W3C home > Mailing lists > Public > public-rdf-dawg@w3.org > July to September 2009

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:
[snip]

> 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.

Birte

> 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)
>
>
> ===================================
>
> P Please consider the environment before printing this e-mail
>
> Cleveland Clinic is ranked one of the top hospitals
> in America by U.S. News & World Report (2008).
> Visit us online at http://www.clevelandclinic.org for
> a complete listing of our services, staff and
> locations.
>
>
> Confidentiality Note:  This message is intended for use
> only by the individual or entity to which it is addressed
> and may contain information that is privileged,
> confidential, and exempt from disclosure under applicable
> law.  If the reader of this message is not the intended
> recipient or the employee or agent responsible for
> delivering the message to the intended recipient, you are
> hereby notified that any dissemination, distribution or
> copying of this communication is strictly prohibited.  If
> you have received this communication in error,  please
> contact the sender immediately and destroy the material in
> its entirety, whether electronic or hard copy.  Thank you.
>
>



-- 
Dr. Birte Glimm, Room 306
Computing Laboratory
Parks Road
Oxford
OX1 3QD
United Kingdom
+44 (0)1865 283529
Received on Monday, 28 September 2009 16:32:44 GMT

This archive was generated by hypermail 2.2.0+W3C-0.50 : Thursday, 26 April 2012 12:08:28 GMT