在RDF中,语句用S、P和O表示;在OWL中,owl:ObjectProperty代表谓词逻辑。
(S) (P) (O)
I like dog
<owl:Class rdf:about="Person" />
<owl:NamedIndividual rdf:about="I">
<rdf:type rdf:resource="Person"/>
<like rdf:resource="Dog"/>
</owl:NamedIndividual>
<owl:Class rdf:about="Pet" />
<owl:NamedIndividual rdf:about="Dog">
<rdf:type rdf:resource="Pet"/>
</owl:NamedIndividual>
<owl:ObjectProperty rdf:about="like">
<rdfs:domain>
<owl:Restriction>
<owl:onProperty rdf:resource="like"/>
<owl:someValuesFrom rdf:resource="Person"/>
</owl:Restriction>
</rdfs:domain>
<rdfs:range>
<owl:Restriction>
<owl:onProperty rdf:resource="like"/>
<owl:someValuesFrom rdf:resource="Pet"/>
</owl:Restriction>
</rdfs:range>
</owl:ObjectProperty>
那么如何描述我对狗的喜爱程度呢?如何给谓词赋予属性或值呢?一个解决方案是将一个(S,P,O)语句扩展为3个语句。例如:
(S) (P) (O)
Person isSrcOf LikeRelation
Pet isTargetOf LikeRelation
LikeRelation hasValue [0~100]
这应该可以运行,但很明显会让本体变大3倍 :(
非常感谢任何建议!