ece 720 intelligent web: ontology and beyond

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ece 720 intelligent web: ontology and beyond lecture 4a: rdf – addendum

RDF URI and URIref URI identifies a resource in the Web URIref is URI Reference, it is a URI with an optional fragment identifier ece 720, winter ‘12

RDF URI and URIref fragment identifier is a string that refers to a resource “within” another primary resource identified by URI is attached to URI and preceded by the character # ece 720, winter ‘12

RDF URIref absolute http://www.w3.org/People/EM/contact#me http://www.w3.org/2000/10/swap/pim/contact#Person http://www.w3.org/2000/10/swap/pim/contact#mailbox http://www.example.org/staffem/85431 relative #PrivateDoc equivalent to http://www.ualberta.ca/schema#PrivateDoc ece 720, winter ‘12

RDF rdf:type is a property that provides an elementary typing system in RDF there is a triple: R rdf:type C ece 720, winter ‘12

RDF rdf:type R rdf:type C states that C is an instance of rdfs:Class and R is an instance of C. the rdfs:domain of rdf:type is rdfs:Resource the rdfs:range of rdf:type is rdfs:Class ece 720, winter ‘12

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