other hand, a client MAY engage an extension, Feature or Property that is declared as optional in the WSDL 2.0 document. Therefore, the Web service MUST support every extension, Feature or Property that is declared as optional in the WSDL 2.0 document, in addition to supporting every extension, Feature or Property that is declared as mandatory.

Note:

If finer-grain, direction-sensitive control of extensions, Features or Properties is desired, then such extensions, Features or Properties may be designed in a direction-sensitive manner (from the client or from the Web service) so that either direction may be separately marked required or optional. For example, instead of defining a single extension that governs both directions, two extensions could be defined -- one for each direction.

6.1.2 required attribute information item

WSDL 2.0 provides a global attribute information item with the following Infoset properties:

  • A [local name] of required .

  • A [namespace name] of "http://www.w3.org/2006/01/wsdl".

The type of the required attribute information item is xs:boolean. Its default value is "false" (hence extensions are NOT required by default).

6.2 Attribute-based Extensibility

WSDL 2.0 allows qualified attribute information items whose [namespace name] is NOT "http://www.w3.org/2006/01/wsdl" to appear on any element information item whose namespace name IS "http://www.w3.org/2006/01/wsdl". Such attribute information items can be used to annotate WSDL 2.0 constructs such as interfaces, bindings, etc.

WSDL 2.0 does not provide a mechanism for marking extension attribute information items as mandatory.

6.3 Extensibility Semantics

As indicated above, it is expected that the presence of extensibility elements and attributes will result in additional properties appearing in the component model.

The presence of an optional extensibility element or attribute MAY therefore augment the semantics of a WSDL 2.0 document in ways that do not invalidate the existing semantics. However, the presence of a mandatory extensibility element MAY alter the semantics of a WSDL 2.0 document in ways that invalidate the existing semantics.

Extensibility elements SHOULD NOT alter the existing semantics in ways that are likely to confuse users.

Note:

However, once the client and service both know that an optional feature has been engaged (because the service has received a message explicitly engaging that feature, for example), then the semantics of that feature supersede what the WSDL 2.0 document indicated. For example, the WSDL 2.0 document may have specified an XML message schema to be used, but also indicated an optional security feature that encrypts the messages. If the security feature is engaged, then the encrypted messages will no longer conform to the specified message schema (until they are decrypted).

Note:

Authors of extensibility elements should make sure to include in the specification for such elements a clear statement of the requirements for document conformance (see 1.2 Document Conformance).

7. Locating WSDL 2.0 Documents

As an XML vocabulary, WSDL documents, WSDL fragments or references to WSDL components -via QNames- MAY appear within other XML documents. This specification defines a global attribute, wsdlLocation , to help with QName resolution (see 2.19 QName resolution). This attribute allows an element that contains such references to be annotated to indicate where the WSDL for a namespace (or set of namespaces) can be found. In particular, this attribute is expected to be useful when using service references in message exchanges.

The wsdlLocation global attribute is defined in the namespace "http://www.w3.org/2006/01/wsdl-instance" (hereafter referred to as "wsdli:wsdlLocation", for brevity). This attribute MAY appear on any XML element which allows attributes from other namespaces to occur. It MUST NOT appear on a wsdl:description element or any of its children/descendants.

A normative XML Schema [XML Schema: Structures], [XML Schema: Datatypes] document for the "http://www.w3.org/2006/01/wsdl-instance" namespace can be found at http://www.w3.org/2006/01/wsdl-instance.

7.1 wsdli:wsdlLocation attribute information item

WSDL 2.0 provides a global attribute information item with the following Infoset properties:

  • A [local name] of wsdlLocation .

  • A [namespace name] of "http://www.w3.org/2006/01/wsdl-instance".

The type of the wsdlLocation attribute information item is a list xs:anyURI (of even length). Its actual value MUST be a list of pairs of IRIs; where the first IRI of a pair, which MUST be an absolute IRI as defined in [IETF RFC 3987], indicates a WSDL 2.0 (or 1.1) namespace name, and, the second a hint as to the location of a WSDL 2.0 document defining WSDL 2.0 components (or WSDL 1.1 elements [WSDL 1.1]) for that namespace name. The second IRI of a pair MAY be absolute or relative.

8. Conformance

This sections describes how this specification conforms to other specifications. At present, only one other specification, XML Information Set, is included here. Refer to 1.2 Document Conformance for a description of the criteria that Web service description documents must satisfy in order to conform to this specification.

8.1 XML Information Set Conformance

This specification conforms to the [XML Information Set]. The following information items MUST be present in the input Infosets to enable correct processing of WSDL 2.0 documents:

  • Document Information Items with [children] and [base URI] properties.

  • Element Information Items with [namespace name], [local name], [children], [attributes], [base URI] and [parent] properties.

  • Attribute Information Items with [namespace name], [local name] and [normalized value] properties.

  • Character Information Items with [character code], [element content whitespace] and [parent] properties.

9. XML Syntax Summary (Non-Normative)

<description targetNamespace="xs:anyURI" >
  <documentation />?

  <import namespace="xs:anyURI" location="xs:anyURI"? >
    <documentation />*
  </import>*

  <include location="xs:anyURI" >
    <documentation />*
  </include>*

  <types>
    <documentation />*
    
      [ <xs:import namespace="xs:anyURI" schemaLocation="xs:anyURI"? /> |
        <xs:schema targetNamespace="xs:anyURI" /> |
        other extension elements ]*
  </types>

  <interface name="xs:NCName" extends="list of xs:QName"? styleDefault="list of xs:anyURI"? >
    <documentation />*

    <fault name="xs:NCName" element="xs:QName"? >
      <documentation />*

      <feature ... />*

      <property ... />*
    </fault>*

    <operation name="xs:NCName" pattern="xs:anyURI" style="list of xs:anyURI"? >
      <documentation />*

      <input messageLabel="xs:NCName"? element="union of xs:QName, xs:token"? >
        <documentation />*

        <feature ... />*

        <property ... />*
      </input>*

      <output messageLabel="xs:NCName"? element="union of xs:QName, xs:token"? >
        <documentation />*

        <feature ... />*

        <property ... />*
      </output>*

      <infault ref="xs:QName" messageLabel="xs:NCName"? >
        <documentation />*

        <feature ... />*

        <property ... />*
      </infault>*

      <outfault ref="xs:QName" messageLabel="xs:NCName"? >
        <documentation />*

        <feature ... />*

        <property ... />*
      </outfault>*

      <feature ... />*

      <property ... />*
    </operation>*

    <feature ref="xs:anyURI" required="xs:boolean"? >
      <documentation />*
    </feature>*

    <property ref="xs:anyURI" >
      <documentation />*

      <value> xs:anyType </value>?
      
      <constraint> xs:QName </constraint>?
    </property>*
  </interface>*

  <binding name="xs:NCName" interface="xs:QName"? type="xs:anyURI" >
    <documentation />*

    <fault ref="xs:QName" >
      <documentation />*

      <feature ... />*

      <property ... />*
    </fault>*

    <operation ref="xs:QName" >
      <documentation />*

      <input messageLabel="xs:NCName"? >
        <documentation />*

        <feature ... />*

        <property ... />*
      </input>*

      <output messageLabel="xs:NCName"? >
        <documentation />*

        <feature ... />*

        <property ... />*
      </output>*

      <infault ref="xs:QName" messageLabel="xs:NCName"? >
        <documentation />*

        <feature ... />*

        <property ... />*
      </infault>*

      <outfault ref="xs:QName" messageLabel="xs:NCName"? >
        <documentation />*

        <feature ... />*

        <property ... />*
      </outfault>*

      <feature ... />*

      <property ... />*
    </operation>*

    <feature ... />*

    <property ... />*
  </binding>*

  <service name="xs:NCName" interface="xs:QName" >
    <documentation />*

    <endpoint name="xs:NCName" binding="xs:QName" address="xs:anyURI"? >
      <documentation />*

      <feature ... />*

      <property ... />*
    </endpoint>*

    <feature ... />*

    <property ... />*
  </service>*
</description>

10. References

10.1 Normative References

[IETF RFC 2119]
Key words for use in RFCs to Indicate Requirement Levels, S. Bradner, Author. Internet Engineering Task Force, June 1999. Available at http://www.ietf.org/rfc/rfc2119.txt.
[IETF RFC 3986]
Uniform Resource Identifiers (URI): Generic Syntax, T. Berners-Lee, R. Fielding, L. Masinter, Authors. Internet Engineering Task Force, January 2005. Available at http://www.ietf.org/rfc/rfc3986.txt.
[IETF RFC 3987]
Internationalized Resource Identifiers (IRIs), M. Duerst, M. Suignard, Authors. Internet Engineering Task Force, January 2005. Available at http://www.ietf.org/rfc/rfc3987.txt.
[XML 1.0]
Extensible Markup Language (XML) 1.0 (Third Edition), T. Bray, J. Paoli, C. M. Sperberg-McQueen, E. Maler, and F. Yergeau, Editors. World Wide Web Consortium, 4 February 2004. This version of the XML 1.0 Recommendation is http://www.w3.org/TR/2004/REC-xml-20040204/. The latest version of "Extensible Markup Language (XML) 1.0" is available at http://www.w3.org/TR/REC-xml.
[XML Information Set]
XML Information Set (Second Edition), J. Cowan and R. Tobin, Editors. World Wide Web Consortium, 4 February 2004. This version of the XML Information Set Recommendation is http://www.w3.org/TR/2004/REC-xml-infoset-20040204. The latest version of XML Information Set is available at http://www.w3.org/TR/xml-infoset.
[XML Namespaces]
Namespaces in XML, T. Bray, D. Hollander, and A. Layman, Editors. World Wide Web Consortium, 14 January 1999. This version of the Namespaces in XML Recommendation is http://www.w3.org/TR/1999/REC-xml-names-19990114. The latest version of Namespaces in XML is available at http://www.w3.org/TR/REC-xml-names.
[XML Schema: Structures]
XML Schema Part 1: Structures, H. Thompson, D. Beech, M. Maloney, and N. Mendelsohn, Editors. World Wide Web Consortium, 28 October 2004. This version of the XML Schema Part 1 Recommendation is http://www.w3.org/TR/2004/REC-xmlschema-1-20041028. The latest version of XML Schema Part 1 is available at http://www.w3.org/TR/xmlschema-1.
[XML Schema: Datatypes]
XML Schema Part 2: Datatypes, P. Byron and A. Malhotra, Editors. World Wide Web Consortium, 28 October 2004. This version of the XML Schema Part 2 Recommendation is http://www.w3.org/TR/2004/REC-xmlschema-2-20041028. The latest version of XML Schema Part 2 is available at http://www.w3.org/TR/xmlschema-2.
[RFC 3023]
IETF "RFC 3023: XML Media Types", M. Murata, S. St. Laurent, D. Kohn, July 1998.(Seehttp://www.ietf.org/rfc/rfc3023.txt.)
[WSDL 2.0 Adjuncts]
Web Services Description Language (WSDL) Version 2.0 Part 2: Adjuncts , R. Chinnici, H. Haas, A. Lewis, J-J. Moreau, D. Orchard, S. Weerawarana, Editors. World Wide Web Consortium, 6 January 2006. This version of the "Web Services Description Language (WSDL) Version 2.0 Part 2: Adjuncts" Specification is available at http://www.w3.org/TR/2006/CR-wsdl20-adjuncts-20060106. The latest version of "Web Services Description Language (WSDL) Version 2.0 Part 2: Adjuncts" is available at http://www.w3.org/TR/wsdl20-adjuncts.
[Character Model for the WWW]
Character Model for the World Wide Web 1.0: Fundamentals, M. Dürst, F. Yergeau, R. Ishida, M. Wolf, T. Texin, Editors. W3C Recommendation, 15 February 2005. Latest version available at http://www.w3.org/TR/charmod/.

10.2 Informative References

[Alternative Schema Languages Support]
Discussion of Alternative Schema Languages and Type System Support in WSDL 2.0, A. Lewis, B. Parsia, Editors. World Wide Web Consortium, 17 August 2005. This version of the "Discussion of Alternative Schema Languages and Type System Support in WSDL 2.0" Working Group Note is http://www.w3.org/TR/2005/NOTE-wsdl20-altschemalangs-20050817/. The latest version of "Discussion of Alternative Schema Languages and Type System Support in WSDL 2.0" is available at http://www.w3.org/TR/wsdl20-altschemalangs.
[IETF RFC 2045]
Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies, N. Freed, N. Borenstein, Authors. Internet Engineering Task Force, November 1996. Available at http://www.ietf.org/rfc/rfc2045.txt.
[IETF RFC 2616]
Hypertext Transfer Protocol -- HTTP/1.1, R. Fielding, J. Gettys, J. Mogul, H. Frystyk, L. Masinter, P. Leach, T. Berners-Lee, Authors. Internet Engineering Task Force, June 1999. Available at http://www.ietf.org/rfc/rfc2616.txt.
[SOAP 1.2 Part 1: Messaging Framework]
SOAP Version 1.2 Part 1: Messaging Framework, M. Gudgin, M. Hadley, N. Mendelsohn, J-J. Moreau, H. Frystyk Nielsen, Editors. World Wide Web Consortium, 24 June 2003. This version of the "SOAP Version 1.2 Part 1: Messaging Framework" Recommendation is http://www.w3.org/TR/2003/REC-soap12-part1-20030624/. The latest version of "SOAP Version 1.2 Part 1: Messaging Framework" is available at http://www.w3.org/TR/soap12-part1/.
[WSA 1.0 Core]
Web Services Addressing 1.0 - Core , M. Gudgin, M. Hadley, Editors. World Wide Web Consortium, 17 August 2005. This version of Web Services Addressing 1.0 - Core is http://www.w3.org/TR/2005/CR-ws-addr-core-20050817/ The latest version of the "Web Services Addressing 1.0 - Core" document is available from http://www.w3.org/TR/ws-addr-core.
[WSDL 1.1]
Web Services Description Language (WSDL) 1.1, E. Christensen, F. Curbera, G. Meredith, and S. Weerawarana, Authors. World Wide Web Consortium, 15 March 2002. This version of the Web Services Description Language 1.1 Note is http://www.w3.org/TR/2001/NOTE-wsdl-20010315. The latest version of Web Services Description Language 1.1 is available at http://www.w3.org/TR/wsdl.
[WSDL 2.0 Primer]
Web Services Description Language (WSDL) Version 2.0 Part 0: Primer , D.Booth, C.K. Liu , Editors. World Wide Web Consortium, 6 January 2006. This version of the "Web Services Description Language (WSDL) Version 2.0 Part 0: Primer" Specification is available at http://www.w3.org/TR/2006/CR-wsdl20-primer-20060106. The latest version of "Web Services Description Language (WSDL) Version 2.0 Part 0: Primer" is available at http://www.w3.org/TR/wsdl20-primer.
[WSD Requirements]
Web Services Description Requirements, J. Schlimmer, Editor. World Wide Web Consortium, 28 October 2002. This version of the Web Services Description Requirements document is http://www.w3.org/TR/2002/WD-ws-desc-reqs-20021028. The latest version of Web Services Description Requirements is available at http://www.w3.org/TR/ws-desc-reqs.
[XPointer Framework]
XPointer Framework,Paul Grosso, Eve Maler, Jonathan Marsh, Norman Walsh, Editors. World Wide Web Consortium, 22 November 2002. This version of the XPointer Framework Proposed Recommendation is http://www.w3.org/TR/2003/REC-xptr-framework-20030325/ The latest version of XPointer Framework is available at http://www.w3.org/TR/xptr-framework/.
[XML Linking Language (XLink) 1.0]
XLinkSteve DeRose, Eve Maler, David Orchard, Editors. World Wide Web Consortium, 27 June 2001. This version of the XLink Recommendation is http://www.w3.org/TR/2001/REC-xlink-20010627/ The latest version of XLink is available at http://www.w3.org/TR/xlink/.
[XML 1.1]
Extensible Markup Language (XML) 1.1 , T. Bray, J. Paoli, C. M. Sperberg-McQueen, E. Maler, Francois Yergau, and John Cowan, Editors. World Wide Web Consortium, 04 February 2004, edited in place 15 April 2004. This version of the XML 1.1 Recommendation is http://www.w3.org/TR/2004/REC-xml-20040204. The latest version of XML 1.1 is available at http://www.w3.org/TR/xml11.
[Z Notation Reference Manual]
The Z Notation: A Reference Manual, Second Edition, J. M. Spivey, Prentice Hall, 1992.
[Fuzz 2000]
Release Notes For Fuzz 2000, J. M. Spivey.

A. The application/wsdl+xml Media Type

This appendix defines the "application/wsdl+xml" media type which can be used to describe WSDL 2.0 documents serialized as XML.

A.1 Registration

MIME media type name:

application

MIME subtype name:

wsdl+xml

Required parameters:

none

Optional parameters:
charset

This parameter has identical semantics to the charset parameter of the "application/xml" media type as specified in [RFC 3023].

Encoding considerations:

Identical to those of "application/xml" as described in [RFC 3023], section 3.2, as applied to the WSDL document Infoset.

Security considerations:

See section A.3 Security considerations.

Interoperability considerations:

There are no known interoperability issues.

Published specifications:

This document and [WSDL 2.0 Adjuncts].

Applications which use this media type:

No known applications currently use this media type.

Additional information:
File extension:

wsdl

Fragment identifiers:

Either a syntax identical to that of "application/xml" as described in [RFC 3023], section 5 or the syntax defined in A.2 Fragment Identifiers.

Base URI:

As specified in [RFC 3023], section 6.

Macintosh File Type code:

WSDL

Person and email address to contact for further information:

World Wide Web Consortium <web-human@w3.org>

Intended usage:

COMMON

Author/Change controller:

The WSDL 2.0 specification set is a work product of the World Wide Web Consortium's Web Service Description Working Group. The W3C has change control over these specifications.

A.2 Fragment Identifiers

This section defines a fragment identifier syntax for identifying components of a WSDL 2.0 document. This fragment identifier syntax is compliant with the [XPointer Framework].

A WSDL 2.0 fragment identifier consists of zero or more xmlns pointer parts followed by a WSDL 2.0 pointer part as defined below. The pointer parts have a scheme name that corresponds to one of the standard WSDL 2.0 component types, and scheme data that is a path composed of names that identify the components. The scheme names all begin with the prefix "wsdl." to avoid name conflicts with other schemes. The names in the path are of type either QName, NCName, IRI, URI, or Pointer Part depending on the context. The scheme data for extension components is defined by the corresponding extension specification.

For QNames, any prefix MUST be defined by a preceding xmlns pointer part. If a QName does not have a prefix then its namespace name is the target namespace of the WSDL 2.0 document.

The fragment identifier is typically constructed from the {name} property of the component and the {name} properties of its ancestors as a path according to Table A-1. The first column of this table gives the name of the WSDL 2.0 component. Columns labeled 1 through 4 specify the identifiers that uniquely identify the component within its context. Identifiers are typically formed from the {name} property, although in several cases references to other components are used. These identifiers are then used to construct the pointer part in the last column.


Table A-1. Rules for determining pointer parts for WSDL 2.0 components
Component 1 2 3 4 Pointer Part
Description n/a n/a n/a n/a wsdl.description()
Element Declaration element QName n/a n/a n/a wsdl.elementDeclaration(element)
Element Declaration element QName system IRI n/a n/a wsdl.elementDeclaration(element,system)
Type Definition type QName n/a n/a n/a wsdl.typeDefinition(type)
Type Definition type QName system IRI n/a n/a wsdl.typeDefinition(type,system)
Interface interface NCName n/a n/a n/a wsdl.interface(interface)
Interface Fault interface NCName fault NCName n/a n/a wsdl.interfaceFault(interface/fault)
Interface Operation interface NCName operation NCName n/a n/a wsdl.interfaceOperation(interface/operation)
Interface Message Reference interface NCName operation NCName message NCName n/a wsdl.interfaceMessageReference(interface/operation/message)
Interface Fault Reference interface NCName operation NCName message NCName fault QName wsdl.interfaceFaultReference(interface/operation/message/fault)
Binding binding NCName n/a n/a n/a wsdl.binding(binding)
Binding Fault binding NCName fault QName n/a n/a wsdl.bindingFault(binding/fault)
Binding Operation binding NCName operation QName n/a n/a wsdl.bindingOperation(binding/operation)
Binding Message Reference binding NCName operation QName message NCName n/a wsdl.bindingMessageReference(binding/operation/message)
Binding Fault Reference binding NCName operation QName message NCName fault QName wsdl.bindingFaultReference(binding/operation/message/fault)
Service service NCName n/a n/a n/a wsdl.service(service)
Endpoint service NCName endpoint NCName n/a n/a wsdl.endpoint(service/endpoint)
Feature parent Pointer Part feature IRI n/a n/a wsdl.feature(parent/feature)
Property parent Pointer Part property IRI n/a n/a wsdl.property(parent/property)
Extensions namespace URI identifier extension-specific-syntax n/a n/a wsdl.extension(namespace,identifier)

Note that the above rules are defined in terms of component properties rather than the XML Infoset representation of the component model. The following sections specify in detail how the pointer parts are constructed from the component model.

ComponentID  [ show all ]  [ hide all ]

Let ComponentID be the set of all component identifiers and component models that contain that identifier:

ComponentID
ComponentModel
id : ID
idcomponentIds
ComponentDesignator  [ show all ]  [ hide all ]

An IRI-reference consists of an IRI and a fragment identifier. IRI-references for WSDL 2.0 documents consist of an IRI that dereferences to a resource whose media type is application/wsdl+xml and a fragment identifier that conforms to XPointer syntax including the WSDL 2.0 pointer part schemes defined here. The interpretation of the WSDL 2.0 pointer parts is defined in terms of component designators which are themselves IRI-references. The component designator for a WSDL 2.0 document IRI-reference is formed by replacing the WSDL 2.0 document IRI by the target namespace IRI of the WSDL 2.0 document. The WSDL 2.0 pointer parts are interpretted in the context of the component model instance defined by the WSDL 2.0 document.

Let ComponentDesignator be the set of WSDL 2.0 component designators:

ComponentDesignator
iri : AbsoluteURI
fragId : wsdlPointerPart
ComponentContext  [ show all ]  [ hide all ]

We refer to the namespace of the WSDL 2.0 document as the context namespace. The Description, Element Declaration, and Type Definition components are not associated with any WSDL 2.0 namespace, however, for the purpose of constructing component designator IRI-references, we assign them the context namespace. In general, a WSDL 2.0 document may import other WSDL 2.0 namespaces, and the IRI of component designators for WSDL 2.0 components from the imported namespace is that namespace. Finally, the component model may contain extension components, in which case the specification for the extension must define the IRI used for extension component designators.

Let ComponentContext be the set of all component identifiers, component models that contain that identifier, and context namespaces:

ComponentContext
ComponentID
contextNamespace : AbsoluteURI
componentNamespace  [ show all ]  [ hide all ]

Let componentNamespace map a component within a given context to its component designator namespace IRI:

componentNamespace : ComponentContextAbsoluteURI

The namespace of a Description, Element Declaration, or Type Definition component is the context namespace:

ComponentContext |
      iddescriptionIds
            elementDeclIds
            typeDefIds
      componentNamespace(θComponentContext) =
            contextNamespace

The namespace of an Interface, Binding, or Service component is the namespace of its {name} property:

ComponentContext;
      c : Component |
      ccomponents
      id = Id(c)
      idinterfaceIds
            bindingIds
            serviceIds
      componentNamespace(θComponentContext) =
            (Name(c)).namespaceName

The namespace of a nested component is equal to the namespace of its parent:

ComponentContext;
      c : NestedComponent |
      ccomponents
      componentNamespace(θComponentContext) =
            componentNamespace(μid : ID |
            id = ParentId(c) θComponentContext)
ExtensionIdentifier  [ show all ]  [ hide all ]

The syntax of extension component identifiers is defined by the corresponding extension specification.

Let ExtensionIdentifier be the set of all identifiers for extension components:

[ExtensionIdentifier]
wsdlPointerPart  [ show all ]  [ hide all ]

Let wsdlPointerPart be the set of all WSDL 2.0 component pointer parts:

wsdlPointerPart ::=
      wsdlDescription |
      wsdlElementDeclarationQName×OPTIONAL[AbsoluteURI]|
      wsdlTypeDefinitionQName×OPTIONAL[AbsoluteURI]|
      wsdlInterfaceNCName|
      wsdlInterfaceFaultNCName×NCName|
      wsdlInterfaceOperationNCName×NCName|
      wsdlInterfaceMessageReferenceNCName×NCName×NCName|
      wsdlInterfaceFaultReferenceNCName×NCName×NCName×QName|
      wsdlBindingNCName|
      wsdlBindingFaultNCName×QName|
      wsdlBindingOperationNCName×QName|
      wsdlBindingMessageReferenceNCName×QName×NCName|
      wsdlBindingFaultReferenceNCName×QName×NCName×QName|
      wsdlServiceNCName|
      wsdlEndpointNCName×NCName|
      wsdlFeaturewsdlPointerPart×AbsoluteURI|
      wsdlPropertywsdlPointerPart×AbsoluteURI|
      wsdlExtensionAbsoluteURI×ExtensionIdentifier
pointerPart  [ show all ]  [ hide all ]

Let pointerPart map a component identifier within the context of some component model to its WSDL 2.0 pointer part:

pointerPart : ComponentIDwsdlPointerPart

This map will be defined for each component in the following sections.

ComponentToDesignator  [ show all ]  [ hide all ]

Let ComponentToDesignator map a WSDL 2.0 component to its component designator:

ComponentToDesignator
ComponentContext
ComponentDesignator
iri = componentNamespace(θComponentContext)
fragId = pointerPart(θComponentID)

A.2.1 The Description Component

wsdl.description()

wsdlDescription  [ show all ]  [ hide all ]

The description fragment identifier has no arguments and designates the unique Description component in the component model.

The pointer part defined by a Description component is wsdlDescription:

ComponentID |
      iddescriptionIds
      pointerPart(θComponentID) =
            wsdlDescription

A.2.2 The Element Declaration Component

wsdl.elementDeclaration(element)

wsdl.elementDeclaration(element,system)

  1. element is the {name} property of the Element Declaration component.

  2. system is the namespace absolute IRI of the extension type system used for the Element Declaration component (see 3.2 Using Other Schema Languages). This parameter is absent if XML Schema is the type system.

xmlSchemaNamespaceURI  [ show all ]  [ hide all ]

Let xmlSchemaNamespaceURI be the namespace IRI for XML Schema:

xmlSchemaNamespaceURI : AbsoluteURI
ElementDeclArgs  [ show all ]  [ hide all ]

Let ElementDeclArgs represent the arguments for the Element Declaration component pointer part:

ElementDeclArgs
element : QName
system : OPTIONAL[AbsoluteURI]
system{xmlSchemaNamespaceURI}
ElementDeclDesignator  [ show all ]  [ hide all ]

Let ElementDeclDesignator express the association between an Element Declaration component its pointer part arguments:

ElementDeclDesignator
ComponentModel
elementDeclComp : ElementDeclaration
ElementDeclArgs
elementDeclCompelementDeclComps
elementDeclComp.name = element
elementDeclComp.system{xmlSchemaNamespaceURI}system
wsdlElementDeclaration  [ show all ]  [ hide all ]

The pointer part defined by an Element Declaration component is wsdlElementDeclaration:

ElementDeclDesignator;
      id : ID |
      id = elementDeclComp.id
      pointerPart(θComponentID) =
            wsdlElementDeclaration(element, system)

A.2.3 The Type Definition Component

wsdl.typeDefinition(type)

wsdl.typeDefinition(type,system)

  1. type is the {name} property of the Type Definition component.

  2. system is the namespace absolute IRI of the extension type system used for the Type Definition component (see 3.2 Using Other Schema Languages). This parameter is absent if XML Schema is the type system.

TypeDefArgs  [ show all ]  [ hide all ]

Let TypeDefArgs represent the arguments for the Type Definition component pointer part:

TypeDefArgs
type : QName
system : OPTIONAL[AbsoluteURI]
system{xmlSchemaNamespaceURI}
TypeDefDesignator  [ show all ]  [ hide all ]

Let TypeDefDesignator express the association between a Type Definition component and its pointer part arguments:

TypeDefDesignator
ComponentModel
typeDefComp : TypeDefinition
TypeDefArgs
typeDefComptypeDefComps
typeDefComp.name = type
typeDefComp.system{xmlSchemaNamespaceURI}system
wsdlTypeDefinition  [ show all ]  [ hide all ]

The pointer part defined by a Type Definition component is wsdlTypeDefinition:

TypeDefDesignator; id : ID |
      id = typeDefComp.id
      pointerPart(θComponentID) =
            wsdlTypeDefinition(type, system)

A.2.4 The Interface Component

wsdl.interface(interface)

  1. interface is the local name of the {name} property of the Interface component.

InterfaceArgs  [ show all ]  [ hide all ]

Let InterfaceArgs represent the arguments for the Interface component pointer part:

InterfaceArgs
interface : NCName
See NCName.
InterfaceDesignator  [ show all ]  [ hide all ]

Let InterfaceDesignator express the association between an Interface component and its pointer part arguments:

InterfaceDesignator
ComponentModel
interfaceComp : Interface
InterfaceArgs
interfaceCompinterfaceComps
interfaceComp.name.localName = interface
wsdlInterface  [ show all ]  [ hide all ]

The pointer part defined by an Interface component is wsdlInterface:

InterfaceDesignator;
      id : ID |
      id = interfaceComp.id
      pointerPart(θComponentID) =
            wsdlInterface(interface)

A.2.5 The Interface Fault Component

wsdl.interfaceFault(interface/fault)

  1. interface is the local name of the {name} property of the parent Interface component.

  2. fault is the local name of the {name} property of the Interface Fault component.

InterfaceFaultArgs  [ show all ]  [ hide all ]

Let InterfaceFaultArgs represent the arguments for the Interface Fault component pointer part:

InterfaceFaultArgs
InterfaceArgs
fault : NCName
InterfaceFaultDesignator  [ show all ]  [ hide all ]

Let InterfaceFaultDesignator express the association between an Interface Fault component and its pointer part arguments:

InterfaceFaultDesignator
InterfaceDesignator
interfaceFaultComp : InterfaceFault
InterfaceFaultArgs
interfaceFaultCompinterfaceFaultComps
interfaceFaultComp.parent = interfaceComp.id
interfaceFaultComp.name.localName = fault
wsdlInterfaceFault  [ show all ]  [ hide all ]

The pointer part defined by an Interface Fault component is wsdlInterfaceFault:

InterfaceFaultDesignator;
      id : ID |
      id = interfaceFaultComp.id
      pointerPart(θComponentID) =
            wsdlInterfaceFault(interface, fault)

A.2.6 The Interface Operation Component

wsdl.interfaceOperation(interface/operation)

  1. interface is the local name of the {name} property of the parent Interface component.

  2. operation is the local name of the {name} property of the Interface Operation component.

InterfaceOpArgs  [ show all ]  [ hide all ]

Let InterfaceOpArgs represent the arguments for the Interface Operation component pointer part:

InterfaceOpArgs
InterfaceArgs
operation : NCName
InterfaceOpDesignator  [ show all ]  [ hide all ]

Let InterfaceOpDesignator express the association between an Interface Operation component and its pointer part arguments:

InterfaceOpDesignator
InterfaceDesignator
interfaceOpComp : InterfaceOperation
InterfaceOpArgs
interfaceOpCompinterfaceOpComps
interfaceOpComp.parent = interfaceComp.id
interfaceOpComp.name.localName = operation
wsdlInterfaceOperation  [ show all ]  [ hide all ]

The pointer part defined by an Interface Operation component is wsdlInterfaceOperation:

InterfaceOpDesignator;
      id : ID |
      id = interfaceOpComp.id
      pointerPart(θComponentID) =
            wsdlInterfaceOperation(interface, operation)

A.2.7 The Interface Message Reference Component

wsdl.interfaceMessageReference(interface/operation/message)

  1. interface is the local name of the {name} property of the grandparent Interface component.

  2. operation is the local name of the {name} property of the parent Interface Operation component.

  3. message is the {message label} property of the Interface Message Reference component.

InterfaceMessageRefArgs  [ show all ]  [ hide all ]

Let InterfaceMessageRefArgs represent the arguments for the Interface Message Reference pointer part:

InterfaceMessageRefArgs
InterfaceOpArgs
message : NCName
See NCName.
InterfaceMessageRefDesignator  [ show all ]  [ hide all ]

Let InterfaceMessageRefDesignator express the association between an Interface Message Reference component and its pointer part arguments:

InterfaceMessageRefDesignator
InterfaceOpDesignator
interfaceMessageRefComp : InterfaceMessageReference
InterfaceMessageRefArgs
interfaceMessageRefCompinterfaceMessageRefComps
interfaceMessageRefComp.parent = interfaceOpComp.id
interfaceMessageRefComp.messageLabel = message
wsdlInterfaceMessageReference  [ show all ]  [ hide all ]

The pointer part defined by an Interface Message Reference component is wsdlInterfaceMessageReference:

InterfaceMessageRefDesignator;
      id : ID |
      id = interfaceMessageRefComp.id
      pointerPart(θComponentID) =
            wsdlInterfaceMessageReference(interface, operation, message)

A.2.8 The Interface Fault Reference Component

wsdl.interfaceFaultReference(interface/operation/message/fault)

  1. interface is the local name of the {name} property of the grandparent Interface component.

  2. operation is the local name of the {name} property of the parent Interface Operation component.

  3. message is the {message label} property of the Interface Fault Reference component.

  4. fault is the {name} property of the Interface Fault component referred to by the {interface fault} property of the Interface Fault Reference component.

InterfaceFaultRefArgs  [ show all ]  [ hide all ]

Let InterfaceFaultRefArgs represent the arguments for the Interface Fault Reference component pointer part:

InterfaceFaultRefArgs
InterfaceOpArgs
message : NCName
fault : QName
InterfaceFaultRefDesignator  [ show all ]  [ hide all ]

Let InterfaceFaultRefDesignator express the association between an Interface Fault Reference component and its pointer part arguments:

InterfaceFaultRefDesignator
InterfaceOpDesignator
interfaceFaultComp : InterfaceFault
interfaceFaultRefComp : InterfaceFaultReference
InterfaceFaultRefArgs
interfaceFaultCompinterfaceFaultComps
interfaceFaultComp.idinterfaceComp.allInterfaceFaults
interfaceFaultComp.name = fault
interfaceFaultRefCompinterfaceFaultRefComps
interfaceFaultRefComp.interfaceFault = interfaceFaultComp.id
interfaceFaultRefComp.messageLabel = message
wsdlInterfaceFaultReference  [ show all ]  [ hide all ]

The pointer part defined by an Interface Fault Reference component is wsdlInterfaceFaultReference:

InterfaceFaultRefDesignator;
      id : ID |
      id = interfaceFaultRefComp.id
      pointerPart(θComponentID) =
            wsdlInterfaceFaultReference(interface, operation, message, fault)

A.2.9 The Binding Component

wsdl.binding(binding)

  1. binding is the local name of the {name} property of the Binding component.

BindingArgs  [ show all ]  [ hide all ]

Let BindingArgs represent the arguments for the Binding component pointer part:

BindingArgs
binding : NCName
See NCName.
BindingDesignator  [ show all ]  [ hide all ]

Let BindingDesignator express the association between a Binding component and its pointer part arguments:

BindingDesignator
ComponentModel
bindingComp : Binding
BindingArgs
bindingCompbindingComps
bindingComp.name.localName = binding

Note that the above definition applies to all Binding components, whether or not they bind a specific Interface component.

wsdlBinding  [ show all ]  [ hide all ]

The pointer part defined by a Binding component is wsdlBinding:

BindingDesignator;
      id : ID |
      id = bindingComp.id
      pointerPart(θComponentID) =
            wsdlBinding(binding)
BindingInterfaceDesignator  [ show all ]  [ hide all ]

Let BindingInterfaceDesignator express the association between an Interface component and the pointer part arguments in the case that the associated Binding component binds a specific Interface component.

BindingInterfaceDesignator
BindingDesignator
interfaceComp : Interface
interfaceCompinterfaceComps
bindingComp.interface = {interfaceComp.id}

A.2.10 The Binding Fault Component

wsdl.bindingFault(binding/fault)

  1. binding is the local name of the {name} property of the parent Binding component.

  2. fault is the {name} property of the Interface Fault component referred to by the {interface fault} property of the Binding Fault component.

BindingFaultArgs  [ show all ]  [ hide all ]

Let BindingFaultArgs represent the arguments for the Binding Fault pointer part:

BindingFaultArgs
BindingArgs
fault : QName
BindingFaultDesignator  [ show all ]  [ hide all ]

Let BindingFaultDesignator express the association between a Binding Fault component and its pointer part arguments:

BindingFaultDesignator
BindingInterfaceDesignator
interfaceFaultComp : InterfaceFault
bindingFaultComp : BindingFault
BindingFaultArgs
interfaceFaultCompinterfaceFaultComps
interfaceFaultComp.idinterfaceComp.allInterfaceFaults
interfaceFaultComp.name = fault
bindingFaultCompbindingFaultComps
bindingFaultComp.parent = bindingComp.id
bindingFaultComp.interfaceFault = interfaceFaultComp.id
wsdlBindingFault  [ show all ]  [ hide all ]

The pointer part defined by a Binding Fault component is wsdlBindingFault:

BindingFaultDesignator;
      id : ID |
      id = bindingFaultComp.id
      pointerPart(θComponentID) =
            wsdlBindingFault(binding, fault)

A.2.11 The Binding Operation Component

wsdl.bindingOperation(binding/operation)

  1. binding is the local name of the {name} property of the parent Binding component.

  2. operation is the {name} property of the Interface Operation component referred to by the {interface operation} property of the Binding Operation component.

BindingOpArgs  [ show all ]  [ hide all ]

Let BindingOpArgs represent the arguments for the Binding Operation component:

BindingOpArgs
BindingArgs
operation : QName
BindingOpDesignator  [ show all ]  [ hide all ]

Let BindingOpDesignator express the association between a Binding Operation component and its pointer part arguments:

BindingOpDesignator
BindingInterfaceDesignator
interfaceOpComp : InterfaceOperation
bindingOpComp : BindingOperation
BindingOpArgs
interfaceOpCompinterfaceOpComps
interfaceOpComp.idinterfaceComp.allInterfaceOperations
interfaceOpComp.name = operation
bindingOpCompbindingOpComps
bindingOpComp.parent = bindingComp.id
bindingOpComp.interfaceOperation = interfaceOpComp.id
wsdlBindingOperation  [ show all ]  [ hide all ]

The pointer part defined by a Binding Operation component is wsdlBindingOperation:

BindingOpDesignator; id : ID |
      id = bindingOpComp.id
      pointerPart(θComponentID) =
            wsdlBindingOperation(binding, operation)

A.2.12 The Binding Message Reference Component

wsdl.bindingMessageReference(binding/operation/message)

  1. binding is the local name of the {name} property of the grandparent Binding component.

  2. operation is the {name} property of the Interface Operation component referred to by the {interface operation} property of the parent Binding Operation component.

  3. message is the {message label} property of the Interface Message Reference component referred to by the {interface message reference} property of the Binding Message Reference component.

BindingMessageRefArgs  [ show all ]  [ hide all ]

Let BindingMessageRefArgs represent the arguments for the Binding Message Reference pointer part:

BindingMessageRefArgs
BindingOpArgs
message : NCName
BindingMessageRefDesignator  [ show all ]  [ hide all ]

Let BindingMessageRefDesignator express the association between a Binding Message Reference component and its pointer part arguments:

BindingMessageRefDesignator
BindingOpDesignator
interfaceMessageRefComp : InterfaceMessageReference
bindingMessageRefComp : BindingMessageReference
BindingMessageRefArgs
interfaceMessageRefCompinterfaceMessageRefComps
interfaceMessageRefComp.parent = interfaceOpComp.id
interfaceMessageRefComp.messageLabel = message
bindingMessageRefCompbindingMessageRefComps
bindingMessageRefComp.parent = bindingOpComp.id
bindingMessageRefComp.interfaceMessageReference = interfaceMessageRefComp.id
wsdlBindingMessageReference  [ show all ]  [ hide all ]

The pointer part defined by a Binding Message Reference component is wsdlBindingMessageReference:

BindingMessageRefDesignator;
      id : ID |
      id = bindingMessageRefComp.id
      pointerPart(θComponentID) =
            wsdlBindingMessageReference(binding, operation, message)

A.2.13 The Binding Fault Reference Component

wsdl.bindingFaultReference(binding/operation/message/fault)

  1. binding is the local name of the {name} property of the grandparent Binding component.

  2. operation is the {name} property of the Interface Operation component referred to by the {interface operation} property of the parent Binding Operation component.

  3. message is the {message label} property of the Interface Fault Reference component referred to by the {interface fault reference} property of the Binding Fault Reference component.

  4. fault is the {name} property of the Interface Fault component referred to by the {interface fault} property of the Interface Fault Reference component referred to by the {interface fault reference} property of the Binding Fault Reference component.

BindingFaultRefArgs  [ show all ]  [ hide all ]

Let BindingFaultRefArgs represent the arguments for the Binding Fault Reference pointer part:

BindingFaultRefArgs
BindingOpArgs
BindingFaultArgs
message : NCName
BindingFaultRefDesignator  [ show all ]  [ hide all ]

Let BindingFaultRefDesignator express the association between a Binding Fault Reference component and its pointer part arguments:

BindingFaultRefDesignator
BindingOpDesignator
BindingFaultDesignator
interfaceFaultRefComp : InterfaceFaultReference
bindingFaultRefComp : BindingFaultReference
BindingFaultRefArgs
interfaceFaultRefCompinterfaceFaultRefComps
interfaceFaultRefComp.parent = interfaceOpComp.id
interfaceFaultRefComp.interfaceFault = interfaceFaultComp.id
interfaceFaultRefComp.messageLabel = message
bindingFaultRefCompbindingFaultRefComps
bindingFaultRefComp.parent = bindingOpComp.id
bindingFaultRefComp.interfaceFaultReference = interfaceFaultRefComp.id
wsdlBindingFaultReference  [ show all ]  [ hide all ]

The pointer part defined by a Binding Fault Reference component is wsdlBindingFaultReference:

BindingFaultRefDesignator;
      id : ID |
      id = bindingFaultRefComp.id
      pointerPart(θComponentID) =
            wsdlBindingFaultReference(binding, operation, message, fault)

A.2.14 The Service Component

wsdl.service(service)

  1. service is the local name of the {name} property of the Service component.

ServiceArgs  [ show all ]  [ hide all ]

Let ServiceArgs represent the arguments for the Service pointer part:

ServiceArgs
service : NCName
See NCName.
ServiceDesignator  [ show all ]  [ hide all ]

Let ServiceDesignator express the association between a Service component and its pointer part arguments:

ServiceDesignator
ComponentModel
serviceComp : Service
ServiceArgs
serviceCompserviceComps
serviceComp.name.localName = service
wsdlService  [ show all ]  [ hide all ]

The pointer part defined by a Service component is wsdlService:

ServiceDesignator;
      id : ID |
      id = serviceComp.id
      pointerPart(θComponentID) =
            wsdlService(service)

A.2.15 The Endpoint Component

wsdl.endpoint(service/endpoint)

  1. service is the local name of the {name} property of the parent Service component.

  2. endpoint is the {name} property of the Endpoint component.

EndpointArgs  [ show all ]  [ hide all ]

Let EndpointArgs represent the arguments for the Endpoint pointer part:

EndpointArgs
ServiceArgs
endpoint : NCName
EndpointDesignator  [ show all ]  [ hide all ]

Let EndpointDesignator express the association between an Endpoint component and its pointer part arguments:

EndpointDesignator
ServiceDesignator
endpointComp : Endpoint
EndpointArgs
endpointCompendpointComps
endpointComp.parent = serviceComp.id
endpointComp.name = endpoint
wsdlEndpoint  [ show all ]  [ hide all ]

The pointer part defined by a Endpoint component is wsdlEndpoint:

EndpointDesignator;
      id : ID |
      id = endpointComp.id
      pointerPart(θComponentID) =
            wsdlEndpoint(service, endpoint)

A.2.16 The Feature Component

wsdl.feature(parent/feature)

  1. parent is the pointer part of the parent component.

  2. feature is the {ref} property of the Feature component.

FeatureArgs  [ show all ]  [ hide all ]

Let FeatureArgs represent the arguments for the Feature pointer part:

FeatureArgs
parent : wsdlPointerPart
feature : AbsoluteURI
FeatureDesignator  [ show all ]  [ hide all ]

Let FeatureDesignator express the association between a Feature component and its pointer part arguments:

FeatureDesignator
ComponentModel
parentComp : Component
id : ID
featureComp : Feature
FeatureArgs
id = Id(parentComp)
parentCompcomponents
pointerPart(θComponentID) = parent
featureCompfeatureComps
featureComp.parent = id
featureComp.ref = feature
wsdlFeature  [ show all ]  [ hide all ]

The pointer part defined by a Feature component is wsdlFeature:

FeatureDesignator;
      id : ID |
      id = featureComp.id
      pointerPart(θComponentID) =
            wsdlFeature(parent, feature)

A.2.17 The Property Component

wsdl.property(parent/property)

  1. parent is the pointer part of the parent component.

  2. property is the {ref} property of the Property component.

PropertyArgs  [ show all ]  [ hide all ]

Let PropertyArgs represent the arguments for the Property pointer part:

PropertyArgs
parent : wsdlPointerPart
property : AbsoluteURI
PropertyDesignator  [ show all ]  [ hide all ]

Let PropertyDesignator express the association between a Property component and its pointer part arguments:

PropertyDesignator
ComponentModel
parentComp : Component
id : ID
propertyComp : Property
PropertyArgs
id = Id(parentComp)
parentCompcomponents
pointerPart(θComponentID) = parent
propertyComppropertyComps
propertyComp.parent = id
propertyComp.ref = property
wsdlProperty  [ show all ]  [ hide all ]

The pointer part defined by a Property component is wsdlProperty:

PropertyDesignator;
      id : ID |
      id = propertyComp.id
      pointerPart(θComponentID) =
            wsdlProperty(parent, property)

A.2.18 Extension Components

WSDL 2.0 is extensible and it is possible for an extension to define new components types. The XPointer Framework scheme for extension components is:

wsdl.extension(namespace, identifier)

  1. namespace is the namespace URI that identifies the extension, e.g. for the WSDL 2.0 SOAP 1.2 Binding the namespace is http://www.w3.org/2006/01/wsdl/soap.

  2. identifier is defined by the extension using a syntax specific to the extension. The owner of the extension must define any components contributed by the extension and a syntax for identifying them.

ExtensionArgs  [ show all ]  [ hide all ]

Let ExtensionArgs represent the arguments for the extension component pointer part:

ExtensionArgs
namespace : AbsoluteURI
identifier : ExtensionIdentifier
ExtensionDesignator  [ show all ]  [ hide all ]

Let ExtensionDesignator express the association between an extension component its pointer part arguments:

ExtensionDesignator
ComponentModel
extensionComp : Component
ExtensionArgs
extensionCompcomponents

The details of the association are defined by each extension specification.

wsdlExtension  [ show all ]  [ hide all ]

The namespace IRI of an extension component is defined by the extension specification.

The pointer part defined by an extension component is wsdlExtension:

ExtensionDesignator;
      id : ID |
      id = Id(extensionComp)
      pointerPart(θComponentID) =
            wsdlExtension(namespace, identifier)

A.3 Security considerations

This media type uses the "+xml" convention, it shares the same security considerations as described in [RFC 3023], section 10.

B. Acknowledgements (Non-Normative)

This document is the work of the W3C Web Service Description Working Group.

Members of the Working Group are (at the time of writing, and by alphabetical order): Charlton Barreto (Adobe Systems Inc.), Allen Brookes (Rogue Wave Softwave), Dave Chappell (Sonic Software), Helen Chen (Agfa-Gevaert N. V.), Roberto Chinnici (Sun Microsystems), Kendall Clark (University of Maryland), Glen Daniels (Sonic Software), Paul Downey (British Telecommunications), Youenn Fablet (Canon), Hugo Haas (W3C), Tom Jordahl (Macromedia), Anish Karmarkar (Oracle Corporation), Jacek Kopecky (DERI Innsbruck at the Leopold-Franzens-Universität Innsbruck, Austria), Amelia Lewis (TIBCO Software, Inc.), Michael Liddy (Education.au Ltd.), Kevin Canyang Liu (SAP AG), Jonathan Marsh (Microsoft Corporation), Josephine Micallef (SAIC - Telcordia Technologies), Jeff Mischkinsky (Oracle Corporation), Dale Moberg (Cyclone Commerce), Jean-Jacques Moreau (Canon), Mark Nottingham (BEA Systems, Inc.), David Orchard (BEA Systems, Inc.), Vivek Pandey (Sun Microsystems), Bijan Parsia (University of Maryland), Gilbert Pilz (BEA Systems, Inc.), Tony Rogers (Computer Associates), Arthur Ryman (IBM), Adi Sakala (IONA Technologies), Asir Vedamuthu (Microsoft Corporation), Sanjiva Weerawarana (WSO2), Ümit Yalçınalp (SAP AG).

Previous members were: Lily Liu (webMethods, Inc.), Don Wright (Lexmark), Joyce Yang (Oracle Corporation), Daniel Schutzer (Citigroup), Dave Solo (Citigroup), Stefano Pogliani (Sun Microsystems), William Stumbo (Xerox), Stephen White (SeeBeyond), Barbara Zengler (DaimlerChrysler Research and Technology), Tim Finin (University of Maryland), Laurent De Teneuille (L'Echangeur), Johan Pauhlsson (L'Echangeur), Mark Jones (AT&T), Steve Lind (AT&T), Sandra Swearingen (U.S. Department of Defense, U.S. Air Force), Philippe Le Hégaret (W3C), Jim Hendler (University of Maryland), Dietmar Gaertner (Software AG), Michael Champion (Software AG), Don Mullen (TIBCO Software, Inc.), Steve Graham (Global Grid Forum), Steve Tuecke (Global Grid Forum), Michael Mahan (Nokia), Bryan Thompson (Hicks & Associates), Ingo Melzer (DaimlerChrysler Research and Technology), Sandeep Kumar (Cisco Systems), Alan Davies (SeeBeyond), Jacek Kopecky (Systinet), Mike Ballantyne (Electronic Data Systems), Mike Davoren (W. W. Grainger), Dan Kulp (IONA Technologies), Mike McHugh (W. W. Grainger), Michael Mealling (Verisign), Waqar Sadiq (Electronic Data Systems), Yaron Goland (BEA Systems, Inc.), Ümit Yalçınalp (Oracle Corporation), Peter Madziak (Agfa-Gevaert N. V.), Jeffrey Schlimmer (Microsoft Corporation), Hao He (The Thomson Corporation), Erik Ackerman (Lexmark), Jerry Thrasher (Lexmark), Prasad Yendluri (webMethods, Inc.), William Vambenepe (Hewlett-Packard Company), David Booth (W3C), Sanjiva Weerawarana (IBM), Charlton Barreto (webMethods, Inc.), Asir Vedamuthu (webMethods, Inc.), Igor Sedukhin (Computer Associates), Martin Gudgin (Microsoft Corporation), Rebecca Bergersen (IONA Technologies), Ugo Corda (SeeBeyond).

The people who have contributed to discussions on www-ws-desc@w3.org are also gratefully acknowledged.

C. IRI-References for WSDL 2.0 Components (Non-Normative)

This appendix provides a syntax for IRI-references for all components found in a WSDL 2.0 document. The IRI-references are easy to understand and compare, while imposing no burden on the WSDL 2.0 author.

C.1 WSDL 2.0 IRIs

There are two main cases for WSDL 2.0 IRIs:

  • the IRI of a WSDL 2.0 document

  • the IRI of a WSDL 2.0 namespace

The IRI of a WSDL 2.0 document can be dereferenced to give a resource representation that contributes component definitions to a single WSDL 2.0 namespace. If the media type is set to the WSDL 2.0 media type, then the fragment identifiers can be used to identify the main components that are defined in the document.

However, in keeping with the recommendation in 2.1.1 The Description Component that the namespace URI be dereferencible to a WSDL 2.0 document, this appendix specifies the use of the namespace IRI with the WSDL 2.0 fragment identifiers to form an IRI-reference.

The IRI in an IRI-reference for a WSDL 2.0 component is the namespace name of the {name} property of either the component itself, in the case of Interface, Binding, and Service components, or the {name} property of the ancestor top-level component. The IRI provided by the namespace name of the {name} property is combined with a fragment identifier as defined in A.2 Fragment Identifiers.

C.2 Example

Consider the following WSDL 2.0 document located at http://example.org/TicketAgent.wsdl:

Example C-1. IRI-References - Example WSDL 2.0 Document


<?xml version="1.0" encoding="UTF-8"?>
<wsdl:description 
    targetNamespace="http://example.org/TicketAgent.wsdl20" 
    xmlns:xsTicketAgent="http://example.org/TicketAgent.xsd" 
    xmlns:wsdl="http://www.w3.org/2006/01/wsdl" 
    xmlns:xs="http://www.w3.org/2001/XMLSchema" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://www.w3.org/2006/01/wsdl http://www.w3.org/2006/01/wsdl/wsdl20.xsd">
        
    <wsdl:types>
        <xs:import schemaLocation="TicketAgent.xsd" 
                   namespace="http://example.org/TicketAgent.xsd" />
    </wsdl:types>
        
    <wsdl:interface name="TicketAgent">
        <feature ref="http://example.com/secure-channel"
                 required="true"/>

        <wsdl:operation name="listFlights"
                        pattern="http://www.w3.org/2006/01/wsdl/in-out">
            <wsdl:input element="xsTicketAgent:listFlightsRequest"/>
            <wsdl:output element="xsTicketAgent:listFlightsResponse"/>
        </wsdl:operation>
                
        <wsdl:operation name="reserveFlight"
                        pattern="http://www.w3.org/2006/01/wsdl/in-out">
            <wsdl:input element="xsTicketAgent:reserveFlightRequest"/>
            <wsdl:output element="xsTicketAgent:reserveFlightResponse"/>
        </wsdl:operation>
    </wsdl:interface>
</wsdl:description>

Its components have the following IRI-references:

Example C-2. IRI-References - Example IRIs

http://example.org/TicketAgent.wsdl20#
  wsdl.description() 

http://example.org/TicketAgent.wsdl20#
  xmlns(xsTicketAgent=http://example.org/TicketAgent.xsd)
  wsdl.elementDeclaration(xsTicketAgent:listFlightsRequest) 

http://example.org/TicketAgent.wsdl20#
  xmlns(xsTicketAgent=http://example.org/TicketAgent.xsd)
  wsdl.elementDeclaration(xsTicketAgent:listFlightsResponse) 

http://example.org/TicketAgent.wsdl20#
  xmlns(xsTicketAgent=http://example.org/TicketAgent.xsd)
  wsdl.elementDeclaration(xsTicketAgent:reserveFlightRequest) 

http://example.org/TicketAgent.wsdl20#
  xmlns(xsTicketAgent=http://example.org/TicketAgent.xsd)
  wsdl.elementDeclaration(xsTicketAgent:reserveFlightResponse) 

http://example.org/TicketAgent.wsdl20#
  wsdl.interface(TicketAgent) 

http://example.org/TicketAgent.wsdl20#
  wsdl.feature(
  wsdl.interface(TicketAgent)/http://example.com/secure-channel) 

http://example.org/TicketAgent.wsdl20#
  wsdl.interfaceOperation(TicketAgent/listFlights) 

http://example.org/TicketAgent.wsdl20#
  wsdl.interfaceMessageReference(TicketAgent/listFlights/In) 

http://example.org/TicketAgent.wsdl20#
  wsdl.interfaceMessageReference(TicketAgent/listFlights/Out) 

http://example.org/TicketAgent.wsdl20#
  wsdl.interfaceOperation(TicketAgent/reserveFlight)

http://example.org/TicketAgent.wsdl20#
  wsdl.interfaceMessageReference(TicketAgent/reserveFlight/In) 

http://example.org/TicketAgent.wsdl20#
  wsdl.interfaceMessageReference(TicketAgent/reserveFlight/Out) 

D. Component Summary (Non-Normative)

Table D-1 lists all the components in the WSDL 2.0 abstract Component Model, and all their properties.


Table D-1. Summary of WSDL 2.0 Components and their Properties
Component Defined Properties
- {features}, {name}, {parent}, {properties}
Binding {binding faults}, {binding operations}, {features}, {interface}, {name}, {properties}, {type}
Binding Fault {interface fault}, {features}, {parent}, {properties}
Binding Fault Reference {features}, {interface fault reference}, {parent}, {properties}
Binding Message Reference {features}, {interface message reference}, {parent}, {properties}
Binding Operation {binding fault references}, {binding message references}, {interface operation}, {features}, {parent}, {properties}
Description {bindings}, {element declarations}, {interfaces}, {services}, {type definitions}
Element Declaration {name}, {system}
Endpoint {address}, {binding}, {features}, {name}, {parent}, {properties}
Feature {parent}, {ref}, {required}
Interface {extended interfaces}, {features}, {interface faults}, {interface operations}, {name}, {properties}
Interface Fault {element declaration}, {features}, {name}, {parent}, {properties}
Interface Fault Reference {direction}, {features}, {interface fault}, {message label}, {parent}, {properties}
Interface Message Reference {direction}, {element declaration}, {features}, {message content model}, {message label}, {parent}, {properties}
Interface Operation {features}, {interface fault references}, {interface message references}, {message exchange pattern}, {name}, {parent}, {properties}, {style}
Property {parent}, {ref}, {value}, {value constraint}
Service {endpoints}, {features}, {interface}, {name}, {properties}
Type Definition {name}, {system}
Property Where Defined
address Endpoint.{address}
binding Endpoint.{binding}
binding faults Binding.{binding faults}
binding operations Binding.{binding operations}
bindings Description.{bindings}
direction Interface Fault Reference.{direction}, Interface Message Reference.{direction}
element declaration Interface Fault.{element declaration}, Interface Message Reference.{element declaration}
element declarations Description.{element declarations}
endpoints Service.{endpoints}
extended interfaces Interface.{extended interfaces}
features .{features}, Binding.{features}, Binding Fault.{features}, Binding Fault Reference.{features}, Binding Message Reference.{features}, Binding Operation.{features}, Endpoint.{features}, Interface.{features}, Interface Fault.{features}, Interface Fault Reference.{features}, Interface Message Reference.{features}, Interface Operation.{features}, Service.{features}
interface Binding.{interface}, Service.{interface}
interface fault Binding Fault.{interface fault}, Interface Fault Reference.{interface fault}
interface fault references Interface Operation.{interface fault references}
interface faults Interface.{interface faults}
interface message references Interface Operation.{interface message references}
interface operations Interface.{interface operations}
interfaces Description.{interfaces}
message content model Interface Message Reference.{message content model}
message exchange pattern Interface Operation.{message exchange pattern}
message label Interface Fault Reference.{message label}, Interface Message Reference.{message label}
name .{name}, Binding.{name}, Element Declaration.{name}, Endpoint.{name}, Interface.{name}, Interface Fault.{name}, Interface Operation.{name}, Service.{name}, Type Definition.{name}
parent .{parent}, Binding Fault.{parent}, Binding Fault Reference.{parent}, Binding Message Reference.{parent}, Binding Operation.{parent}, Endpoint.{parent}, Feature.{parent}, Interface Fault.{parent}, Interface Fault Reference.{parent}, Interface Message Reference.{parent}, Interface Operation.{parent}, Property.{parent}
properties .{properties}, Binding.{properties}, Binding Fault.{properties}, Binding Fault Reference.{properties}, Binding Message Reference.{properties}, Binding Operation.{properties}, Endpoint.{properties}, Interface.{properties}, Interface Fault.{properties}, Interface Fault Reference.{properties}, Interface Message Reference.{properties}, Interface Operation.{properties}, Service.{properties}
ref Feature.{ref}, Property.{ref}
required Feature.{required}
services Description.{services}
style Interface Operation.{style}
system Element Declaration.{system}, Type Definition.{system}
type Binding.{type}
type definitions Description.{type definitions}
value Property.{value}
value constraint Property.{value constraint}

E. Part 1 Change Log (Non-Normative)

E.1 WSDL 2.0 Specification Changes


Table E-1. Summary of WSDL 2.0 Specification Changes
Date Author Description
20051121 AGR Added assertions posted to mailing list: "types, description, interface, feature, and property assertions", Lawrence Mandel, 2005-11-17.
20051118 AGR Added assertions posted to mailing list: "types assertions", Lawrence Mandel, 2005-11-15.
20051118 AGR Simiplified Z Notation for fragment identifiers and updated Example IRIs.
20051117 AGR LC344 : Reviewed use of "Note that" throughout and removed usages where they would be incorrectly interpreted as non-normative. Implemented resolutions of #1, #2, #6, #10, and #14.
20051117 AGR Fixed typos posted to mailing list: WSDL 2.0 spec typos, Lawrence Mandel, 2005-11-16.
20051117 JJM LC358 : fixed formatting in example C.2.
20051117 JJM LC356 : fixed contradiction between sections 2.1.2 and 2.2.1.
20051117 JJM LC302 : point to RFC3987 instead of the draft TAG finding.
20051117 JJM LC355 : fixed section 2.10.3, table had error, "interface fault component".
20051116 AGR Added Z Notation for fragment identifiers and component designators for Description, Feature, Property, and Extension components in Appendix A - Fragment Identifiers.
20051115 AGR Added Z Notation for fragment identifiers and component designators for Element Declaration and Type Definition components in Appendix A - Fragment Identifiers.
20051113 AGR Added Z Notation for fragment identifiers and component designators for Interface, Binding, and Service component families in Appendix A - Fragment Identifiers.
20051112 AGR Corrected order of arguments in fragment identifier for Binding Fault Reference to match that in Interface Fault Reference.
20051112 AGR LC361 : Defined what should be declared as a fault.
20051112 AGR LC344#5 : Allow an operation style to constrain faults as per the resolution at the Yokohama F2F.
20051112 AGR LC350 : Corrected Introduction.
20051112 AGR LC336 : Soften statement about use of xs:anyURI and refer to WS-Addressing Endpoint Reference.
20051112 AGR LC305 : Aligned BNF notational conventions with WS-Addressing, Pseudo schemas do not include extensibility points for brevity.
20051110 AGR LC353 : Added definition of a valid WSDL 2.0 component model.
20051110 JJM LC360 : What should be declared as a fault, as per Tokyo f2f.
20051110 JJM LC357 : Added anyURI-IRI warning, as per Tokyo f2f.
20051110 JJM LC344#5 : Incorporated text regarding mutually exclusive operation styles, as per Tokyo f2f.
20051103 AGR LC344#12 : Completed editorial improvements to message label rules. Moved long definitions out of tables.
20051101 AGR Added Z Notation for message exchange pattern, placeholder message, and fault propagation ruleset in 2.4.1.1 Message Exchange Pattern . Replaced the term fault pattern with fault propagation ruleset throughout for consistency and agreement with Part 2.
20051027 AGR Added bidirectional linking between assertions and the summary table, and added a section on notation, 1.4.10 Assertions.
20051027 AGR Updated 3.1 Using W3C XML Schema Description Language as per proposal How to Treat Built-In Schema Types.
20051027 AGR LC344#12 : Editorial improvements to message label rules. Added precise definitions of message exchange pattern, placeholder message, and fault propagation ruleset in 2.4.1.1 Message Exchange Pattern.
20051020 AGR LC344#6 : Editorial improvements to 2.7.1 The Feature Component.
20051016 AGR LC328 : Added introductory paragraph to 8. Conformance in response to comment #2.
20050924 AGR Added initial markup for assertions.
20050914 AGR LC311: Clarified that the URI associated with alternative schema languages for defining other type systems is the namespace used for its extension elements and attributes and that it is an absolute IRI.
20050914 AGR LC309: Replaced the list of operation style definitions with a general reference to Part 2.
20050914 AGR LC308: Added references to Fragment Identifier appendix to show how Interface Fault and Interface Operation can be uniquely identified.
20050901 RRC LC310: Removed uses of undefined "ws:" prefix and made use of prefixes in section 4.2 more regular.
20050730 AGR Removed obsolete editorial notes.
20050727 AGR LC96 : Added clarification to section 4.2 stating that imported WSDL components are pervasive like in XML Schema as per resolution agreed to at F2F.
20050727 AGR LC91 : Added clarification to section 3.1.1 stating that some differences to xs:import apply as per resolution agreed to at F2F.
20050727 AGR Corrected typo in section 3.1.2 on inlining two or more schemas that have the same namespace.
20050719 AGR Added xs:import and xs:schema to XML Syntax Summary for types.
20050711 AGR Updated Example C-2. IRI-References - Example IRIs to match Appendix A.
20050616 AGR Corrected Feature and Property composition rules for Interface, Service, and Endpoint.
20050615 AGR LC117: Removed Service References and Endpoint References and added wsdlx:interface and wsdlx:binding.
20050613 RRC LC74c: changed wsdl:documentation element cardinality to zero or more and adding sentence on use of xml:lang .
20050613 RRC LC74a: changed URIs to IRIs except in Feature and Property Components.
20050613 AGR LC75v: Removed any text that discussed conformance for WSDL 2.0 processors.
20050613 JJM LC131: added pseudo-schema comment.
20050613 JJM LC70: reiterated behavior is undefined when several schema languages used simultaneously.
20050613 JJM LC70: moved appendix D (other schema languages) to a separate specification.
20050612 AGR Finshed first pass at adding markup for WSDL component and property definitions and references.
20050610 AGR Added table of components and their properties, courtesy of JM.
20050608 AGR Added markup for WSDL component and property definitions and references.
20050602 HH LC75c: moved safety to Part 2.
20050601 JJM LC75x: removed appendix "migrating from WSDL 1.1 to WSDL 2.0".
20050531 JJM LC82: removed ONMR section (transfer to primer).
20050531 JJM LC71: added default value for pattern attribute (".../inout").
20050526 AGR LC64: Added fragment identifiers for Description, Element Declaration, and Type Definition components.
20050525 AGR Added final ComponentModel to Z Notation.
20050523 AGR Reordered some paragraphs to improve consistency.
20050522 AGR Added consistency and key constraints to the Z notation.
20050520 JJM LC129: wsdlLocation can now also point to WSDL 1.1 documents.
20050520 JJM LC126: Added default value for wsdl:required (false).
20050520 JJM Fixed typo in 2.14.1.1.
20050519 JJM LC97: Uniformized setting default values. Fixed typos along the way.
20050518 AGR Added parent and integrity constraints to the Z notation.
20050513 JJM LC18: Fixed the SOAP 1.2/WSDL 2.0 feature text. Wordsmithed the introduction.
20050513 JJM LC127: Fixed wsld:include description, which is not about merging.
20050512 JJM LC75o: Remove "if any" from Service/{endpoints}, since there is always one.
20050511 AGR LC121: Distinguished between wsdl:import and xs:import, and wsdl:include and xs:include in Description component mapping table.
20050504 JJM Rewrote the "Operation Name Mapping Requirement" section to make it best practice.
20050504 JJM Removed empty subsections in "XML Schema 1.0 Simple..."
20050504 JJM Rewrote the "Single Interface" section, as per editorial AI dated 2005-01-19.
20050503 JJM Rewrote the ONMR as Best practice.
20050503 JJM LC112: Implemented resolution for issue LC112.
20050503 JJM Completed editorial action LC78.
20050501 AGR LC120: Clarified description of include and import, removed contradictions, and added references to QName resolution.
20050501 AGR LC116: Clarified that schemaLocation is not required if the namespace has been resolved in the component model. Replaced the term "embedded schema" with "inlined schema" throughout.
20050501 AGR LC89m: Made all top-level components behave the same under include and import.
20050501 AGR LC89f: Added statement on XML document conformance.
20050501 AGR LC74: Refer to WSDL 2.0 explicitly throughout. In particular, only imports and includes of WSDL 2.0 documents are allowed.
20050501 AGR LC99: Added #other to {message content model} property of Interface Message Reference component, and to WSDL schema.
20050501 AGR LC125: Renamed components Fault Reference -> Interface Fault Reference, Message Reference -> Interface Message Reference, and the corresponding properties.
20050430 AGR LC117: Added use of EndpointType for endpoint references.
20050429 AV LC96 and LC120: Modified section 4.2 to align wsdl:import with xs:import.
20050429 RRC LC75w: Removed "is not dereferenceable or" from section 4.1.1 and removed references to a WSDL processor.
20050429 RRC Added clarification that an operation style MAY affect only input or only output messages (or any other combination).
20050421 AGR LC81 : Added constraints to ensure the component model can be serialized as a WSDL 2.0 XML Infoset. In the Interface component, the declared Interface Faults and Operations MUST have the same namespace as the Interface.
20050418 RRC LC115: Moved document conformance section after 1.1.
20050418 RRC LC89g: Replaced incorrect references to the [owner] Infoset property with the correct [owner element].
20050417 AGR LC107 : Use a consistent naming convention for properties that refer to components. Make the property name match the component name as follows:
  • Interface.{faults} -> {interface faults}

  • Interface.{operations} -> {interface operations}

  • InterfaceFault.{element} -> {element declaration}

  • MessageReference.{element} -> {element declaration}

  • FaultReference.{fault reference} -> {interface fault}

  • Binding.{faults} -> {binding faults}

  • Binding.{operations} -> {binding operations}

  • BindingFault.{fault reference} -> {interface fault}

  • BindingOperation.{operation reference} -> {interface operation}

  • BindingOperation.{message references} -> {binding message references}

  • BindingOperation.{fault references} ->{binding fault references}

20050417 AGR LC34b : Added the constraint that the {uri} property of a Feature or Property component within a {features} or {properties} property MUST be unique.
20050416 AGR LC105 : Added {parent} property to nested components.
20050416 AGR Moved the fragment identifier definition into the media registration appendix.
20050414 JJM Fixed XML Schema P1/P2 version listed in the bibliography section.
20050413 AGR LC87 : Improved clarity of the decription of Component Designators in Appendix C.
20050407 JJM Reworded the introduction for wsdlLocation, as per LC26 resolution.
20050407 JJM Moved paragraphs 6-9 of section 2.1.1 into 2.1.2.
20050331 AGR LC113 : In the Feature and Property Composition sections, the in-scope components for Binding Operation, Binding Fault, Binding Message Reference, and Binding Fault Reference should include those of the corresponding Interface Operation, Interface Fault, Message Reference, and Fault Reference, respectively. Also updated specification references use Part 2: Adjuncts, and corrected validation errors.
20050320 AGR LC104: The operations, faults, features, and properties of an Interface component are those defined directly on the component and do not include those from the extended interfaces.
20050320 AGR Rename Z Notation versions as wsdl20-z.html and wsdl20-z-ie-html.
20050315 AGR Hide Z Notation in the Normative version of the spec.
20050314 AGR Removed section on RPC Style so it can be included in Adjuncts.
20050310 AGR Fixed minor Binding Operation errors introduced by addition of Binding Message Reference.
20050310 JJM Replaced schema visibility table with Asir's revised version.
20050309 AGR Fixed minor Z typechecking errors introduced by addition of Binding Message Reference. Kudos to RRC for updating the Z Notation!
20050301 RRC LC55: added Binding Fault Reference component and updated the definition of the Binding Message Reference component to be in sync with it, per issue resolution.
20050301 RRC LC51: added Fault Reference component to the feature composition section; added mapping of {type definitions} property of the Description component from the XML representation.
20050301 RRC LC48a, LC49: implemented resolutions.
20050228 JJM X and Y: Added note clarifying extensibility semantics.
20050228 JJM X: Added note clarifying extensibility semantics.
20050228 JJM X: Added text on the meaning of a service description.
20050218 RRC Replaced "provider agent" with "Web service" and "requester agent" with "client" (resolution of LC30).
20050218 RRC Moved section on the operation name mapping requirement to section 2.13 (resolution of LC8).
20050218 RRC Implemented resolution of LC5h.
20050220 AGR Refactored Feature and Property Z Notation in preparation for formalization of composition model.
20050220 AGR LC27: Partial Resolution from 2005-01-19: value sets intersect. Resolve Property Composition Edge Cases by requiring the conjunction of all constraints to apply. The composed value of a Property is intersection of the value set of each in-scope Property.
20050220 AGR LC20: Partial Resolution from 2005-01-19: "true" trumps. Resolve Feature Composition Edge Cases by requiring the conjunction of all constraints to apply. The composed value of a Feature is "true" if and only if at least one in-scope value of the Feature is "true".
20050220 AGR LC75i: At least one of the [children] of an Operation MUST be an "input" or "output". Agree to remove "infault" and "outfault" from the list since it does not make sense to have an Operation with only faults.
20050220 AGR Completed Action Item - 2005-02-10: DBooth to mail Arthur change to wording on media type registration, Arthur to incorporate.
20050217 JJM LC75s: Add table indicating the visibility of schema components.
20050217 JJM LC52a: Indicate included components also belong to the same target namespace, as per Jacek original suggestion.
20050216 JJM LC60: Indicate it is OK to embed 2 schemas from the same targetNS.
20050216 JJM LC75t: Remove the restriction that wsdl:include cannot be transitive.
20050216 JJM LC91: Fixed wording regarding importing schema and effect on WSDL components.
20050211 AGR email: Added an informative reference to WS-Addressing and referred to it from the Operation Name Mapping Requirement.
20050210 AGR email: Corrected WSDL Media Type Registration as per David Booth's email.
20050209 AGR Editorial: Combine {name} NCName and {target namespace} URI properties into a single {name} QName property.
20050121 AGR LC75l LC103: Make {message label} property of Binding Message Reference component REQUIRED and fix up XML mapping table. />.
20050121 AGR LC75 LC89b LC89c: Drop support for XML 1.1, drop wsdls types, and use XSD 1.0 types. />.
20050120 AGR LC73 LC75n: Added "single_interface_per_service".
20050119 AGR Editorial improvements to Z Notation. Added referential integrity constraints.
20050118 AGR Edited Notational Conventions and References sections. Added character entity references for accented characters.
20050117 AGR Edited table markup to simplify PDF generation.
20041231 AGR Added reference to non-normative IE version of the specification.
20041227 AGR Added reference to non-normative DHTML version of the specification.
20041218 AGR LC34a: Refer to "Appendix C - URI References for WSDL Components" whenever a component cannot be referred to by QName .
20041126 AGR LC43: Rename <definitions> to <description>.
20041102 HH LC38: Using real URI for DTD import
20041024 AGR Added initial Z Notation for component model.
20040930 AGR LC6d: Revised Appendix C, URI References.
20040929 AGR LC34b, LC34c, LC34d: Revised Appendix C, URI References.
20040802 RRC Removed paragraph added per resolution of issue 211 (undone per action item 5 of the 2004-07-29 concall).
20040802 RRC Added clarification on the meaning of required language extensions.
20040802 RRC Added operation name requirement to the Interface component section.
20040802 RRC Added introductory text for the Property Component (per action item 2 of the 2004-07-29 concall).
20040727 RRC Made the Property component independent of XML Schema (issue 248).
20040727 SW Issue 243 text
20040727 SW Incorporated Paul's words for issue 235
20040727 SW Added MarkN's text for issue 211
20040727 SW Added note to processor conf rules for optional extensions and features about what optional means.
20040727 SW Removed contentious area ed note thing per decision to do those via minority opinions.
20040722 HH Defined wsdls:int for http:code.
20040721 RRC Made almost all set-valued properties optional and added a rule to default them to the empty set, per agenda item 7 of 2004-07-15 concall.
20040715 RRC Marked the {message label} property of the Message Reference and Fault Reference components as required.
20040715 RRC Made the {style} property into a set of xs:anyURI.
20040714 RRC Added definition of simple types used by the component model (issue 177).
20040713 RRC Added clarification to interface extensions per issue 220.
20040713 RRC Added clarification to Binding Operation section (issue 227).
20040713 RRC Fixed references to Interface Fault components in the Fault Reference component section.
20040713 RRC Added description of pseudo-schema syntax.
20040714 SW Made f&p allowed in the remaining places and updated composition rules
20040713 SW Added negative conformance criteria: not required to process XML1.1 etc.
20040713 SW Corrected reference to frag ID syntax to for issue 209
20040713 SW Implemented Jonathan's proposal for issue 160.
20040713 SW Put ednote in contentious areas asking for extra feedback.
20040712 RRC Marked all component model properties as REQUIRED or OPTIONAL (issue 213).
20040712 RRC Added definition for equivalence of list-typed values.
20040712 RRC Clarified RPC style rules for one-way operations (issue 215).
20040708 JJM Finished adding clarifications for non-XML type system extensibility.
20040708 JJM Include the definition of "actual value" from XML Schema (Issue 219).
20040708 JJM Added resolution to issue 218 (2004Jun/0276.html, including Mark's amendment).
20040708 JJM Component equivalence (2004Jun/0195.html, 2004Jun/0199.html and ref to the charmod [Issue 210]).
20040706 RRC Added clarifications for non-XML type system extensibility.
20040706 RRC Expanded component model definition.
20040706 RRC Added clarification to section 2.1.1 per resolution of issue 222.
20040706 RRC Made it possible to use rpc style with schema languages other than XML Schema.
20040702 SW Made operation/@style be a list of URIs.
20040702 SW Had forgotten to map to the {type} property of binding.
20040625 SW Allowed F&P *nearly* everywhere. Sigh.
20040618 SW Changed F&P composition model to nearest enclosing scope.
20040618 SW Incorporated Jacek's purpose of bindings text as appropriate.
20040526 SW Added @address to /definitions/service/endpoint per F2F decision
20040526 SW Added @type to /definitions/binding per F2F decision
20040519 SW Renamed wsoap12: to wsoap:.
20040323 JJM Commented out the (missing) property example.
20040322 RRC Added definition of wsdli:wsdlLocation attribute.
20040322 JJM Added faults to properties and features.
20040319 JJM Use lowercase "should" in notes.
20040319 JJM Comment out features at service level. Uniformize scope between features and properties.
20040318 JJM Moved normative notes into the main body of the document.
20040318 JJM Incorporated the property text from Glen.
20040318 JJM Addressed comments from Yuxiao Zhao.
20040318 JJM Updated the feature description, as per Glen and David Booth's suggestions.
20040317 RRC Removed redundant {styleDefault} property of the interface component.
20040317 JJM Include comments from Kevin.
20040315 RRC Added clarification on embedded XML schemas that refer to siblings.
20040315 RRC Updated RPC signature extension to use #in/#out/#inout/#return tokens.
20040315 RRC Added explanatory text to types and modularization sections per resolution of issue #102.
20040315 SW Change binding/{fault,operation}/@name to @ref
20040312 RRC Fixed appendix D to take the removal of wsdl:message into account.
20040312 RRC Added definition of wrpc:signature extension attribute.
20040311 SW Change fault stuff per decision to make faults first class in interfaces.
20040308 SW Renamed {message} property to {element} and @message to @element
20040305 SW Added {safety} property
20040227 MJG Merged in branch Issue143 containing resolution of issue 143
20040227 SW Dropped {type definitions} property from definitions; leftover from <message> days.
20040226 SW Working thru various edtodo items.
20040106 JS Per 18 Dec 2003 telecon decision, added text re: circular includes.
20031204 JS Per 4 Dec 2003 telecon decision, removed redundant binding/operation/{infault, outfault}/@messageReference.
20031105 JS Added point to attributes task force recommendation accepted by the working group.
20031104 JS Mapping to component model for {message} of Fault Reference component indicated that message attribute information item was optional, but the pseudo syntax and XML representation indicated it was required. Made uniformly optional to allow other type systems as was previously done for {message} of Message Reference component.
20031104 JS Renamed interface /operation /{input,output} /@body to ./@message and interface /operation /{infault,outfault} /@details to ./@message per 4 Nov face-to-face decision.
20031104 JS Made interface /operation /{input,output,infault,outfault} /@messageReference optional per 4 Nov face-to-face decision.
20031104 JS Removed interface/operation/{input,output}/@header per 4 Nov face-to-face decision.
20031102 SW Updated fault reference components to indicate that if operation's MEP uses MTF then the fault is in the opposite direction as the referenced message and if it use FRM then its in the same direction. Per 10/30 telecon decision.
20031102 SW Updated operation styles terminology per message #57 of Oct. and the RPC style rules per message #58 of Oct. per decision on 10/30 telecon to consider those status quo.
20031102 SW Clarified wording in operation styles discussion to better explain the use of the {style} attribute.
20031102 SW Clarified wording in XML <-> component model mapping section for message reference components to say that {body} and {headers} may not have a value.
20031102 SW Made interface/operation/(input|output)/@messageReference REQUIRED per 10/30 telecon decision.
20031028 SW Renamed to wsdl20.xml and updated contents.
20031028