Hello,
The KB is not empty,I can perform query and get response propertly, the
problem only involves labels. The problem seems to appear only in the
integration with Pellet. I used the version provided by
<dependency>
<groupId>net.sourceforge.owlapi</groupId>
<artifactId>pellet-profiler-ignazio1977</artifactId>
<version>2.4.0-ignazio1977</version>
</dependency>
Cheers.
Il 25/09/2015 18:19, Dave Reynolds ha scritto:
> On 25/09/15 10:34, df.santamaria87 wrote:
> > Dear all,
> >
> > I have a problem querying labels in Jena with Pellet reasoner.
> > The ontologies I'm using were populated with OWL-API and Pellet. Now I
> > would ask for some labels. So I write:
> >
> > KnowledgeBase kb = reasoner.getKB();
> > PelletInfGraph graph = new
> > org.mindswap.pellet.jena.PelletReasoner().bind( kb );
> >
> > InfModel model = ModelFactory.createInfModel( graph );
> > Query q = QueryFactory.create(query);
> > QueryExecution qe = QueryExecutionFactory.create( q, model );
> > ResultSet rs = qe.execSelect();
> >
> > The query simple asks for labels:
> >
> > PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
> > SELECT ?subject ?object
> > WHERE { ?subject rdfs:label ?object }
> >
> > I get no result. I tried the query in Protegè with the same ontologies
> > and it works properly. Other queries work, the problem is limited to
> > labels . So, what I'm missing in the code ?
>
> I'm not familiar with the Pellet API but don't see where you are loading
> the data. Does kb have anything in it? If you do kb.find(Node.ANY,
> Node.ANY, Node.Any) and iterate over the first few triples is there
> anything there?
>
> If you load the same ontology into a plain model and run the query does
> it work?
>
> If so then it sounds like a question for the Pellet folks.
>
> If you are using jena 3 then there may be incompatibilities with Pellet
> due to the RDF 1.1 changes to how strings are handled.
>
> Dave
>
>
