problem with Descriptions?

Tue, 27 Aug 2013 14:29:00 -0700 

hey jena folks,

I'm new to this list, so please forgive me if I get something wrong...
my specific questions are at the end of this email, but I wanted to first describe my problem: 


*I am trying to read the latest AIRS OWL (rdf/xml) files, and I'm having 
a problem with a particular construct. **

**In AIRSMidLevelOntology.owl, on line 484, I have this:*

<owl:Class rdf:ID="LandlineTelephoneNumber">
    <rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string";
    >Landline telephone number</rdfs:label>
    <owl:equivalentClass>
      <owl:Restriction>

        <owl:onProperty 
rdf:resource="http://www.cubrc.org/ontologies/KDD/Mid/InformationEntityOntology#designates"/> 


        <owl:someValuesFrom>
          <owl:Class>
            <owl:intersectionOf rdf:parseType="Collection">

              <rdf:Description 
rdf:about="http://www.cubrc.org/ontologies/KDD/Mid/ArtifactOntology#LandlineTelephone"/> 


              <owl:Restriction>

                <owl:onProperty 
rdf:resource="http://www.obofoundry.org/ro/ro.owl#part_of"/>
                <owl:someValuesFrom 
rdf:resource="http://www.cubrc.org/ontologies/KDD/Mid/ArtifactOntology#TelecommunicationNetwork"/> 


              </owl:Restriction>
            </owl:intersectionOf>
          </owl:Class>
        </owl:someValuesFrom>
      </owl:Restriction>
    </owl:equivalentClass>
    <rdfs:subClassOf>
      <owl:Class rdf:ID="TelephoneNumber"/>
    </rdfs:subClassOf>
  </owl:Class>
*
**but jena throws when i read **this line:*

<rdf:Description 
rdf:about="http://www.cubrc.org/ontologies/KDD/Mid/ArtifactOntology#LandlineTelephone"/>


*saying that it can't convert it to a class:*

Uncaught throwable handled

com.hp.hpl.jena.ontology.ConversionException: Cannot convert node 
http://www.cubrc.org/ontologies/KDD/Mid/ArtifactOntology#LandlineTelephone 
to OntClass: it does not have rdf:type owl:Class or equivalent
    at 
com.hp.hpl.jena.ontology.impl.OntClassImpl$1.wrap(OntClassImpl.java:83)

    at com.hp.hpl.jena.enhanced.EnhNode.convertTo(EnhNode.java:152)
    at com.hp.hpl.jena.enhanced.EnhNode.convertTo(EnhNode.java:31)
    at com.hp.hpl.jena.enhanced.Polymorphic.asInternal(Polymorphic.java:62)
    at com.hp.hpl.jena.enhanced.EnhNode.as(EnhNode.java:107)

    at 
com.hp.hpl.jena.ontology.impl.OntResourceImpl$AsMapper.map1(OntResourceImpl.java:1657)

    ...



if I change "rdf:Description" to "owl:class" then it works properly, but 
I don't think it's doing what I want (in that I don't think it actually 
references the external class).




I think it has to do with accessing classes and properties from owl 
files elsewhere on the web (note that the rdf:Description is referencing 
a class in another file)


in particular, there is a uri that gives a 404 when being referenced.

It works properly when I am accessing only local classes.

I am using this code to load my file:


final OntModel jenaModel = ModelFactory.createOntologyModel( 
OntModelSpec.OWL_MEM);

        try {
            jenaModel.read(
                    new FileReader(owlDocument),
                    null
            );



so my questions are:   (and please forgive the naiveté of them, I'm 
super new to this!)



(1) does jena automatically download the files referenced throughout the 
file?



(2) if I need to add a local file for it to reference, is there a way of 
loading the main file and the one it references together in a

single read?

thanks in advance!

-thomas marsh































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