SPARQL query to query an ontology using JENA

Question

Hello,
I'm trying to query my OWL ontology.
This is an example of my ontology:
    <owl:Class rdf:about="#escherichia_coli">
        <owl:equivalentClass>
            <owl:Restriction>
                <owl:onProperty rdf:resource="#has_genus"/>
                <owl:someValuesFrom rdf:resource="#escherichia_genus"/>
            </owl:Restriction>
        </owl:equivalentClass>
        <rdfs:subClassOf rdf:resource="#named_bacteria"/>
        <rdfs:subClassOf>
            <owl:Restriction>
                <owl:onProperty rdf:resource="#has_respiratory_mode"/>
                <owl:someValuesFrom rdf:resource="#Aerobes"/>
            </owl:Restriction>
        </rdfs:subClassOf>
        <rdfs:subClassOf>
            <owl:Restriction>
                <owl:onProperty rdf:resource="#hasGramStaining"/>
                <owl:someValuesFrom rdf:resource="#gram_staining_negative"/>
            </owl:Restriction>
        </rdfs:subClassOf>
        <rdfs:subClassOf>
            <owl:Restriction>
                <owl:onProperty rdf:resource="#has_morphology"/>
                <owl:someValuesFrom rdf:resource="#rod"/>
            </owl:Restriction>
        </rdfs:subClassOf>
    </owl:Class>I would like to retrieve all bacterium caracteristics (morphology, gram_staning, respiratory_mode).
Whith this query, i can show the bacteria list.
PREFIX rdfs:     <http://www.w3.org/2000/01/rdf-schema#>
PREFIX :            <http://www.ontology.com/bacteria.owl#>
PREFIX owl:      <http://www.w3.org/2002/07/owl#>
SELECT DISTINCT *
WHERE {
     ?bacteria rdfs:subClassOf :named_bacteria.
     FILTER (isIRI(?bacteria) && !sameTerm(?bacteria, owl:Nothing))
ORDER BY (?bacteria)With this query, i tried to have all caracteristics, but it doesn't work (i also used the UNION clause, but it doesn't work to):
SELECT DISTINCT ?bacteria ?genus
WHERE  {
       ?bacteria rdfs:subClassOf :named_bacteria;
                 :has_genus ?genus.
     ?genus    rdfs:subClassOf :genus;
     FILTER (isIRI(?bacteria) && !sameTerm(?bacteria, owl:Nothing))
} ORDER BY (?bacteria)My second question is how to use query 2 graph with JENA? I've a .java file in wich i used some JENA properties to query an OWL file (i open my owl file and my .rq file with the SPARQL query in my .java File). But i need to query also a .n3 File, is it possible to do this only in my SPARQL query?
Please, i really need your help!
Kind regards

Answer 1

One thing to clarify, are you using just Jena or are you using Jena + Jena Adaptor + Oracle database?
Thanks,
Zhe Wu