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RE: [TF-ENT] Querying datasets with default plus named graphs

From: Seaborne, Andy <andy.seaborne@hp.com>
Date: Wed, 7 Oct 2009 13:36:33 +0000
To: "Seaborne, Andy" <andy.seaborne@hp.com>, Birte Glimm <birte.glimm@comlab.ox.ac.uk>, SPARQL Working Group <public-rdf-dawg@w3.org>
Message-ID: <B6CF1054FDC8B845BF93A6645D19BEA3693EDB3300@GVW1118EXC.americas.hpqcorp.net>
> > We have a data set with the two named graphs http://example.org/a.rfd

> > and http://example.org/b.rdf (empty default graph).
> > http://example.org/a.rdf:

> >   :p rdfs:domain :A .
> > http://example.org/b.rdf:

> >   :x :p :y .

> > Just to check that I get this right: If we take the same datat set and
> > issue the query
> >   SELECT ?o WHERE { :x :p ?o . }
> > I would get no answer under simple entailment because the default
> > graph is empty.
> 
> Not quite - there is no dataset description so it will be whatever the
> processor provides as the dataset (i.e. it's set externally - common case).

Sorry - I now see you mean the processor provided dataset is the example above.

	Andy
Received on Wednesday, 7 October 2009 13:37:12 GMT

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