I accidentally failed to send this to the list: "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. > Using "predications linking them to suitable subject-indicating URIs" > sounds cumbersome. Using actual resources provides this functionality in > a more uniform way. Sure, it's convenient to identify Shakespeare with his picture. Unfortunately it leads to nonsensical conclusions like "An English playwright has a height of 160 pixels." (end of original) Manos then replied (copied here by permission): > Ah, I see what your intended use of anonymous nodes originated from. The > situation you describe is a (quite common) human error in understanding > and applying the semantics of RDF. Your use-case is also a good place to > distinguish between retreivable and non-retreivable resources. This is exactly isomorphic to the TM distinction between resource references and subject-indicating references. > 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. -- Evolutionary psychology is the theory John Cowan that men are nothing but horn-dogs, http://www.ccil.org/~cowan and that women only want them for their money. http://www.reutershealth.com --Susan McCarthy (adapted) jcowan@r...
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