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Re: Queries over multiple graphs

From: Pat Hayes <phayes@ihmc.us>
Date: Tue, 28 Sep 2004 09:40:35 -0500
Message-Id: <p06001f11bd7f27c6db37@[]>
To: Steve Harris <S.W.Harris@ecs.soton.ac.uk>
Cc: RDF Data Access Working Group <public-rdf-dawg@w3.org>

>On Tue, Sep 28, 2004 at 11:47:05AM +0100, Steve Harris wrote:
>>  In recent discussions over email and on IRC this morning we hit a
>>  difference of implementation in some RDF storage systems.
>>  In my system if you load multiple graphs with distinct source information
>>  and the same statement appears in 2 graphs there are two distinct
>>  statements. The same goes for statements that may be inferred by multiple
>>  routes.
>Discussing this further it appears to be a philosophical difference: does
>an RDF store hold a single (merged) RDF graph with statements from
>different sources, or does it hold a set of RDF graphs.

Surely the right answer is, yes. That is, it could be either. Its up 
to the owner responsible for maintaining the store to decide. So the 
QL ought to be able to handle both cases, which I think is the case 
right now.


>- Steve

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Received on Tuesday, 28 September 2004 14:41:55 UTC

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