John Cowan wrote: > > "Emmanuil Batsis (Manos)" scripsit: > > > The usability of anonymous nodes can be overrated as they don't have a > > URI serving as a global unique identifier (and potentialy locator) for > > them. > > Indeed. One would have to impose a higher-order rule that says "two b-nodes > with identical subjectIndicator properties are to be treated as identical", > as indeed they do in the TM world. Yes, actually this is where owl:FunctionalProperty and owl:InverseFunctionalProperty come in. http://www.w3.org/TR/owl-ref/#FunctionalProperty-def In the above the property "subjectIndicator" would be defined as <owl:FunctionalProperty rdf:ID="subjectIndicator" /> and hence if you had the following: #a :subjectIndicator #foo . #b :subjectIndicator #foo . you could conclude that: #a owl:sameIndividualAs #b [...] > > > The right thing to do would be to use a non-retreivable scheme URI > > (perhaps a URN?) (or an rdf:ID) to denote Shakespeare, as one cannot > > simply download him. His picture should be mentioned as just that, not > > as the person itself. Anonymous nodes are not needed to avoid confusion: > > > > <rdf:Description rdf:about="nonRetreivable://Persona/Shakespeare"> > > <foo:picture rdf:resource="http://URL/to/pic"/> > > </rdf:Description> > > The rdf:ID to which you refer is the b-node/anonymous node I was talking > about in the first place. for example: <owl:FunctionalProperty rdf:ID="ssn" > <rdfs:domain rdf:resource="#Person" /> </owl:FunctionalProperty> then the following: <Person> <ssn rdf:resource="#000-11-1234" /> <haircolor rdf:resource="#blond" /> </Person> and somewhere else: <Person> <ssn rdf:resource="#000-11-1234" /> <nosering rdf:resource="#large"/> </Person> you could conclude that these two (anonymous) persons are the same individual. If you think about it, this is a totally powerful facility -- and rather useful. Jonathan
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