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Re: [TF-ENT] RDFS entailment regime proposal

From: Birte Glimm <birte.glimm@comlab.ox.ac.uk>
Date: Mon, 28 Sep 2009 17:32:08 +0100
Message-ID: <492f2b0b0909280932u646b05acvc2174965d1cbb966@mail.gmail.com>
To: Chimezie Ogbuji <ogbujic@ccf.org>
Cc: SPARQL Working Group <public-rdf-dawg@w3.org>
2009/9/26 Chimezie Ogbuji <ogbujic@ccf.org>:
> On 9/24/09 1:30 PM, "Birte Glimm" <birte.glimm@comlab.ox.ac.uk> wrote:

> But, how does
> ASK { rdf:_1 rdf:type rdf:property }
> provide an answer via the entailment regime if the possible solutions for a
> BGP under an entailment relationship is defined only WRT the variables in
> the query but there are none in this query?

Chime, I just realized what you mean and it is a very good point. I
now changed condition C1 to not talk about variables, but subjects in
P(BGP), which is actually what I intended. Thanks for pointing that
out. I also changed C1 to only consider the signature of the data, so
the above query would be answered with yes of rdf:_1 occurs somewhere
in your data and with no otherwise.
I think that gives a much nicer behavior and I couldn't see any
problems from that change.


> I like the 2nd option amongst the alternative design choices. It requires
> that if the user makes the mistake of giving a query that would normally
> give infinite answers (the use of patterns that match against axiomatic
> triples being one example), they must provide a restriction on the solution
> set.  Having no control over the returned answer seems reasonable given the
> 'unsafe' nature of the query.
> ----------------------
> Chime (chee-meh) Ogbuji (oh-bu-gee)
> Heart and Vascular Institute (Clinical Investigations)
> Architect / Informatician
> Cleveland Clinic (ogbujic@ccf.org)
> Ph.D. Student Case Western Reserve University
> (chimezie.thomas-ogbuji@case.edu)
> ===================================
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Dr. Birte Glimm, Room 306
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Received on Monday, 28 September 2009 16:32:44 UTC

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