- From: Steve Harris <S.W.Harris@ecs.soton.ac.uk>
- Date: Tue, 5 Aug 2003 22:53:27 +0100
- To: www-rdf-interest@w3.org
Hi, I've been running the RDF conformance tests against the current version of 3store and I have some observations: According to http://www.w3.org/2000/10/rdf-tests/rdfcore/rdfms-seq-representation/Manifest.rdf#test002 the empty document should entail: <rdf:_1> <rdf:type> <rdfs:ContainerMembershipProperty> . But Section 4.2/2 of the RDF Semantics document (http://www.w3.org/TR/rdf-mt/) says: "Add all triples of the following forms [rdf:_* rdf:type CMP]. This is an infinite set because the RDF container vocabulary is infinite. However, since none of these triples entail any of the others, it is only necessary, in practice, to add the triples which use those container properties which actually occur in any particular graph or set of graphs in order to check the rdfs-entailment relation between those graphs." The MT document's description seems more sensible to me as otherwise there is no way to finitly resolve the query (?foo, <rdf:type>, <rdfs:ContainerMembershipProperty) I'm also concerned that its not possible to efficiently implement the new Literal and Datatype entailments, and they do not seem to be optional. Adding them would add another few million triples to our production KB and seems to produce confusing entailments. What is the intended meaning if you add <foo> <bar> "10" which (I think) entails <foo> <bar> _:something (by _:something <rdf:type> <rdfs:Literal> rdfD 1) It seems to just produce unhelpful results if you query for (<foo>, <bar>, ?o) What is the scope of _:something, I gather its supposed to be the same ID for all literals that are byte-for-byte identical and have the same datatype, but what happens when you merge graphs with different nodes for _:something? How do you associate a given literal with the corresponging bNode? Is it incorect for two identical literals to have different bNodes, or identical bNodes to have different literals and if so, how do you avoid this? - Steve -- Stephen Harris 07970 557047 AKT, IAM Research Group 023 8059 2831 University of Southampton, UK swh@ecs.soton.ac.uk http://www.aktors.org/
Received on Tuesday, 5 August 2003 17:53:30 UTC