W3C home > Mailing lists > Public > www-rdf-rules@w3.org > January 2003

Re: RDF query testcases?

From: Jos De_Roo <jos.deroo@agfa.com>
Date: Thu, 16 Jan 2003 18:55:42 +0100
To: "Libby Miller <Libby.Miller" <Libby.Miller@bristol.ac.uk>
Cc: "Jos De_Roo" <jos.deroo@agfa.com>, www-rdf-rules@w3.org
Message-ID: <OF8D30381E.210326B9-ONC1256CB0.005FC70B-C1256CB0.006283AA@agfa.be>

> So, looking at
> http://www.agfa.com/w3c/euler/
> and particularly the questions like
> http://www.agfa.com/w3c/euler/gedcom-query.n3
> you're using n3 to describe an RDF graph and _interpreting_
> the graph as a query, is that right? like Pat Hayes said I think - an
> RDF graph with a question-mark at the end? So the graph means something
> different - a question, rather than a set of statements.

right, exactly you that right, Pat explained very clearly

> I like this approach very much for testing especially (though I'd use
> N-triple rather than N3, there's not a big difference for something
> like this I don't think).

well I guess you meant ntriples with qnames as is
currently provided in Jena 1.6 output, but indeed
there's not a big difference

>                           The only issue I can see is that queries
> (although rarely in my experience) could have blank predicates, anbd
> predicates can't be bnodes in RDF as far as I know. Do you think this
> matters?

well I can only speak based on my experience with
the 227 testcases that we currently have spawned
from http://www.agfa.com/w3c/euler/etc5 and in
there we haven't needed it, but you're right, we
have to think about that...

> For the results, cleverer backends might produce more results in for
> the same query, and we'd have to take this into account for describing
> the results.

I see
actually we have that either a single result
(in the form of a proof or an explanation)
is returned or all answers with the --think
command line argument
not very human readable, just to get an idea
see http://www.agfa.com/w3c/euler/etc5-proof.n3
where you could pay no attention to indented stuff

-- ,
Jos De Roo, AGFA http://www.agfa.com/w3c/jdroo/
Received on Thursday, 16 January 2003 12:56:22 UTC

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