W3C

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

W3C Working Draft 10 May 2005

This version:
http://www.w3.org/TR/2005/WD-wsdl20-20050510
Latest version:
http://www.w3.org/TR/wsdl20
Previous versions:
http://www.w3.org/TR/2004/WD-wsdl20-20040803
Editors:
Roberto Chinnici, Sun Microsystems
Jean-Jacques Moreau, Canon
Arthur Ryman, IBM
Sanjiva Weerawarana

This document is also available in these non-normative formats: XHTML with Z-notation, postscript, PDF, 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 criteria for a conformant processor of 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 a W3C Working Draft of the Web Services Description Language (WSDL) 2.0 document. This document has been produced as part of the W3C Web Services Activity. The authors of this document are the Web Services Description Working Group members.

The Working Group is in the process of addressing the comments it has received on WSDL 2.0 Part 1, 2 and 3 during its Last Call period. This document reflects the current state of this work. The latest status of the last call issues received by the Working Group can be found in the last call issues list. The Working Group is planning to publish a new Last Call Working Draft once it has closed all these issues.

Comments on this document are to be sent to the public public-ws-desc-comments@w3.org mailing list (public archive).

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 F. Part 1 Change Log.

Publication as a Working Draft 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. URI References for WSDL 2.0 Components (Non-Normative)
D. Migrating from WSDL 1.1 to WSDL 2.0 (Non-Normative)
E. Examples of Specifications of Extension Elements for Alternative Schema Language Support. (Non-Normative)
F. Part 1 Change Log (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 Prefixes and Namespaces Used in This Specification
        1.4.4 Terms Used in This Specification
        1.4.5 XML Information Set Properties
        1.4.6 WSDL 2.0 Component Model Properties
        1.4.7 Z Notation
        1.4.8 BNF Pseudo-Schemas
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 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]
            2.4.2.4 safe 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 uri 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 uri 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
            2.14.1.1 Operation Name Mapping (non-normative)
        2.14.2 XML Representation of Service Component
            2.14.2.1 Service References
            2.14.2.2 name attribute information item with service [owner element]
            2.14.2.3 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 Endpoint References
            2.15.2.2 name attribute information item with endpoint [owner element]
            2.15.2.3 binding attribute information item with endpoint [owner element]
            2.15.2.4 address attribute information item with endpoint [owner element]
            2.15.2.5 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
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
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 wsdl.interface(interface)
        A.2.2 wsdl.interfaceFault(interface/fault)
        A.2.3 wsdl.interfaceOperation(interface/operation)
        A.2.4 wsdl.interfaceMessageReference(interface/operation/message)
        A.2.5 wsdl.interfaceFaultReference(interface/operation/message/fault)
        A.2.6 wsdl.binding(binding)
        A.2.7 wsdl.bindingFault(binding/fault)
        A.2.8 wsdl.bindingOperation(binding/operation)
        A.2.9 wsdl.bindingMessageReference(binding/operation/message)
        A.2.10 wsdl.bindingFaultReference(binding/operation/fault/message)
        A.2.11 wsdl.service(service)
        A.2.12 wsdl.endpoint(service/endpoint)
        A.2.13 wsdl.feature(parent/feature)
        A.2.14 wsdl.property(parent/property)
        A.2.15 wsdl.extension(extension-namespace, extension-specific-syntax)
    A.3 Security considerations
B. Acknowledgements (Non-Normative)
C. URI References for WSDL 2.0 Components (Non-Normative)
    C.1 WSDL 2.0 URIs
    C.2 Example
D. Migrating from WSDL 1.1 to WSDL 2.0 (Non-Normative)
    D.1 Operation Overloading
    D.2 PortTypes
    D.3 Ports
    D.4 Single Interface per Service
E. Examples of Specifications of Extension Elements for Alternative Schema Language Support. (Non-Normative)
    E.1 DTD
        E.1.1 namespace attribute information item
        E.1.2 location attribute information item
        E.1.3 References to Element Definitions
    E.2 RELAX NG
        E.2.1 Importing RELAX NG
            E.2.1.1 ns attribute information item
            E.2.1.2 href attribute information item
        E.2.2 Inlining RELAX NG
            E.2.2.1 ns attribute information item
        E.2.3 References to Element Declarations
F. Part 1 Change Log (Non-Normative)
    F.1 WSDL 2.0 Specification Changes


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 criteria for a conformant processor of this language. The WSDL Version 2.0 Part 2: Adjuncts specification [WSDL 2.0 Adjuncts] describes extensions for Message Exchange Patterns, features, SOAP modules and bindings of features, 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/2005/05/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/2005/05/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.

It is not a requirement to support any particular serialization of the normative XML Infoset mapping of the component model for a WSDL 2.0 document. For instance, a conformant processor MAY only support XML 1.0 and not XML 1.1 [XML 1.1].

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. But it needs to 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”, “EQUIRED”, “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 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/2005/05/wsdl"

Defined by this specification.

wsdli

"http://www.w3.org/2005/05/wsdl-instance"

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

wrpc

"http://www.w3.org/2005/05/wsdl/rpc"

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

wsoap

"http://www.w3.org/2005/05/wsdl/soap"

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

whttp

"http://www.w3.org/2005/05/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].

1.4.4 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, a URI reference, etc.

Inlined Schema

An XML schema that is defined in a the xs:types element information item of a WSDL 2.0 description. For example, an XML 1.0 Schema defined in an xs:schema element information item 3.1.2 Inlining XML Schema.

1.4.5 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].

1.4.6 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.

1.4.7 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 preceeding 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 1.4.5 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 1.4.6 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.

1.4.8 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.

<!-- 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>

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.

Components are typed collections of properties that correspond to different aspects of Web services.

Editorial note  
Change property to avoid confusion with other meaning in spec.
Each subsection herein describes a different type of component, its defined properties, and its representation as an XML Infoset [XML Information Set].

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.

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.

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.

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.

The properties of the Description component are as follows:

  • {interfaces} OPTIONAL. A set of Interface components.

  • {bindings} OPTIONAL. A set of Binding components.

  • {services} OPTIONAL. A set of Service components.

  • {element declarations} OPTIONAL. A set of named element declarations, each one isomorphic to a global element declaration as defined by XML Schema.

  • {type definitions} OPTIONAL. A set of named type definitions, each one isomorphic to a global type definition as defined by XML Schema.

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

Imported components have different target namespace values from the Description component that is importing them. Thus importing is the mechanism to use components from one namespace in another set of definitions.

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/2005/05/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/2005/05/wsdl".

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

    1. An OPTIONAL documentation element information item (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/2005/05/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. Interfaces, Bindings and Services 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. The value of the targetNamespace attribute information item MUST be an absolute URI (see [IETF RFC 3986]).

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 (see 2.1.1 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 or imported 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 or imported 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 or imported Service components (see 4. Modularizing WSDL 2.0 descriptions).
{element declarations} The set of element declarations corresponding to all the element declarations defined as descendants of the types element information item, if any, plus any included or imported element declarations. 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 definitions corresponding to all the type definitions defined as descendants of the types element information item, if any, plus any included or imported type definitions. 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.

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:

  • {name} REQUIRED. An xs:QName.

  • {extended interfaces} OPTIONAL. A set of declared Interface components which this interface extends.

  • {interface faults} OPTIONAL. The set of declared Interface Fault components. The namespace name of the {name} property of each Interface Fault in this set MUST be the same as the namespace name of the {name} property of this Interface component.

  • {interface operations} OPTIONAL. A set of declared Interface Operation components. The namespace name of the {name} property of each Interface Operation in this set MUST be the same as the namespace name of the {name} property of this Interface component.

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

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

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

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 2.4.1.1 Operation Style) used to construct the {element} 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. Moreover, the value of the styleDefault attribute information item, if present, MUST contain absolute URIs (see [IETF RFC 3986]).

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 (see 2.2.1 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.

Note 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 2.4 Interface Operation.

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.

Note that faults other than the ones described in the Interface component can also be generated at run-time, i.e. faults are an open set.

The properties of the Interface Fault component are as follows:

  • {name} REQUIRED. An xs:QName.

  • {element declaration} OPTIONAL. A reference to an XML element declaration in the {element declarations} property of 2.1.1 The Description Component. This element represents the content or “payload” of the fault.

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

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

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

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.

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.

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 components is not sufficient to form the unique identity of an Interface Fault component.

In cases where, due to an interface extending one or more other interfaces, two or more Interface Faults 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 have the same value for their {name} properties but are not equivalent.

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.

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 (see 2.3.1 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 from the {element declarations} property of 2.1.1 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 a global element declaration from the {element declarations} property of 2.1.1 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 {inteface 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 URIs 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:

  • {name} REQUIRED. An xs:QName.

  • {message exchange pattern} REQUIRED. An xs:anyURI identifying the message exchange pattern used by the operation. This URI MUST be an absolute URI (see [IETF RFC 3986]).

  • {interface message references} OPTIONAL. A set of Interface Message Reference components for the ordinary messages the operation accepts or sends. (See 2.5 Interface Message Reference.)

  • {interface fault references} OPTIONAL. A set of Interface Fault Reference components for the fault messages the operation accepts or sends. (See 2.6 Interface Fault Reference.)

  • {style} OPTIONAL. A set of xs:anyURIs identifying the rules that were used to construct the {element} properties of {interface message references}. (See 2.4.1.1 Operation Style.) These URIs MUST be absolute URIs (see [IETF RFC 3986]).

  • {safety} REQUIRED. An xs:boolean indicating whether the operation is asserted to be safe (as defined in Section 3.5 of [Web Architecture]) for users of the described service to invoke. If this property is false, then no assertion has been made about the safety of the operation, thus the operation MAY or MAY NOT be safe. However, an operation SHOULD be marked safe if it meets the criteria for a safe interaction defined in Section 3.5 of [Web Architecture].

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

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

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

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.

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.

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.

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.

2.4.1.1 Operation Style

If the {style} property of an Interface Operation component has a value then that value (a set of URIs) implies the rules that were used to define the {element} properties (or other property which defines the content of the message properties; see 3.2 Using Other Schema Languages) of all the Interface Message Reference components which are members of the {message references} property of that component. Although a given operation style has the ability to constrain all input and output messages for an operation, it MAY choose to contrain only the former or the latter or any combination thereof.

Note that the property MAY not have any value. If this property has a value (a set of URIs), then for each individual URI that is an element of that set, the rules implied by that URI (such as rules that govern the schemas) MUST be followed or it is an error. So, if the set of URIs has more than one item in it, then the rules implied by ALL the URIs must be adhered to by the content definitions.

The WSDL Version 2.0 Part 2: Adjuncts specification [WSDL 2.0 Adjuncts] defines the following operation style:

  • RPC Style

2.4.2 XML Representation of Interface Operation Component

<description>
  <interface>
    <operation
          name="xs:NCName" 
          pattern="xs:anyURI"
          style="list of xs:anyURI"? 
          safe="xs:boolean"? >
      <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 URI.

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} 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 URI.

2.4.2.4 safe attribute information item with operation [owner element]

The safe attribute information item indicates whether the operation is declared to be safe or not.

The safe attribute information item has the following Infoset properties:

  • A [local name] of safe

  • A [namespace name] which has no value

The type of the safe attribute information item is xs:boolean and does not have a default value.

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
{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 URIs in the actual value of the style attribute information item if present, otherwise the set containing the URIs in the actual value of the styleDefault attribute information item of the [parent] interface element information item if present, otherwise empty.
{safety} The actual value of the safe attribute information item if present, otherwise the value false.
{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

A 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} 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 2.1.1 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.

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.

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

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:

  • A [local name] of input or output

  • A [namespace name] of "http://www.w3.org/2005/05/wsdl"

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

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

    1. An OPTIONAL documentation element information item (see 5. Documentation).

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

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 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.


Table 2-5. Mapping from XML Representation to Interface Message Reference Component Properties
Property Value
{message label} The actual value of the messageLabel attribute information item if any; otherwise the {message label} property of the message with same {direction} from the {message exchange pattern} of the Interface Operation component, provided there is exactly one such message; otherwise it is an error.
{direction} If the [local name] of the element information item is input then "in", else if the [local name] of the element information item is output then "out".
{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 from the {element declarations} property of 2.1.1 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 a global element declaration from the {element declarations} property of 2.1.1 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 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 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 two fault patterns that a given message exchange pattern may use. For the pattern 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 pattern 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 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 rule used in the message exchange pattern of the operation. For example, if the fault rule fault-replaces-message is used, then a fault which refers to an outgoing message would have a {direction} property value of out. On the other hand, if the fault rule message-triggers-fault is used, then a fault which 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.

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:

  • A [local name] of infault or outfault

  • A [namespace name] of "http://www.w3.org/2005/05/wsdl"

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

    • A REQUIRED ref attribute information item as described below in 2.6.2.1 ref attribute information item with infault, or outfault [owner element].

    • An OPTIONAL messageLabel attribute information item as described below in 2.6.2.2 messageLabel attribute information item with infault, or outfault [owner element].

      If the {message exchange pattern} of the Interface Operation component has only one message with a given value for {direction}, the messageLabel attribute information item is optional for the XML representation of any Interface Fault Reference component with the same value for {direction} (if the fault pattern of the {message exchange pattern} is fault-replaces-message) or of any Fault Reference component with the opposite value for {direction} (if the fault pattern is message-triggers-fault).

    • Zero or more namespace qualified attribute information items whose [namespace name] is NOT "http://www.w3.org/2005/05/wsdl".

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

    1. An OPTIONAL documentation element information item (see 5. Documentation).

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

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 to which this fault is related to.

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.

2.6.3 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.


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, whose {name} property is the actual value of the ref attribute information item.
{message label} The actual value of the messageLabel attribute information item if any; otherwise the {message label} property of the message with the same {direction} from the {message exchange pattern} of the Interface Operation component, provided there is exactly one such message and the fault pattern of the {message exchange pattern} is fault-replaces-message; otherwise the {interface message reference} property of the message with the opposite {direction}, provided there is exactly one such message and the fault pattern is message-triggers-fault; otherwise it is an error.
{direction} If the [local name] of the element information item is infault then "in", else if the [local name] of the element information item is outfault then "out".
{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 a client that interacts with the service to use that feature. Each Feature is identified by its URI.

WSDL 2.0's feature concept is derived from SOAP 1.2's abstract feature concept ([SOAP 1.2 Part 1: Messaging Framework]). Thus, by definition, every SOAP 1.2 abstract feature is also a WSDL 2.0 feature and does not have to be declared as such.

The properties of the Feature component are as follows:

  • {uri} REQUIRED. An xs:anyURI. This URI MUST be absolute as defined by [IETF RFC 3986]. This URI 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 {uri} URI. Otherwise, the client MAY use the Feature that is identified by the {uri} URI. In either case, if the client does use the Feature that is identified by the {uri} URI, 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.

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

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.

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

  • Interface component: all features asserted within the interface component.

  • Interface Fault component: all features asserted within the interface fault component and those within the [parent] interface component.

  • Interface Operation component: all features asserted within the interface operation component and those within the [parent] interface component.

  • Interface Message Reference component: all features asserted within the interface message reference component, those within the [parent] interface operation component and those within its [parent] interface component.

  • Interface Fault Reference component: all features asserted within the fault reference component, those within the [parent] interface operation component and those within its [parent] interface component.

  • Binding component: all features asserted within the binding component and those within the interface component referred to by the binding component (if any).

  • Binding Fault component: all features asserted within the binding fault component, those within the [parent] binding component, those within the corresponding interface fault component, and those within the interface component referred to by the binding component (if any).

  • Binding Operation component: all features asserted within the binding operation component, those within the [parent] binding component, those within the corresponding interface operation component, and those within the interface component referred to by the binding component.

  • Binding Message Reference component: all features asserted within the binding message reference component, those within the [parent] binding operation component, those within its [parent] binding component, those within the corresponding message reference component, and those within the interface component referred to by the binding component.

  • Binding Fault Reference component: all features asserted within the binding fault reference component, those within the [parent] binding operation component, those within its [parent] binding component, those within the corresponding fault reference component, and those within the interface component referred to by the binding component.

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/2005/05/wsdl
     xmlns:ns1="http://example.com/bank">
  <interface name="ns1:Bank">
    <!-- All implementations of this interface must be secure -->
    <feature uri="http://example.com/secure-channel"
             required="true"/>
    <operation name="withdrawFunds">
      <!-- This operation must have ACID properties -->
      <feature uri="http://example.com/transaction"
               required="true"/>
      ...
    </operation>
    <operation name="depositFunds">
      <!-- This operation requires notarization -->
      <feature uri="http://example.com/notarization"
               required="true"/>
      ...
    </operation>
  </interface>

  <binding name="ns1:BankSOAPBinding">
    <!-- This particular binding requires ISO9001
         compliance to be verifiable -->
    <feature uri="http://example.com/ISO9001"
             required="true"/>
    <!-- This binding also requires notarization -->
    <feature uri="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
      uri="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/2005/05/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. An OPTIONAL documentation element information item (see 5. Documentation).

    2. Zero or more namespace-qualified element information items whose [namespace name] is NOT "http://www.w3.org/2005/05/wsdl".

2.7.2.1 uri attribute information item with feature [owner element]

The uri attribute information item specifies the URI of the feature.

The uri attribute information item has the following Infoset properties:

  • A [local name] of uri

  • A [namespace name] which has no value

The type of the uri 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
{uri} The actual value of the uri 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 URIs precisely to allow this type of sharing.

The properties of the Property component are as follows:

  • {uri} REQUIRED. An xs:anyURI. This URI MUST be absolute as defined by [IETF RFC 3986]. This URI 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 in the {type definitions} property of 2.1.1 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.

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

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.

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 (URIs) to constraints. Each property URI 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.

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

  • Interface component: all properties asserted within the interface component.

  • Interface Fault component: all properties asserted within the interface fault component and those within the [parent] interface component.

  • Interface Operation component: all properties asserted within the interface operation component and those within the [parent] interface component.

  • Interface Message Reference component: all properties asserted within the message reference component, those within the [parent] interface operation component and those within its [parent] interface component.

  • Binding component: all properties asserted within the binding component and those within the interface component referred to by the binding component (if any).

  • Binding Fault component: all properties asserted within the binding fault component, those within the [parent] binding component, those within the corresponding interface fault component, and those within the interface component referred to by the binding component (if any).

  • Binding Operation component: all properties asserted within the binding operation component, those within the [parent] binding component, those within the corresponding interface operation component, and those within the interface component referred to by the binding component.

  • Binding Message Reference component: all properties asserted within the binding message reference component, those within the [parent] binding operation component, those within its [parent] binding component, those within the corresponding interface message reference component, and those within the interface component referred to by the binding component.

  • Binding Fault Reference component: all properties asserted within the binding fault reference component, those within the [parent] binding operation component, those within its [parent] binding component, those within the corresponding fault reference component, and those within the interface component referred to by the binding component.

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
      uri="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 uri attribute information item with property [owner element]

The uri attribute information item specifies the URI of the property. It has the following Infoset properties:

  • A [local name] of uri

  • A [namespace name] which has no value

The type of the uri 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/2005/05/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/2005/05/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
{uri} The actual value of the uri attribute information item.
{value constraint} If the constraint element information item is present, the type definition from the {type definitions} property of 2.1.1 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 re-usable 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 which 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 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 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 URI MUST be absolute as defined by [IETF RFC 3986]. The value of this URI 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.

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

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:

  • {interface fault} REQUIRED. An Interface Fault component in the {interface faults} property of the Interface component identified by the {interface} property of the [parent] Binding component, or an Interface component that that Interface component directly or indirectly extends. This is the Interface Fault component for which binding information is being specified.

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

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

  • {parent} REQUIRED. The Binding component that contains this component in its {binding faults} property.

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

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/2005/05/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. An OPTIONAL documentation element information item (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 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:

  • {interface operation} REQUIRED. An Interface Operation component in the {interface operations} property of the Interface component identified by the {interface} property of the [parent] Binding component, or an Interface component that that Interface component directly or indirectly extends. This is the Interface Operation component for which binding information is being specified.

  • {binding message references} OPTIONAL. A set of Binding Message Reference components.

    Editorial note: TODO - Editorial fix ME28 20050503
    This will be so counter-intuitive for WSDL 1.1 readers that it bears repeating the motivation for this in 2.9.1.
  • {binding fault references} OPTIONAL. A set of Binding Fault Reference components.

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

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

  • {parent} REQUIRED. The Binding component that contains this component in its {binding operations} property.

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.

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 (see 2.11.1 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 messages 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:

  • {interface message reference} REQUIRED. An Interface Message Reference component among those in the {interface message references} property of the Interface Operation component being bound by the containing Binding Operation component.

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

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

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

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.

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:

  • A [local name] of input or output .

  • A [namespace name] of "http://www.w3.org/2005/05/wsdl".

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

    • An OPTIONAL messageLabel attribute information item as described below in 2.12.2.1 messageLabel attribute information item with input or output [owner element].

      If the {message exchange pattern} of the Interface Operation component being bound has only one message with a given value for {direction}, then the messageLabel attribute information item is optional for the XML representation of the Binding Message Reference component with that {direction}.

    • Zero or more namespace qualified attribute information items whose [namespace name] is NOT "http://www.w3.org/2005/05/wsdl".

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

    1. An OPTIONAL documentation element information item (see 5. Documentation).

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

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 (see 2.12.1 The Binding Message Reference Component) is as described in Table 2-12.


Table 2-12. Mapping from XML Representation to Binding Message Reference Component Properties
Property Value
{interface message reference} Define the set of eligible message reference components as the set of Interface Message Reference components listed under the {interface message references} property of the Interface operation component being bound such that their {direction} property matches the one denoted by the [local name] of the element information item, i.e. whose {direction} is in if the [local name] of the element information item is input , resp. out if it is output . If the messageLabel attribute information item has a value, then the Interface Message Reference component among the eligible message reference components with the same {messageLabel} property; otherwise, the Interface Message Reference component among the eligible message reference components, provided there is exactly one such component; otherwise error.
{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:

  • {interface fault reference} REQUIRED. A Interface Fault Reference component among those in the {interface fault references} property of the Interface Operation component being bound by the containing Binding Operation component.

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

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

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

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.

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 (see 2.13.1 The Binding Fault Reference Component) is as described in Table 2-13.


Table 2-13. Mapping from XML Representation to Binding Fault Reference Component Properties
Property Value
{interface fault reference} Define the set of eligible interface fault reference components as the set of Interface Fault Reference components listed under the {interface fault references} property of the Interface operation component being bound such that (1) their {direction} property matches the one denoted by the [local name] of the element information item, i.e. whose {direction} is in if the [local name] of the element information item is infault , resp. out if it is outfault , and (2) the Interface Fault components referred to by their {interface fault reference} property have a {name} property whose value is equal to the value of the ref attribute information item of the element information item. If the messageLabel attribute information item has a value, then the Interface Fault Reference component among the eligible fault reference components with the same {messageLabel} property; otherwise, the Interface Fault Reference component among the eligible fault reference components, provided there is exactly one such component; otherwise error.
{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:

  • {name} REQUIRED. An xs:QName.

  • {interface} REQUIRED. An Interface component.

  • {endpoints} REQUIRED. A non-empty set of Endpoint components.

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

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

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

2.14.1.1 Operation Name Mapping (non-normative)

Note:

This section is best-practice and hence non-normative.

It is generally desirable that, when a message recipient receives a message, it knows how to handle the message. In WSDL 2.0 terms, this means being able to map back the message to a single Interface Operation. However, this is NOT always possible. There are cases when multiple Interface Operations could correspond to the same received message. This happens either when:

  • the {message content model} property of any of these Interface Message Reference components (see below) has a value of “#any”; or

  • more than one of these Interface Message Reference components (see below) has a value of “#none”; or

  • the qualified names of the global element declarations specified by the values of the {element declaration} properties of these Interface Message Reference components (see below) are NOT unique when considered together.

The Interface Message Reference components above are defined as follows. First, consider the Interface component specified in the {interface} property of a Service component. Second, consider all Interface Operation components specified in the {interface operations} property of that Interface component and the Interface component it directly or indirectly extends. Third, consider all Interface Message Reference components specified in the {interface message references} properties of said Interface Operation components. Fourth, consider the Interface Message Reference components that have the same value for their {direction} property (i.e., either the token in or the token out). These are the Interface Message Reference components considered above.

If any of the three cases above arise, then one of the following two alternatives can be used. Note these alternatives are in no way mandated by this specification and are considered best practice only.

  • Feature. The {features} property of the Service or Interface components contains a Feature component, having a {required} property with a value of true. The feature unambiguously identifies the mechanism that a message sender is required to support in order to enable the message recipient to unambiguously determine the name of the Interface Operation component that is intended to be associated with the received message.

  • Extension. The element information item for the Interface component contains an extension element (i.e., an element that is not in the http://www.w3.org/2005/05/wsdl namespace), having a wsdl:required attribute information item with a value of "true". The extension element unambiguously identifies the mechanism that a message sender is required to support in order to enable the message recipient to unambiguously determine the name of the Interface Operation component that is intended to be associated with the received message.

The WS-Addressing [WS-Addressing] speficiation allready provides a disambiguation mechanism. It defines an [action] property whose value is embedded in each message, and that can be used to associate the message with a particular operation.

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 Service References

Note that ServiceType , which is the XML Schema [XML Schema: Structures] complex type of the element information item service as defined in the WSDL 2.0 schema, MAY be used as the basis for defining new elements which can be used as service references in message exchanges. In the case that the message contains a reference to a service that implements a known interface, an element whose type restricts the complex type ServiceType to have a fixed value for the attribute information item interface MAY be used. To enable such reuse, the WSDL 2.0 schema defines the attribute information item name as optional in complex type ServiceType , while it is REQUIRED for the element information item service as indicated above.

Note:

See the primer [WSDL 2.0 Primer] for more information and examples.

2.14.2.2 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.

2.14.2.3 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 (see 2.14.1 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] 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.

2.15 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 properties of the Endpoint component are as follows:

  • {name} REQUIRED. An xs:NCName.

  • {binding} REQUIRED. A named Binding component.

  • {address} OPTIONAL. An xs:anyURI. This URI MUST be absolute as defined by [IETF RFC 3986]. 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.

For each Endpoint component in the {endpoints} property of a Service component, the {binding} property (see 2.15.1 The Endpoint Component) MUST either be a Binding component with an unspecified {interface} property (see 2.9.1 The Binding Component or a Binding component with an {interface} property equal to the {interface} property of the Service component.

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

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 Endpoint References

Note that EndpointType , which is the XML Schema [XML Schema: Structures] complex type of the element information item endpoint as defined in the WSDL 2.0 schema, MAY be used as the basis for defining new elements which can be used as endpoint references in message exchanges. In the case that the message contains a reference to an endpoint that implements a known binding, an element whose type restricts the complex type EndpointType to have a fixed value for the attribute information item binding MAY be used. To enable such reuse, the WSDL 2.0 schema defines the attribute information item name as optional in complex type EndpointType , while it is REQUIRED for the element information item endpoint as indicated above.

Note:

See the primer [WSDL 2.0 Primer] for more information and examples.

2.15.2.2 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.

2.15.2.3 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.

2.15.2.4 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.

2.15.2.5 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 (see 2.15.1 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 Features 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

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 the second component has no additional properties.

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 they contain corresponding equivalent values, without regard to order.

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

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

3. Types

<description>
  <types>
    <documentation />?
    [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 required of all WSDL 2.0 processors (see 3.1 Using W3C XML Schema Description Language).

The schema components contained in the {element declarations} property of 2.1.1 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 2.1.1 The Description Component.

The schema components contained in the {type definitions} property of 2.1.1 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 2.1.1 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. All WSDL 2.0 processors MUST support XML Schema type definitions.

A WSDL 2.0 description MUST NOT refer to XML Schema components in a given namespace unless an xs:import and/or xs:schema statement for that namespace is present. That is, using the xs:import and/or xs:schema constructs is a necessary condition for making XML Schema components available to a WSDL 2.0 description.

Table 3-1 summarize the visibility of schema components.


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

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 some additional restrictions. The schema components defined in the imported namespace are available for reference by QName (see 2.19 QName resolution). Note that only components in the imported namespace are available for reference 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 and the values of these two attribute information items MUST be identical. It is an error to 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 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 available to WSDL 2.0 for reference by QName (see 2.19 QName resolution). Note that only components defined and declared in the schema itself and components included by it via xs:include are available to WSDL 2.0. Specifically components that the schema imports via xs:import are NOT available to WSDL 2.0.

Similarly, components defined in an inlined XML schema are NOT automatically made available to a WSDL 2.0 description that imported (using wsdl:import ) the description 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 descriptions be placed in separate 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].

Note: It is NOT an error to import two or more schemas from the same targetNamespace . It is the responsibility of the underlying 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 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 may be referenced 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 may be referenced from a Property component.

A named, global xs:element declaration may be referenced 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 may be referenced 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, 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 2.1.1 The Description Component (and extensibility attributes) to hold the components of the referenced type system. It is expected that additional extensibility attributes for 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.

See E. Examples of Specifications of Extension Elements for Alternative Schema Language Support. for examples of using other schema languages. These examples reuse the {element declarations} property of 2.1.1 The Description Component and the element attribute information items of the wsdl:input , wsdl:output and wsdl:fault element information items.

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 which can be merged as needed.

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 includes 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. Processors are encouraged to keep track of the source of component definitions, so that multiple, mutual, and circular includes do not require establishing identity on a component-by-component basis.

The include element information item has:

  • A [local name] of include .

  • A [namespace name] of "http://www.w3.org/2005/05/wsdl".

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

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

    • An optional documentation element information item (see 5. Documentation).

    • Zero or more namespace-qualified element information items whose [namespace name] is NOT "http://www.w3.org/2005/05/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 URI 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 ws:description element information item, WSDL 2.0 documents 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 URI 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 xs:import element information item (see [XML Schema: Structures], section 4.2.3 "References to schema components across namespaces"). The WSDL 2.0 ws:import element information item identifies namespaces used in foreign references. The existence of the WSDL 2.0 ws:import element information item signals that the WSDL 2.0 document may contain references to foreign components. The ws:import element information item is therefore like a forward declaration for other namespaces.

Using the 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 import element information item for that foreign namespace.

This specification does not preclude repeating the 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 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 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 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/2005/05/wsdl".

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

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

    • An optional documentation element information item (see 5. Documentation).

    • Zero or more namespace-qualified element information items whose [namespace name] is NOT "http://www.w3.org/2005/05/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 . The actual value of the location attribute information item, if present on a WSDL 2.0 import element information item, gives a hint as to where a serialization of a WSDL 2.0 document with definitions for the imported namespace may 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.

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 URI and its element name. The meaning of an extension SHOULD be defined (directly or indirectly) in a document that is available at its namespace URI.

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/2005/05/wsdl" to appear among the [children] of specific element information items whose [namespace name] is "http://www.w3.org/2005/05/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".

Editorial note: TODO - Editorial comment ME29 20050503
Are you still using element substitution groups?

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/2005/05/wsdl".

  • A [specified] property with a value of "true".

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

6.2 Attribute-based Extensibility

WSDL 2.0 allows qualified attribute information items whose [namespace name] is NOT "http://www.w3.org/2005/05/wsdl" to appear on any element information item whose namespace name IS "http://www.w3.org/2005/05/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 supercede 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/2005/05/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/2005/05/wsdl-instance" namespace can be found at http://www.w3.org/2005/05/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/2005/05/wsdl-instance".

The type of the wsdlLocation attribute information item is a list xs:anyURI. Its actual value MUST be a list of pairs of URIs; where the first URI of a pair, which MUST be an absolute URI as defined in [IETF RFC 3986], indicates a WSDL 2.0 namespace name, and, the second a hint as to the location of a WSDL 2.0 document defining WSDL 2.0 components for that namespace name. The second URI of a pair MAY be absolute or relative.

8. Conformance

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

    <property uri="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.
[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 XML Information Set 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. (See http://www.ietf.org/rfc/rfc3023.txt.)
[WSDL MediaType]
IETF Internet Draft "The 'application/wsdl+xml' media type", @@@. (Work to be done once we have consensus on the media type).
[WSDL 2.0 Adjuncts]
Web Services Description Language (WSDL) Version 2.0 Part 2: Adjuncts , M. Gudgin, H. Haas, P. Le Hégaret, A. Lewis, J-J. Moreau, D. Orchard, J. Schlimmer, S. Weerawarana, Editors. World Wide Web Consortium, 3 August 2004. This version of the "Web Services Description Language (WSDL) Version 2.0 Part 2: Adjuncts" Specification is available at http://www.w3.org/TR/2005/WD-wsdl20-adjuncts-20050510. 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 Working Draft, 25 February 2004. Available at http://www.w3.org/TR/charmod/.
[TAG URI FINDING]
TAG Finding on URI Comparison, X. Foo, Y. Bar, Authors. W3C Technical Architecture Group, Month, Year. Draft available at http://www.textuality.com/tag/uri-comp-4.
[Web Architecture]
Architecture of the World Wide Web, First Edition, Ian Jacobs, Editor. W3C Technical Architecture Group, December, 2003. Available at http://www.w3.org/TR/2003/WD-webarch-20031209/.
[ISO/IEC 10646]
ISO/IEC 10646-1:2000. Information technology -- Universal Multiple-Octet Coded Character Set (UCS) -- Part 1: Architecture and Basic Multilingual Plane (See http://www.iso.ch for the latest version.)
[Unicode]
The Unicode Consortium, The Unicode Standard, Version 4, ISBN 0-321-18578-1, as updated from time to time by the publication of new versions. (See http://www.unicode.org/unicode/standard/versions for the latest version and additional information on versions of the standard and of the Unicode Character Database).
[Character Model]
Character Model for the World Wide Web 1.0: Fundamentals, Martin J. Dürst, François Yergeau, Richard Ishida, Misha Wolf, Tex Texin, editors, World Wide Web Consortium, 22 November 2004, available at http://www.w3.org/TR/charmod/.

10.2 Informative References

[WS-Addressing]
Web Services Addressing - Core, Martin Gudgin, Marc Hadley, Editors. W3C Working Draft 8 December 2004. Available at http://www.w3.org/TR/2004/WD-ws-addr-core-20041208/.
[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 1.1]
Simple Object Access Protocol (SOAP) 1.1, D. Box, D. Ehnebuske, G. Kakivaya, A. Layman, N. Mendelsohn, H. Frystyk Nielsen, S. Thatte, D. Winer, Editors. World Wide Web Consortium, 8 May 2000. This version of the Simple Object Access Protocol 1.1 Note is http://www.w3.org/TR/2000/NOTE-SOAP-20000508.
[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/.
[XML Linking]
XML Linking Language (XLink) Version 1.0, S. DeRose, E. Maler, D. Orchard, Editors. World Wide Web Consortium, 27 June 2001. This version of the XML Linking Language 1.0 Recommendation is http://www.w3.org/TR/2001/REC-xlink-20010627. The latest version of XML Linking Language 1.0 is available at http://www.w3.org/TR/xlink.
[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 (WSDL) Version 2.0: Primer, K. Sankar, K. Liu, D. Booth, Editors. World Wide Web Consortium, 10 May 2005. The editors' version of the Web Services Description Version 2.0: Primer document is available from http://www.w3.org/2002/ws/desc/.
[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.
[WSDL 2.0 RDF Mapping]
Web Services Description (WSDL) Version 2.0: RDF Mapping, XYZ, Editors. World Wide Web Consortium, 10 May 2005. This version of the "Web Services Description Version 2.0: RDF Mapping" Specification is available at http://www.w3.org/TR/2005/WD-wsdl20-adjuncts-20050510. The latest version of "Web Services Description Version 2.0: RDF Mapping" is available at http://www.w3.org/TR/wsdl20-adjuncts.
[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 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. It is referenced by the corresponding IANA registration document [WSDL MediaType], which is being submitted to the IESG for review, approval and registration with IANA.

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 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, URI, or Pointer Part depending on the context.

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 labelled 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
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 fault QName message NCName wsdl.bindingFaultReference(binding/operation/fault/message)
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 URI n/a n/a wsdl.feature(parent/feature)
Property parent Pointer Part property URI n/a n/a wsdl.property(parent/property)

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(extension-namespace, extension-specific-syntax)

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.

A.2.1 wsdl.interface(interface)

  1. interface is the local name of the {name} property of the Interface component.

A.2.2 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.

A.2.3 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.

A.2.4 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.

A.2.5 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 InterfaceFault Reference component.

A.2.6 wsdl.binding(binding)

  1. binding is the local name of the {name} property of the Binding component.

A.2.7 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.

A.2.8 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.

A.2.9 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.

A.2.10 wsdl.bindingFaultReference(binding/operation/fault/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. 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.

  4. 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.

A.2.11 wsdl.service(service)

  1. service is the local name of the {name} property of the Service component.

A.2.12 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.

A.2.13 wsdl.feature(parent/feature)

  1. parent is the pointer part of the parent component.

  2. feature is the {uri} property of the Feature component.

A.2.14 wsdl.property(parent/property)

  1. parent is the pointer part of the parent component.

  2. property is the {uri} property of the Property component.

A.2.15 wsdl.extension(extension-namespace, extension-specific-syntax)

  1. extension-namespace is the namespace that identifies the extension, e.g. for the WSDL 2.0 SOAP 1.2 Binding the namespace is http://www.w3.org/2005/05/wsdl/soap.

  2. extension-specific-syntax is defined by the extension. The owner of the extension must define any components contributed by the extension and a syntax for identifying them.

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.

Previous editors of this document were:

Members of the Working Group are (at the time of writing, and by alphabetical order): Rebecca Bergersen (IONA Technologies), Allen Brookes (Rogue Wave Softwave), Dave Chappell (Sonic Software), Helen Chen (Agfa-Gevaert N. V.), Roberto Chinnici (Sun Microsystems), Kendall Clark (University of Maryland), Ugo Corda (SeeBeyond), Glen Daniels (Sonic Software), Paul Downey (British Telecommunications), Youenn Fablet (Canon), Martin Gudgin (Microsoft Corporation), 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.), Bijan Parsia (University of Maryland), Tony Rogers (Computer Associates), Arthur Ryman (IBM), Adi Sakala (IONA Technologies), Igor Sedukhin (Computer Associates), Asir Vedamuthu (webMethods, Inc.), Sanjiva Weerawarana (Independent), 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).

The people who have contributed to discussions on www-ws-desc@w3.org are also gratefully acknowledged.

C. URI References for WSDL 2.0 Components (Non-Normative)

This appendix provides a syntax for URI references for all components found in a WSDL 2.0 document. The URI references are easy to understand and compare, while imposing no burden on the WSDL 2.0 author.

C.1 WSDL 2.0 URIs

There are two main cases for WSDL 2.0 URIs:

  • the URI of a WSDL 2.0 document

  • the URI of a WSDL 2.0 namespace

The URI 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 URI with the WSDL 2.0 fragment identifiers to form a URI-reference.

The URI in a URI-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 component. The URI 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. URI 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/2005/05/wsdl" 
    xmlns:xs="http://www.w3.org/2001/XMLSchema" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://www.w3.org/2005/05/wsdl http://www.w3.org/2005/05/wsdl/wsdl20.xsd">
        
    <wsdl:types>
        <xs:import schemaLocation="TicketAgent.xsd" 
                   namespace="http://example.org/TicketAgent.xsd" />
    </wsdl:types>
        
    <wsdl:interface name="TicketAgent">
            <feature uri="http://example.com/secure-channel" required="true"/>

        <wsdl:operation name="listFlights" pattern="http://www.w3.org/2005/05/wsdl/in-out">
            <wsdl:input element="xsTicketAgent:listFlightsRequest"/>
            <wsdl:output element="xsTicketAgent:listFlightsResponse"/>
        </wsdl:operation>
                
        <wsdl:operation name="reserveFlight" pattern="http://www.w3.org/2005/05/wsdl/in-out">
            <wsdl:input element="xsTicketAgent:reserveFlightRequest"/>
            <wsdl:output element="xsTicketAgent:reserveFlightResponse"/>
        </wsdl:operation>
    </wsdl:interface>
</wsdl:description>

Its components have the following URI-references:

Example C-2. URI References - Example URIs

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.operation(TicketAgent/listFlights) 
http://example.org/TicketAgent.wsdl20#wsdl.operation(TicketAgent/reserveFlight)

D. Migrating from WSDL 1.1 to WSDL 2.0 (Non-Normative)

This section will attempt to document some of the migration concerns of going from WSDL 1.1 to WSDL 2.0. We do not claim that all migration problems will be addressed here.

D.1 Operation Overloading

WSDL 1.1 supported operation overloading, whereas WSDL 2.0 does not.

D.2 PortTypes

Port types have been renamed to interfaces. We now have interface inheritance.

D.3 Ports

Ports have been renamed to endpoints.

D.4 Single Interface per Service

WSDL 2.0 requires that within a service, all endpoints (called ports in WSDL 1.1) implement exactly the same interface (called portType in WSDL 1.1). WSDL 1.1 imposed no such restriction. WSDL 1.1 documents could contain ports, from the same service, that implemented differents portTypes. Such WSDL 1.1 documents must therefore be converted, before they are valid WSDL 2.0 documents. Note: other types of conversions may also be required, because of other differences between WSDL 2.0 and WSDL 1.1. These differences are not considered further in this section.

To convert a WSDL 1.1 document that contains ports from the same service that implement different portTypes, one must first move each portType implementing a different port to a new service. The new service is a replica of the original service, apart from the fact that it implements a different set of portTypes.

Is is then generally desirable to indicate that the new services are related to each other. This can be achieved by using one of the following alternatives:

  • Single document. Keep the new services under the same definition element information item.

  • Multiple documents, same targetNamespace. Split the new services over multiple WSDL 2.0 documents, each with the same targetNamespace .

  • Multiple documents, same endpoint. Split the new services in multiple WSDL 2.0 documents, each with the same endpoint . Note that this provides a looser coupling that the targetNamespace alternative above.

  • Extension. Use a WSDL 2.0 extension whose semantics would be to link the new services together. This is somewhat analoguous to the targetNamespace approach above, although such an extension may carry additional semantics. The definition of such an extension is outside the scope of this specification.

E. Examples of Specifications of Extension Elements for Alternative Schema Language Support. (Non-Normative)

E.1 DTD

A DTD may be used as the schema language for WSDL 2.0. It may not be inlined; it must be imported. A namespace must be assigned. DTD types appear in the {element declarations} property of 2.1.1 The Description Component and may be referenced from the wsdl:input , wsdl:output and wsdl:fault elements using the element attribute information item.

The prefix, dtd, used throughout the following is mapped to the namespace URI "http://www.w3.org/2005/05/wsdl/dtd-import".

The dtd:import element information item references an external Document Type Definition, and has the following Infoset properties:

  • A [local name] of import.

  • A [namespace name] of "http://www.w3.org/2005/05/wsdl/dtd-import".

  • One or two attribute information items, as follows:

    • A REQUIRED namespace attribute information item as described below.

    • An OPTIONAL location attribute information item as described below.

E.1.1 namespace attribute information item

The namespace attribute information item sets the namespace to be used with all imported element definitions described in the DTD. It 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.

The WSDL 2.0 author should ensure that a prefix is associated with the namespace at the proper scope (probably document scope).

E.1.2 location attribute information item

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

  • A [local name] of location.

  • A [namespace name] which has no value.

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

E.1.3 References to Element Definitions

The element attribute information item MUST be used when referring to an element definition (<!ELEMENT>) from a Message Reference component; referring to an element definition from an Interface Fault component is similar. The value of the element definition MUST correspond to the content of the namespace attribute information item of the dtd:import element information item. The local name part must correspond to an element defined in the DTD.

Note that this pattern does not attempt to make DTDs namespace-aware. It applies namespaces externally, in the import phase.

E.2 RELAX NG

A RELAX NG schema may be used as the schema language for WSDL 2.0. It may be inlined or imported; import is preferred. A namespace must be specified; if an imported schema specifies one, then the [actual value] of the namespace attribute information item in the import element information item must match the specified namespace. RELAX NG provides both type definitions and element declarations, the latter appears in the {element declarations} property of 2.1.1 The Description Component respectively. The following discussion supplies the prefix rng which is mapped to the URI "http://www.relaxng.org/ns/structure/1.0".

E.2.1 Importing RELAX NG

Importing a RELAX NG schema uses the rng:include mechanism defined by RNG, with restrictions on its syntax and semantics. A child element information item of the types element information item is defined with the Infoset properties as follows:

  • A [local name] of include.

  • A [namespace name] of "http://www.relaxng.org/ns/structure/1.0".

  • Two attribute information items as follows:

    • A REQUIRED ns attribute information item as described below.

    • An OPTIONAL href attribute information item as described below.

    • Additional attribute information items as defined by the RNG specification.

Note that WSDL 2.0 restricts the rng:include element information item to be empty. That is, it cannot redefine rng:start and rng:define element information items; it may be used solely to import a schema.

E.2.1.1 ns attribute information item

The ns attribute information item defines the namespace of the type and element definitions imported from the referenced schema. If the referenced schema contains an ns attribute information item on its grammar element information item, then the values of these two attribute information items must be identical. If the imported grammar does not have an ns attribute information item then the namespace specified here is applied to all components of the schema as if it did contain such an attribute information item. The ns attribute information item contains the following Infoset properties:

  • A [local name] of ns.

  • A [namespace name] which has no value.

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

E.2.1.2 href attribute information item

The href attribute information item must be present, according to the rules of the RNG specification. However, WSDL 2.0 allows it to be empty, and considers it only a hint. Caching and cataloging technologies may provide better information that this hint. The href attribute information item has the following Infoset properties:

  • A [local name] of href.

  • A [namespace name] which has no value.

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

E.2.2 Inlining RELAX NG

Inlining an RNG schema uses the existing top-level rng:grammar element information item. It may be viewed as simply cutting and pasting an existing, stand-alone schema to a location inside the wsdl:types element information item. The rng:grammar element information item has the following Infoset properties:

  • A [local name] of grammar.

  • A [namespace name] of "http://www.relaxng.org/ns/structure/1.0".

  • A REQUIRED ns attribute information items as described below.

  • Additional attribute information items as specified for the rng:grammar element information item in the RNG specification.

  • Child element information items as specified for the rng:grammar element information item in the RNG specification.

E.2.2.1 ns attribute information item

The ns attribute information item defines the namespace of the type and element definitions inlined in this schema. WSDL 2.0 modifies the RNG definition of the rng:grammar element information item to make this attribute information item required. The ns attribute information item has the following Infoset properties:

  • A [local name] of ns.

  • A [namespace name] which has no value.

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

E.2.3 References to Element Declarations

Whether inlined or imported, the element definitions present in a schema may be referenced from an Interface Message Reference or Interface Fault component.

A named rng:define definition MUST NOT be referenced from the Message Reference or Interface Fault components.

A named Relax NG element declaration MAY be referenced from a Message Reference or Interface Fault component. The QName is constructed from the namespace (ns attribute information item) of the schema and the content of the name attribute information item of the element element information item An element attribute information item MUST NOT be used to refer to an rng:define element information item.

F. Part 1 Change Log (Non-Normative)

F.1 WSDL 2.0 Specification Changes


Date Author Description
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 properities.
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 declarion}

  • 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 identifer definition into the media registration appendix.
20050414 JJM Fixed XML Schema P1/P2 version listed in the bibliograpy 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 refered 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 D.4 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 SW Updated bindings.
20031025 SW Updated faults.
20031013 JJM Moved appendix C to a separate document, as per 24 Sep 2003 meeting in Palo Alto, CA.
20031003 SW Softened <documentation> wording to allow machine processable documentation.
20031002 SW Changed binding/operation/@name to QName per edtodo.
20030930 SW Added placeholders for set-attr/get-attr operation styles.
20030929 SW Inserted Glen Daniels' feature text.
20030919 RRC Removed import facility for chameleon schemas and added a description of a workaround.
20030918 JJM Changed message pattern to message exchange pattern, as per WG resolution on 18 Sep. 2003
20030916 RRC Added editorial note for the missing RPC encoding style.
20030915 RRC Yet more updates for REQUIRED, OPTIONAL; updated section 3 to reflect the removal of "wsdl:message".
20030911 RRC More updates for REQUIRED, OPTIONAL; removed diff markup; fixed example C.4.
20030911 RRC Renamed message reference "name" attribute and property to "messageReference"; fixed incorrect reference to "fault" element in the binding operation section.
20030910 SW Fixed message references and added proper use of REQUIRED etc. for the part I've gone through so far.
20030910 SW Updating spec; fixed up interface operation component more.
20030808 JCS Fixed errors found by IBM\Arthur.
20030804 JCS Removed Message component per 30 July-1 Aug meeting.
20030803 JCS Replaced substitution groups with xs:any namespace='##other' per 3 July, 17 July, and 24 July telecons.
20030801 JCS Made binding/@interface optional per 31 July meeting.
20030724 JCS Remove @targetResource per 17 July 2003 telecon.
20030612 JJM Incorporate revised targetResource definition, as per 12 June 2003 telcon.
20030606 JJM Refer to the two graphics by ID. Indicate pseudo-schemas are not normative.
20030604 JJM Fixed figures so they don't appear as tables. Fixed markup so it validates.
20030603 JCS Plugged in jmarsh auto-generated schema outlines
20030529 MJG Fixed various issues with the XmlRep portions of the spec
20030527 MJG Added text to 2.2.1 The Interface Component and 2.2.3 Mapping Interface's XML Representation to Component Properties indicating that recursive interface extension is not allowed.
20030523 JJM Added pseudo-syntax to all but Type and Modularizing sections.
20030523 JJM Added the "interface" and "targetResource" attribute on <service>.
20030523 JJM Fixed miscellaneous typos (semi-colon instead of colon, space after parenthesis, etc.).
20030523 JJM Rewrote the service-resource text and merge it with the introduction.
20030522 JCS s/set of parts/list of parts/.
20030514 JJM Updated the service-resource figure, and split the diagram into two.
20030512 JJM Added service-resource drawing and description.
20030512 JJM Added syntax summary for the Interface component.
20030428 MJG Various edits to 3. Types, E. Examples of Specifications of Extension Elements for Alternative Schema Language Support. to accommodate other type systems and spell out how extensibility elements/attributes play out in such scenarios.
20030428 MJG Added text to 1.4 Notational Conventions regarding normative nature of schema and validity of WSDL documents
20030411 JJM Allowed features and properties at the interface, interface operation, binding and binding operation levels, as agreed at the Boston f2f http://lists.w3.org/Archives/Public/www-ws-desc/2003Mar/0019.html.
20030411 JJM Incorporate features and properties' text from separate document and merged change logs
20030313 MJG Changed title to include 'part 1'
20030313 MJG Changed port to endpoint
20030313 MJG Changed type to interface in binding
20030313 MJG Changed mep to pattern and message exchange pattern to message pattern
20030313 MJG Added text to D.2 PortTypes
20030313 MJG Changed portType to interface
20030407 JJM Refined and corrected the definitions for features and properties.
20030304 JJM Filled in blank description of Feature and Property component.
20030303 MJG Skeleton Feature and Property components
20030305 MJG Merged ComponentModelForMEPs branch (1.46.2.5) into main branch (1.54). Below is change log from the branch:
20030220 MJG ComponentModelForMEPs: Minor wording change at suggestion of JJM
20030212 MJG ComponentModelForMEPs: Updated component model to include Fault Reference component. Associated changes to Port Type Operation component
20030211 MJG ComponentModelForMEPs: Changes to component model to support MEPs
20030228 MJG Updated 4.2 Importing Descriptions to be consistent in layout with other XML rep sections. Detailed that documentation and extensibility attributes are allowed, per schema
20030228 MJG Updated 4.1 Including Descriptions to be consistent in layout with other XML rep sections. Detailed that documentation and extensibility attributes are allowed, per schema
20030228 MJG Updated 2.9.2 XML Representation of Binding Component to list type attribute
20030217 MJG Minor edits to wording in 2.4.1 The Interface Operation Component
20030213 MJG Added xlink nsdecl to spec element
20030213 MJG Incorporated text from dbooths proposal on semantics, per decision 20021031
20030213 MJG Merged operationnames branch (1.37.2.3) into main branch (1.46). Below is the change log from the branch.
20030130 MJG operationnames: Updated binding section to match changes to port type section WRT operation names
20030130 MJG operationnames: Added best practice note on operation names and target namespaces to 2.4.1 The Interface Operation Component
20030122 MJG operationnames: Started work on making operations have unique names
20030213 MJG Change name of {message exchange pattern} back to {variety} to consolidate changes due to MEP proposal
20030206 MJG Updated Appendix A to refer to Appendix C
20030204 MJG Tidied up appendix C
20030203 MJG Incorporated resolution to R120
20030124 MJG Fixed error in 2.5.2 XML Representation of Interface Message Reference Component which had name attribute information item on input, output and fault element information item being mandatory. Made it optional.
20030123 JJM Change name of {variety} property to {message exchange pattern}
20030130 MJG Updated binding section to match changes to port type section WRT operation names
20030130 MJG Added best practice note on operation names and target namespaces to 2.4.1 The Interface Operation Component
20030122 MJG Started work on making operations have unique names
20030122 MJG Added some <emph>, <el>, <att>, &AII;, &EII;, <el> markup
20030120 MJG Incorporated Relax NG section from Amy's types proposal
20030120 MJG Incorporated DTD section from Amy's types proposal
2003020 MJG Incorporated Amy's types proposal except annexes
20030118 MJG Made some changes related to extensibility
20030118 MJG Amended content model for operation to disallow fault element children in the input-only and output-only cases
20030118 MJG Removed {extension} properties from Binding components and Port components. Added text relating to how extension elements are expected to annotate the component model.
20030117 MJG Made further edits related to extensibility model now using substitution groups
20030117 MJG Added initial draft of section on QName resolution
20030117 MJG Reworked section on extensibility
20030116 MJG Added text regarding multiple operations with the same {name} in a single port type
20030116 MJG Added section on symbol spaces
20030116 MJG Removed various ednotes
20030116 MJG Added section on component equivalence
20030116 MJG More work on include and import
20021201 MJG Did some work on wsdl:include
20021127 MJG Added placeholder for wsdl:include
20021127 MJG Cleaned up language concerning targetNamespace attribute information item 2.1.2.1 targetNamespace attribute information item
20021127 MJG changed the language regarding extensibility elements in 2.1.2 XML Representation of Description Component.
20021127 MJG Moved all issues into issues document ( ../issues/wsd-issues.xml )
20021127 MJG Removed name attribute from definitions element
20021127 MJG Removed 'pseudo-schema'
20021121 JJM Updated media type draft appendix ednote to match minutes.
20021111 SW Added appendix to record migration issues.
20021107 JJM Incorporated and started adapting SOAP's media type draft appendix.
20021010 MJG Added port type extensions, removed service type.
20020910 MJG Removed parameterOrder from spec, as decided at September 2002 FTF
20020908 MJG Updated parameterOrder description, fixed some spelling errors and other types. Added ednote to discussion of message parts
20020715 MJG AM Rewrite
20020627 JJM Changed a few remaining <emph> to either <att> or <el>, depending on context.
20020627 SW Converted portType stuff to be Infoset based and improved doc structure more.
20020627 SW Converted message stuff to be Infoset based and improved doc structure more.
20020625 SW Mods to take into account JJM comments.
20020624 JJM Fixed spec so markup validates.
20020624 JJM Upgraded the stylesheet and DTD
20020624 JJM Added sections for references and change log.
20020624 JJM Removed Jeffrey from authors :-( Added Gudge :-)
20020620 SW Started adding abstract model
20020406 SW Created document from WSDL 1.1