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[protege-owl] how to query an owl ontology

Martin O'Connor martin.oconnor at stanford.edu
Tue May 20 16:13:27 PDT 2008


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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