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[protege-owl] how to query an owl ontology

anuj kumar anuj0416 at gmail.com
Tue May 20 16:17:50 PDT 2008


Martin thanks for the clarification.

On Tue, May 20, 2008 at 7:13 PM, Martin O'Connor <
martin.oconnor at stanford.edu> wrote:

> anuj kumar wrote:
>
> > SPARQL is used to query RDF , so does that mean OWL is first converted
> > to an RFD representation while implementing SPARQL queries with jena
> > and since RDF is not as rich as OWL we don't get good results using
> > SPARQL with OWL. Is my understanding correct?
>
> Yes. When applied to OWL, SPARQL is typically used to query the
> serialized RDF representation of an OWL ontology. This is problematic
> because this serialization can be extremely complex and is not
> deterministic.
>
> Martin
>
> >
> > Anuj
> >
> > On Tue, May 20, 2008 at 6:28 PM, Martin O'Connor
> > <martin.oconnor at stanford.edu <mailto:martin.oconnor at stanford.edu>>
> wrote:
> >
> >
> >     SPARQL is pretty poor at querying OWL because it has no
> >     understanding of
> >     its semantics. You could try SQWRL, which is based on OWL:
> >     http://protege.cim3.net/cgi-bin/wiki.pl?SQWRL
> >
> >     Martin
> >
> >     anuj kumar wrote:
> >
> >     > Hi,
> >     >
> >     > I have an owl ontology and my objective is to query the file
> >     based on
> >     > the parameters passed by a user. I am at the very beginning of this
> >     > implementation. I went through the tutorial of jena and sparql and
> I
> >     > have some very basic questions:-
> >     > Q1) Sparql is used to query RDF and not owl files correct? Then how
> >     > does jena query the owl files using sparql.
> >     > Q2) Which is the most widely used language to query owl files?
> >     >
> >     > Anuj
> >     >
> >
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