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RDF is also a vocabulary that along with the RDFS vocabulary provides a set of terms that can be used for creating general/abstract descriptions of resources. OWL is a vocabulary built with RDF and RDFS vocabularies that provide new terms for creating more detailed descriptions of resources.
The predicate of an RDF statement is the instance of rdf:Property identified by the predicate of the triple. The object of an RDF statement is the instance of rdfs:Resource identified by the object of the triple. rdf:Statement is in the domain of the properties rdf:predicate , rdf:subject and rdf:object .
3.1. For individuals it means that they either have the same URI reference or are defined as being the same individual (see owl:sameAs).
In an ontology, the class hierarchy framework can be extended with more open-ended relationships, called object and data properties. Object properties connect two individuals (a subject and object) with a predicate, while with data properties the predicate connects a single subject with some form of attribute data.
in RDF a statement is represented with S,P and O; In OWL the owl:ObjectProperty represents the predicate logic.
(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>
But how about to describe "the degree" I like dogs? How can I give a property or value to a predicate? One solution I got is to extend one (S,P,O) statement to 3 statements. For example,
(S) (P) (O)
Person isSrcOf LikeRelation
Pet isTargetOf LikeRelation
LikeRelation hasValue [0~100]
It should work but obviously it will let ontology 3 times bigger :(
I appreciate any suggestion!
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