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The OWL Working Group intends to make OWL 2 be a superset of OWL 1, except for a limited number of situations where we believe the impact will be minimal. This means that OWL 2 will be backward compatible, and creators of OWL 1 documents need only move to OWL 2 when they want to make use of OWL 2 features. More details and advice concerning migration from OWL 1 to OWL 2 will be in future drafts.
The major change to this document since the version of 11 April 2008 reflects the major revamping of the functional syntax to disallow punning between classes and datatypes and between object, data, and annotation properties. Some minor changes were made to reflect changes in the Functional Syntax.
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This document defines an XML syntax for OWL 2, which mirrors the structural specification of OWL 2 [OWL 2 Specification].
The italicized keywords MUST, MUST NOT, SHOULD, SHOULD NOT, and MAY specify certain aspects of the normative behavior of OWL 2 tools, and are interpreted as specified in RFC 2119 [RFC 2119].
The syntax is defined by means of an XML schema [XML Schema], which is available as part of this document. The XML schema has been obtained by a straightforward translation of the structural specification of the OWL 2 Specification [OWL 2 Specification] in the following way:
The local parts of the names used in the XML Schema are the same as the names of their corresponding UML classes.
The XML schema thus captures the structure of OWL 2 entities, expressions, and axioms. Certain global conditions on OWL 2 ontologies, such as the ones described in Sections 5.9.1 and 10 of the OWL 2 Specification [OWL 2 Specification], cannot be captured in an XML schema. Tools parsing OWL 2 ontologies in this syntax need to additionally implement these global conditions.
As the XML syntax corresponds most closely to the structural specification of OWL 2 it is fully typed. It thus differs somewhat from the functional-style syntax of OWL 2 [OWL 2 Specification]. For example, whereas the functional-style syntax uses a nonterminal SomeValuesFrom for existential restrictions on both the object and data properties, the XML syntax provides two elements ox:ObjectSomeValuesFrom and ox:DataSomeValuesFrom.
Each axiom in the OWL 2 XML syntax contains complete information about the type of all the entities in it. Therefore the OWL 2 XML Syntax can be parsed more easily than by using the canonical parsing process from Section 5.9.3 of OWL 2 Specification [OWL 2 Specification]. Nonetheless, each OWL 2 ontology written in the OWL 2 XML syntax MUST satisfy the requirements on declarations and typing from Section 5.9 of the OWL 2 Specification [OWL 2 Specification] — that is, declarations for ontology entities MUST be present in the import closure of the ontology as required even if the type of ontology elements can be inferred from the axioms.
Relative URIs in an OWL 2 ontology written in XML syntax MUST be resolved as specified in the XML Base specification [XML Base]. If present, the xml:base on the ox:Ontology element MAY, but need not, be equal to the ontology and/or the version URI of the ontology. The ontology URI and the version URI, even if present, do not participate in the resolution of relative URIs. The expansion of relative URIs using xml:base is handled at the XML level during parsing, and is thus completely independent of the ontology and version URIs of the ontology being parsed.
The XML schema presented here covers the entire OWL 2 structural specification, and thus includes all the features available in OWL 2 profiles [OWL 2 Profiles]. There are no separate schemata for these profiles — that is, ontologies that can be expressed by the profiles MUST be written using the most general schema. Validating whether an ontology belongs to a particular profile is not intended to be performed using XML schema mechanisms, so the specification of such mechanisms is beyond the scope of this document.
The following is an example of an OWL 2 ontology written in XML syntax. More examples can be found in the OWL 2 Primer [OWL 2 Primer].
<?xml version="1.0" encoding="UTF-8"?>
<ox:Ontology
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.w3.org/ns/owl2-xml
http://www.w3.org/ns/owl2-xml/live-from-wiki.xsd"
xmlns:ox="http://www.w3.org/ns/owl2-xml"
xml:base="http://example.com/myOntology"
ox:ontologyURI="http://example.com/myOntology">
<ox:Import>http://example.com/someOtherOntology"</ox:Import>
<ox:Declaration>
<ox:OWLClass
ox:URI="#animal"/>
</ox:Declaration>
<ox:Declaration>
<ox:OWLClass
ox:URI="#tabloid"/>
</ox:Declaration>
<ox:Declaration>
<ox:ObjectProperty
ox:URI="#eats"/>
</ox:Declaration>
<ox:Declaration>
<ox:ObjectProperty
ox:URI="#reads"/>
</ox:Declaration>
<ox:SubClassOf>
<ox:OWLClass
ox:URI="#animal"/>
<ox:ObjectAllValuesFrom>
<ox:ObjectProperty ox:URI="#reads"/>
<ox:OWLClass ox:URI="#tabloid"/>
</ox:ObjectAllValuesFrom>
</ox:SubClassOf>
</ox:Ontology>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:ox="http://www.w3.org/ns/owl2-xml" targetNamespace="http://www.w3.org/ns/owl2-xml" elementFormDefault="qualified" attributeFormDefault="qualified"> <xsd:import namespace="http://www.w3.org/XML/1998/namespace" schemaLocation="http://www.w3.org/2001/xml.xsd"/> <!-- The ontology --> <xsd:element name="Import"> <xsd:complexType> <xsd:simpleContent> <xsd:extension base="xsd:anyURI"> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:extension> </xsd:simpleContent> </xsd:complexType> </xsd:element> <xsd:element name="Ontology"> <xsd:complexType> <xsd:sequence> <xsd:element ref="ox:Import" minOccurs="0" maxOccurs="unbounded"/> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:group ref="ox:Axiom" minOccurs="0" maxOccurs="unbounded"/> </xsd:sequence> <xsd:attribute name="ontologyURI" type="xsd:anyURI" use="optional"/> <xsd:attribute name="versionURI" type="xsd:anyURI" use="optional"/> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <!-- Entities, anonymous individuals, and literals --> <xsd:group name="Entity"> <xsd:choice> <xsd:element ref="ox:Class"/> <xsd:element ref="ox:Datatype"/> <xsd:element ref="ox:ObjectProperty"/> <xsd:element ref="ox:DataProperty"/> <xsd:element ref="ox:AnnotationProperty"/> <xsd:element ref="ox:NamedIndividual"/> </xsd:choice> </xsd:group> <xsd:element name="Class"> <xsd:complexType> <xsd:attribute name="URI" type="xsd:anyURI" use="required"/> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="Datatype"> <xsd:complexType> <xsd:attribute name="URI" type="xsd:anyURI" use="required"/> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="ObjectProperty"> <xsd:complexType> <xsd:attribute name="URI" type="xsd:anyURI" use="required"/> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="DataProperty"> <xsd:complexType> <xsd:attribute name="URI" type="xsd:anyURI" use="required"/> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="AnnotationProperty"> <xsd:complexType> <xsd:attribute name="URI" type="xsd:anyURI" use="required"/> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:group name="Individual"> <xsd:choice> <xsd:element ref="ox:NamedIndividual"/> <xsd:element ref="ox:AnonymousIndividual"/> </xsd:choice> </xsd:group> <xsd:element name="NamedIndividual"> <xsd:complexType> <xsd:attribute name="URI" type="xsd:anyURI" use="required"/> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="AnonymousIndividual"> <xsd:complexType> <xsd:attribute name="nodeID" type="xsd:NCName" use="required"/> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="Literal"> <xsd:complexType> <xsd:simpleContent> <xsd:extension base="xsd:string"> <xsd:attribute name="datatypeURI" type="xsd:anyURI"/> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:extension> </xsd:simpleContent> </xsd:complexType> </xsd:element> <!-- Declarations --> <xsd:element name="Declaration"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:group ref="ox:Entity"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <!-- Object property expressions --> <xsd:group name="ObjectPropertyExpression"> <xsd:choice> <xsd:element ref="ox:ObjectProperty"/> <xsd:element ref="ox:InverseObjectProperty"/> </xsd:choice> </xsd:group> <xsd:element name="InverseObjectProperty"> <xsd:complexType> <xsd:sequence> <xsd:element ref="ox:ObjectProperty"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <!-- Data property expressions --> <xsd:group name="DataPropertyExpression"> <xsd:sequence> <xsd:element ref="ox:DataProperty"/> </xsd:sequence> </xsd:group> <!-- Data ranges --> <xsd:group name="DataRange"> <xsd:choice> <xsd:element ref="ox:Datatype"/> <xsd:element ref="ox:DataComplementOf"/> <xsd:element ref="ox:DataOneOf"/> <xsd:element ref="ox:DatatypeRestriction"/> </xsd:choice> </xsd:group> <xsd:element name="DataComplementOf"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:DataRange"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="DataOneOf"> <xsd:complexType> <xsd:sequence> <xsd:element ref="ox:Literal" minOccurs="1" maxOccurs="unbounded"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="DatatypeRestriction"> <xsd:complexType> <xsd:sequence> <xsd:element ref="ox:Datatype"/> <xsd:element name="FacetRestriction" minOccurs="1" maxOccurs="unbounded"> <xsd:complexType> <xsd:sequence> <xsd:element ref="ox:Literal"/> </xsd:sequence> <xsd:attribute name="facet" type="xsd:anyURI" use="required"/> </xsd:complexType> </xsd:element> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <!-- Class expressions --> <xsd:group name="ClassExpression"> <xsd:choice> <xsd:element ref="ox:Class"/> <xsd:element ref="ox:ObjectIntersectionOf"/> <xsd:element ref="ox:ObjectUnionOf"/> <xsd:element ref="ox:ObjectComplementOf"/> <xsd:element ref="ox:ObjectOneOf"/> <xsd:element ref="ox:ObjectSomeValuesFrom"/> <xsd:element ref="ox:ObjectAllValuesFrom"/> <xsd:element ref="ox:ObjectHasValue"/> <xsd:element ref="ox:ObjectExistsSelf"/> <xsd:element ref="ox:ObjectMinCardinality"/> <xsd:element ref="ox:ObjectMaxCardinality"/> <xsd:element ref="ox:ObjectExactCardinality"/> <xsd:element ref="ox:DataSomeValuesFrom"/> <xsd:element ref="ox:DataAllValuesFrom"/> <xsd:element ref="ox:DataHasValue"/> <xsd:element ref="ox:DataMinCardinality"/> <xsd:element ref="ox:DataMaxCardinality"/> <xsd:element ref="ox:DataExactCardinality"/> </xsd:choice> </xsd:group> <xsd:element name="ObjectIntersectionOf"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:ClassExpression" minOccurs="2" maxOccurs="unbounded"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="ObjectUnionOf"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:ClassExpression" minOccurs="2" maxOccurs="unbounded"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="ObjectComplementOf"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:ClassExpression"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="ObjectOneOf"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Individual" minOccurs="1" maxOccurs="unbounded"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="ObjectSomeValuesFrom"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:ObjectPropertyExpression"/> <xsd:group ref="ox:ClassExpression"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="ObjectAllValuesFrom"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:ObjectPropertyExpression"/> <xsd:group ref="ox:ClassExpression"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="ObjectHasValue"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:ObjectPropertyExpression"/> <xsd:group ref="ox:Individual"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="ObjectExistsSelf"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:ObjectPropertyExpression"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="ObjectMinCardinality"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:ObjectPropertyExpression"/> <xsd:group ref="ox:ClassExpression" minOccurs="0" maxOccurs="1"/> </xsd:sequence> <xsd:attribute name="cardinality" type="xsd:nonNegativeInteger" use="required"/> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="ObjectMaxCardinality"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:ObjectPropertyExpression"/> <xsd:group ref="ox:ClassExpression" minOccurs="0" maxOccurs="1"/> </xsd:sequence> <xsd:attribute name="cardinality" type="xsd:nonNegativeInteger" use="required"/> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="ObjectExactCardinality"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:ObjectPropertyExpression"/> <xsd:group ref="ox:ClassExpression" minOccurs="0" maxOccurs="1"/> </xsd:sequence> <xsd:attribute name="cardinality" type="xsd:nonNegativeInteger" use="required"/> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="DataSomeValuesFrom"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:DataPropertyExpression" minOccurs="1" maxOccurs="unbounded"/> <xsd:group ref="ox:DataRange"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="DataAllValuesFrom"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:DataPropertyExpression" minOccurs="1" maxOccurs="unbounded"/> <xsd:group ref="ox:DataRange"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="DataHasValue"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:DataPropertyExpression"/> <xsd:element ref="ox:Literal"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="DataMinCardinality"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:DataPropertyExpression"/> <xsd:group ref="ox:DataRange" minOccurs="0" maxOccurs="1"/> </xsd:sequence> <xsd:attribute name="cardinality" type="xsd:nonNegativeInteger" use="required"/> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="DataMaxCardinality"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:DataPropertyExpression"/> <xsd:group ref="ox:DataRange" minOccurs="0" maxOccurs="1"/> </xsd:sequence> <xsd:attribute name="cardinality" type="xsd:nonNegativeInteger" use="required"/> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="DataExactCardinality"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:DataPropertyExpression"/> <xsd:group ref="ox:DataRange" minOccurs="0" maxOccurs="1"/> </xsd:sequence> <xsd:attribute name="cardinality" type="xsd:nonNegativeInteger" use="required"/> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <!-- Axioms --> <xsd:group name="Axiom"> <xsd:choice> <xsd:element ref="ox:Declaration"/> <xsd:group ref="ox:ClassAxiom"/> <xsd:group ref="ox:ObjectPropertyAxiom"/> <xsd:group ref="ox:DataPropertyAxiom"/> <xsd:element ref="ox:HasKey"/> <xsd:group ref="ox:Assertion"/> <xsd:element ref="ox:EntityAnnotation"/> <xsd:element ref="ox:AnonymousIndividualAnnotation"/> </xsd:choice> </xsd:group> <!-- Class expression axioms --> <xsd:group name="ClassAxiom"> <xsd:choice> <xsd:element ref="ox:SubClassOf"/> <xsd:element ref="ox:EquivalentClasses"/> <xsd:element ref="ox:DisjointClasses"/> <xsd:element ref="ox:DisjointUnion"/> </xsd:choice> </xsd:group> <xsd:element name="SubClassOf"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:group ref="ox:ClassExpression"/> <!-- This is the subexpression --> <xsd:group ref="ox:ClassExpression"/> <!-- This is the superexpression --> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="EquivalentClasses"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:group ref="ox:ClassExpression" minOccurs="2" maxOccurs="unbounded"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="DisjointClasses"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:group ref="ox:ClassExpression" minOccurs="2" maxOccurs="unbounded"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="DisjointUnion"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:element ref="ox:Class"/> <xsd:group ref="ox:ClassExpression" minOccurs="2" maxOccurs="unbounded"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <!-- Object property axioms --> <xsd:group name="ObjectPropertyAxiom"> <xsd:choice> <xsd:element ref="ox:SubObjectPropertyOf"/> <xsd:element ref="ox:EquivalentObjectProperties"/> <xsd:element ref="ox:DisjointObjectProperties"/> <xsd:element ref="ox:InverseObjectProperties"/> <xsd:element ref="ox:ObjectPropertyDomain"/> <xsd:element ref="ox:ObjectPropertyRange"/> <xsd:element ref="ox:FunctionalObjectProperty"/> <xsd:element ref="ox:InverseFunctionalObjectProperty"/> <xsd:element ref="ox:ReflexiveObjectProperty"/> <xsd:element ref="ox:IrreflexiveObjectProperty"/> <xsd:element ref="ox:SymmetricObjectProperty"/> <xsd:element ref="ox:AsymmetricObjectProperty"/> <xsd:element ref="ox:TransitiveObjectProperty"/> </xsd:choice> </xsd:group> <xsd:element name="SubObjectPropertyOf"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:choice> <!-- This is the subproperty expression or the property chain --> <xsd:group ref="ox:ObjectPropertyExpression"/> <xsd:element name="PropertyChain"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:ObjectPropertyExpression" minOccurs="2" maxOccurs="unbounded"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> </xsd:choice> <xsd:group ref="ox:ObjectPropertyExpression"/> <!-- This is the superproperty expression --> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="EquivalentObjectProperties"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:group ref="ox:ObjectPropertyExpression" minOccurs="2" maxOccurs="unbounded"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="DisjointObjectProperties"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:group ref="ox:ObjectPropertyExpression" minOccurs="2" maxOccurs="unbounded"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="ObjectPropertyDomain"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:group ref="ox:ObjectPropertyExpression"/> <xsd:group ref="ox:ClassExpression"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="ObjectPropertyRange"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:group ref="ox:ObjectPropertyExpression"/> <xsd:group ref="ox:ClassExpression"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="InverseObjectProperties"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:group ref="ox:ObjectPropertyExpression" minOccurs="2" maxOccurs="2"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="FunctionalObjectProperty"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:group ref="ox:ObjectPropertyExpression"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="InverseFunctionalObjectProperty"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:group ref="ox:ObjectPropertyExpression"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="ReflexiveObjectProperty"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:group ref="ox:ObjectPropertyExpression"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="IrreflexiveObjectProperty"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:group ref="ox:ObjectPropertyExpression"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="SymmetricObjectProperty"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:group ref="ox:ObjectPropertyExpression"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="AsymmetricObjectProperty"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:group ref="ox:ObjectPropertyExpression"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="TransitiveObjectProperty"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:group ref="ox:ObjectPropertyExpression"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <!-- Data property axioms --> <xsd:group name="DataPropertyAxiom"> <xsd:choice> <xsd:element ref="ox:SubDataPropertyOf"/> <xsd:element ref="ox:EquivalentDataProperties"/> <xsd:element ref="ox:DisjointDataProperties"/> <xsd:element ref="ox:DataPropertyDomain"/> <xsd:element ref="ox:DataPropertyRange"/> <xsd:element ref="ox:FunctionalDataProperty"/> </xsd:choice> </xsd:group> <xsd:element name="SubDataPropertyOf"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:group ref="ox:DataPropertyExpression"/> <!-- This is the subproperty expression --> <xsd:group ref="ox:DataPropertyExpression"/> <!-- This is the superproperty expression --> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="EquivalentDataProperties"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:group ref="ox:DataPropertyExpression" minOccurs="2" maxOccurs="unbounded"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="DisjointDataProperties"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:group ref="ox:DataPropertyExpression" minOccurs="2" maxOccurs="unbounded"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="DataPropertyDomain"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:group ref="ox:DataPropertyExpression"/> <xsd:group ref="ox:ClassExpression"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="DataPropertyRange"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:group ref="ox:DataPropertyExpression"/> <xsd:group ref="ox:DataRange"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="FunctionalDataProperty"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:group ref="ox:DataPropertyExpression"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <!-- Key axioms --> <xsd:element name="HasKey"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:group ref="ox:ClassExpression"/> <xsd:choice minOccurs="1" maxOccurs="unbounded"> <xsd:group ref="ox:ObjectPropertyExpression"/> <xsd:group ref="ox:DataPropertyExpression"/> </xsd:choice> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <!-- Assertions --> <xsd:group name="Assertion"> <xsd:choice> <xsd:element ref="ox:SameIndividual"/> <xsd:element ref="ox:DifferentIndividuals"/> <xsd:element ref="ox:ClassAssertion"/> <xsd:element ref="ox:ObjectPropertyAssertion"/> <xsd:element ref="ox:NegativeObjectPropertyAssertion"/> <xsd:element ref="ox:DataPropertyAssertion"/> <xsd:element ref="ox:NegativeDataPropertyAssertion"/> </xsd:choice> </xsd:group> <xsd:element name="SameIndividual"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:group ref="ox:Individual" minOccurs="2" maxOccurs="unbounded"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="DifferentIndividuals"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:group ref="ox:Individual" minOccurs="2" maxOccurs="unbounded"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="ClassAssertion"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:group ref="ox:ClassExpression"/> <xsd:group ref="ox:Individual"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="ObjectPropertyAssertion"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:group ref="ox:ObjectPropertyExpression"/> <xsd:group ref="ox:Individual"/> <!-- This is the source invididual --> <xsd:group ref="ox:Individual"/> <!-- This is the target individual --> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="NegativeObjectPropertyAssertion"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:group ref="ox:ObjectPropertyExpression"/> <xsd:group ref="ox:Individual"/> <!-- This is the source invididual --> <xsd:group ref="ox:Individual"/> <!-- This is the target individual --> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="DataPropertyAssertion"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:group ref="ox:DataPropertyExpression"/> <xsd:group ref="ox:Individual"/> <!-- This is the source invididual --> <xsd:element ref="ox:Literal"/> <!-- This is the target value --> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="NegativeDataPropertyAssertion"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:group ref="ox:DataPropertyExpression"/> <xsd:group ref="ox:Individual"/> <!-- This is the source invididual --> <xsd:element ref="ox:Literal"/> <!-- This is the target value --> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <!-- Annotations --> <xsd:element name="Annotation"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:element ref="ox:AnnotationProperty"/> <xsd:choice> <xsd:group ref="ox:Entity"/> <xsd:element ref="ox:AnonymousIndividual"/> <xsd:element ref="ox:Literal"/> </xsd:choice> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="Label"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:element ref="ox:Literal"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="Comment"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <xsd:element ref="ox:Literal"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="Deprecation"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:group name="Annotation"> <xsd:choice> <xsd:element ref="ox:Annotation"/> <xsd:element ref="ox:Label"/> <xsd:element ref="ox:Comment"/> <xsd:element ref="ox:Deprecation"/> </xsd:choice> </xsd:group> <!-- Annotation axioms --> <xsd:element name="EntityAnnotation"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <!-- This is the annotation for the axiom --> <xsd:group ref="ox:Entity"/> <xsd:group ref="ox:Annotation" minOccurs="1" maxOccurs="unbounded"/> <!-- This is the annotation for the entity --> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> <xsd:element name="AnonymousIndividualAnnotation"> <xsd:complexType> <xsd:sequence> <xsd:group ref="ox:Annotation" minOccurs="0" maxOccurs="unbounded"/> <!-- This is the annotation for the axiom --> <xsd:element ref="ox:AnonymousIndividual"/> <xsd:group ref="ox:Annotation" minOccurs="1" maxOccurs="unbounded"/> <!-- This is the annotation for the anonymous individual --> </xsd:sequence> <xsd:attributeGroup ref="xml:specialAttrs"/> </xsd:complexType> </xsd:element> </xsd:schema>