David Allsopp wrote: > Perhaps the solution is to 'flatten' an RDF model containing reified > statements (applying filters according to the origin of the statements > or other criteria) to generate a model without any reifications, which > can be queried easily. This could be done explicitly, or we could have > a Virtual Model which acts as a filtered interface to one or more actual > models? Yes I think you are on to something here. Whatever RDF is, I think it is safe to say, it is an external language, it is not very useful as your internal knowledge representation. So that to simplify the query I would use a quadruple internally instead of the external triple ... principally as Graham has suggested ... and place all statements made by someone in some context: [Context:Things Said About John] | [Context:Sam says about John]----contains--->[id1, John, age,42] [Context:Tom says about John]----contains--->[id2, John, age,43] [Context:John says about John]----contains--->[id3, John, age,39] So if the context node [Context:Things Said About John] is selected, then all the triples id1, id2, id3 show up otherwise they do not; so your simplified query would be something like: select [Context:Things Said About John] select [*, John, age, ?] The world is context sensitive, so things just work better in context :)) Seth RussellReceived on Wednesday, 13 December 2000 12:53:16 UTC
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