> Consider the address bnode example in the RDF Primer > (http://www.w3.org/TR/2004/REC-rdf-primer-20040210/#structuredproperties). > There may be times when you want to reference that address externally > (e.g. from another model) but the common sense approach to enable that > by just replacing the bNode with a URI reference has a couple of problems: > * it changes the meaning of the model: bNodes serve as existential > variables -- if you replace two distinct bNodes x and y with 2 different > URIs you are adding information to the model: because there is nothing > in the model that says x and y might not be equal but the two URIs that > replace are indeed not equal (since RDF uses intensional semantics for > URIs). Not true. I think you're saying <a> <b> <c>. <d> <e> <f>. entails <a> owl:differentFrom <d>. ... but I really don't think that's the case. Can you find some supporting text? (My recommendation: bNodes are a real pain to reason about, so avoid them unless doing so is an even bigger pain.) -- sandroReceived on Thursday, 11 March 2004 21:49:00 UTC
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