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

Re: R: RDF query testcases?

From: Libby Miller <Libby.Miller@bristol.ac.uk>
Date: Fri, 17 Jan 2003 16:36:12 +0000 (GMT)
To: Andrea Chiodi <andrea.chiodi@bookinformatico.org>
cc: "'Libby Miller'" <Libby.Miller@bristol.ac.uk>, "'Jos De_Roo'" <jos.deroo@agfa.com>, www-rdf-rules <www-rdf-rules@w3.org>
Message-ID: <Pine.GSO.4.44.0301171628180.20462-100000@mail.ilrt.bris.ac.uk>


thanks Andrea, yes, that's the topic :)
I'm trying to find out how people manage their testcases for RDF query
languages with a view to collecting pointers to them (hopefully in
conjunctuion with Alberto Reggiori and Andy Seaborne's page of casecases
and examples:

http://rdfstore.sourceforge.net/2002/06/24/rdf-query/query-use-cases.html

Ideally, I'd like to come up with an (RDF maybe) format for describing
RDF query testcases. This might well include a way of descringing a
graph in RDF with an implicit questionmark at the end of it. Jos De Roo
does this (see earlier in the thread).

Have you got any urls or documents we could have a look at?

cheers

Libby

On Fri, 17 Jan 2003, Andrea Chiodi wrote:

> Hi. Apologies if I'm not catching the topic correctly (I've no time to read
> carefully all the newsgroup mails).
>
> I wrote some code in Jena to express a query as an RDF graph and to send it
> to remote query processor that executes it.
>
> Instead of "SELECT ?a,?b ... WHERE ... USING", I write a rdf:description of
> the query, saying
> "there is a query having a select with 2 variables, named a,b, this WHERE
> clause, etc ...".
> The receiving processor interprets the description of the query, composes a
> regular SELECT clause, and executes it.
> The answer also is returned as a rdf:description, saying:
> "this is the answer to such a query, it was composed this way, it consists
> in a result set with n results, with the given variables bound to these
> values, ....."
>
>
> Such a description helps me to realize some additional service, like:
> - add other parameters to the query, not allowed by the SELECT syntax
> - store the query for subsequent reuse
> - identify the query (with a URI) as an existing 'desire' of somebody
> - reason about the query (e.g. splitting it in subqueries)
>
> As a ?side? effect, the query itself now is a resource in the semantic web,
> so I could have another query looking for (a query looking for something). A
> good tool for sellers, isn't? :-)
>
>
> The experiment works pretty good, and I would like to compare it with other
> similar experiments.
>
> ? Is it in the topic of this thread? (again apologies if it isn't)
>
> ? There exist some running activity on this approach in represesenting
> queries ? Could you inform me about that ?
>
> Thanks
> ---------------------------------------
> Andrea Chiodi (andrea.chiodi@mail.inet.it)
>
>
>
> > -----Messaggio originale-----
> > Da: www-rdf-rules-request@w3.org
> > [mailto:www-rdf-rules-request@w3.org]Per conto di Libby Miller
> > Inviato: giovedi 16 gennaio 2003 18.06
> > A: Jos De_Roo
> > Cc: www-rdf-rules@w3.org
> > Oggetto: Re: RDF query testcases?
> >
> >
> >
> >
> > hi Jos!
> >
> > 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.
> >
> > 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). 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?
> >
> > 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.
> >
> > cheers,
> >
> > Libby
> >
> >
> >
> > On Thu, 16 Jan 2003, Jos De_Roo wrote:
> >
> > >
> > > Hi Libby!
> > >
> > > good question; it seems to us that a query is simply
> > > a set of triples where bnodes play the role of variables
> > > we then basically can apply a resolution process
> > >
> > > [[[
> > > The resolution process starts with a query. A query is a tripleset.
> > > The query will be matched against the triplesets of the initial
> > > graph G and against the rules. The set unifies with a rule when
> > > one of the triples of the set unifies with the consequent of the
> > > rule. The set unifies with another set if all triples in the set
> > > unify with a triple of the other set. This can possibly be done
> > > in different ways. The result of the unification of two triple
> > > sets is a list of substitutionlists.
> > > ]]]
> > >
> > http://www.agfa.com/w3c/2002/02/thesis/An_inference_engine_for
> > _RDF.html
> > > and this is work done by Guido Naudts in his master thesis
> > >
> > > we also have some running code at http://www.agfa.com/w3c/euler/
> > > and some testcases starting at http://www.agfa.com/w3c/euler/etc5
> > >
> > > but there's still a lot to do...
> > >
> > > -- ,
> > > Jos De Roo, AGFA http://www.agfa.com/w3c/jdroo/
> > >
> > >
> > >
> > >                     Libby Miller
> > >                     <Libby.Miller@bris       To:
> > www-rdf-rules@w3.org
> > >                     tol.ac.uk>               cc:
> > public-esw@w3.org
> > >                     Sent by:                 Subject:
> > RDF query testcases?
> > >                     www-rdf-rules-requ
> > >                     est@w3.org
> > >
> > >
> > >                     2003-01-16 12:40
> > >                     AM
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > Hi all
> > >
> > > We have some effort in SWAD-Europe [1] to write a document about RDF
> > > query [see [2]]. Part of this will be FAQ-based - a start
> > is here [3],
> > > (and I'd be grateful for any FAQs or answers).
> > >
> > > The main reason for sending this message it because I've
> > chatted to a
> > > few people who feel that a collection of RDF query
> > testcases would be a
> > > useful thing to have, and I can put some effort into this -
> > maybe as a
> > > minimum, finding out what's already available, and maybe
> > look into some
> > > ways of enabling one query language implementation to use another's
> > > testcases.
> > >
> > > So, would anyone out there like to share their test and their
> > > experiences of writing them? I can infer that Jena and 4suite have
> > > them; I think Mozilla has some too. I've got some here for Inkling:
> > >
> > > http://swordfish.rdfweb.org/rdfquery/tests/
> > > http://swordfish.rdfweb.org/rdfquery/rdf/
> > > http://swordfish.rdfweb.org/rdfquery/queries/
> > >
> > > Basically the test scripts read in
> > > http://swordfish.rdfweb.org/rdfquery/rdf/query-results-manifest.rdf
> > >
> > > which specifies the RDF/XML file to pull in, the query to
> > use and the
> > > expected number of rows in the resulting table. So it's only a very
> > > basic test of whether the query engine is functioning.
> > >
> > > Any more? Any thoughts?
> > >
> > > cheers,
> > >
> > > Libby
> > >
> > > [1] http://www.w3.org/2001/sw/Europe/
> > > [2]
> http://www.w3.org/2001/sw/Europe/plan/workpackages/live/esw-wp-7.html
> > [3] http://www.w3.org/2001/sw/Europe/reports/rdf_ql_comparison_report/
> >
> >
> >
> >
> >
> >
> >
> >
>
>
>
Received on Friday, 17 January 2003 11:37:36 GMT

This archive was generated by hypermail 2.2.0+W3C-0.50 : Monday, 7 December 2009 10:53:10 GMT