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[protege-owl] Sparql and subclasses

Marisa Santos Amaro marisa.osantos at gmail.com
Sun Apr 1 17:03:28 PDT 2007


Thanks for your suggestion, Chema !!
The "Queries" tab of Protege returns all the instances (the inferred, too),
but Sparql actually doesn´t do it. I´ll  try Jena code and check the
results.

Best regards !!
Marisa.


On 4/1/07, Chema . <chema.ar at gmail.com> wrote:
>
> Hi Marisa,
>
> Probably, sparql engine in protege works with the open model of the
> ontologies (only classes and instances declared by the user, not inferred by
> the reasoner), therefore the query do not retrieve the expected result.
>
> A simple solution could be ask, explicitily, for the instances in the
> query, something as:
>
> 1-Obtain all classes we want to retrieve their instances.
> 2-Union with these classes to  look up their instances
> 3-It is a bad solution, not scale and the union operation in sparql has a
> high cost
>
> select ?in
> where
> {
> { {?cl   rdfs:subClassOf    :B0 } union {?cl rdfs:subClassOf  :B1}  union
> {?cl rdfs:subClassOf  :Bi}}.
> ?in rdf:type ?cl
> }
>
>
> Another solution ant the good way is close the model, after we can run the
> query over declared and inferred classes/instances.
> I don't know how to close the model in protege, i usually use a simple
> program created with Java, Jena and Arq to run  this kind of queries.
>
> Bye, Chema
>
>  On 4/1/07, Marisa Santos Amaro <marisa.osantos at gmail.com> wrote:
>
> >  Hi, dear friends from OWL list !!
> >
> > I have some doubts about SPARQL and RACER running to query a Protege
> > ontology.
> > 1) SPARQL
> > In the ontology below, SPARQL shows me only asserted instances of first
> > level classes (like I3)and instances of subclasses located  at the second
> > level of hierarchical model,  like I1 and  I2.
> > - Class A
> >     > Class A1
> >     > Class A2  >> I1
> > - Class B >>  I3
> >     > Class B1
> >     > Class B2 >> I2
> >         > Class B21    >> I4
> >                               >> I5
> > I´d like to get all instances of Class B and of its subclasses, in all
> > levels down, but the following query returns just I2 and I3. The instances
> > I4 and I5 of Class B21 (a second level subclass) are not selected.
> >   SELECT   ?z
> >   WHERE  {?x    rdfs:subClasOf    :ClassB  .
> >                  {?z    a   ?x}    UNION
> >                  {?z    a   :ClassB}  }
> > 2) RACER
> > Running this reasoner, why it do not put asserted instances of ClassB21
> > as inferred ones of classes ClassB1 and ClassB ?
> >
> > Thanks for any help.
> >
> > Marisa.
> >
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-- 
      Marisa de Oliveira Santos Amaro
             Capitão-de-Fragata ( T )
     Superintendente de Infra-estrutura e
   Serviços de Tecnologia da Informação
Diretoria de Finanças da Marinha - DFM
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