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RE: Objective 4.6 -- additional semantic information

From: Dan Connolly <connolly@w3.org>
Date: Tue, 08 Jun 2004 17:48:23 -0500
To: Rob Shearer <Rob.Shearer@networkinference.com>
Cc: Kendall Clark <kendall@monkeyfist.com>, Jim Hendler <hendler@cs.umd.edu>, RDF Data Access Working Group <public-rdf-dawg@w3.org>
Message-Id: <1086734903.21030.593.camel@dirk>

On Tue, 2004-06-08 at 17:39, Rob Shearer wrote:
> > "The protocol should allow construction of notional RDF
> > graphs inferred (e.g. using standardized semantics such
> > as RDFS, OWL or emerging technologies such as SWRL or N3
> > rules) so that queries may be posed against the inferred
> > knowledge base."
> 
> I have a problem with that because it seems to imply that all knowlege
> *about* an RDF graph can be encoded *within* an RDF graph, and that's
> clearly not the case. (The charter similar slants things this way as
> well, which I think is a mistake.)

Well, this is a limited way of layering query on inference, but
the limitation is intentional in the charter, I believe.

If lots of WG members want the charter changed, I can look into that.

>  It's perfectly sensible to know, for
> example, that an RDF graph must contain at least one of two possible
> triples, but not which one. Are you allowed to use that information to
> help answer queries about the graph? I think it would be a major mistake
> to make the use of such information a violation of the spec.
-- 
Dan Connolly, W3C http://www.w3.org/People/Connolly/
Received on Tuesday, 8 June 2004 18:47:58 GMT

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