The imported ontology is not publicly accessible, but it is on the specified URL on my corporate intranet. It is obviously imported since Teacher is in the list of classes. However, the relationship between Teacher and Person isn't.
The issue has nothing to do with the OntDocumentManager, since the testbase.owl isn't a local file. The issue is easy enough to duplicate though. -----Original Message----- From: Dave Reynolds [mailto:[email protected]] Sent: Tuesday, August 13, 2013 11:04 AM To: [email protected] Subject: Re: Imports and properties? On 13/08/13 15:41, Ed Swing wrote: > Apparently, properties are not imported when an ontology is imported - not > even the subclass relationship. To test this, I have created two simple > ontologies. First, the base (imported) ontology: > > <!DOCTYPE rdf:RDF [ > <!ENTITY xsd "http://www.w3.org/2001/XMLSchema#"; > > <!ENTITY owl "http://www.w3.org/2002/07/owl#"; > > <!ENTITY rdf "http://www.w3.org/1999/02/22-rdf-syntax-ns#"; > ]> > > > <rdf:RDF xmlns="http://luminary.unx.sas.com/test#"; > xml:base="http://luminary.unx.sas.com/test#"; > xmlns:owl="http://www.w3.org/2002/07/owl#"; > xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"; > xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"; > xmlns:xsd="http://www.w3.org/2001/XMLSchema#";> > > <owl:Ontology rdf:about="TestBase"> > <rdfs:comment>Test Base Ontology</rdfs:comment> > <rdfs:label>Test Base Ontology</rdfs:label> > </owl:Ontology> > > <owl:Class rdf:ID="Person" /> > <owl:Class rdf:ID="Teacher"> > <rdfs:subClassOf rdf:resource="#Person" /> > </owl:Class> > </rdf:RDF> > > Next, the importing ontology: > > <!DOCTYPE rdf:RDF [ > <!ENTITY xsd "http://www.w3.org/2001/XMLSchema#"; > > <!ENTITY owl "http://www.w3.org/2002/07/owl#"; > > <!ENTITY rdf "http://www.w3.org/1999/02/22-rdf-syntax-ns#"; > > <!ENTITY tst "http://luminary.unx.sas.com/test#"; > > ]> > > > <rdf:RDF xmlns="http://luminary.unx.sas.com/import#"; > xml:base="http://luminary.unx.sas.com/import#"; > xmlns:owl="http://www.w3.org/2002/07/owl#"; > xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"; > xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"; > xmlns:xsd="http://www.w3.org/2001/XMLSchema#"; > xmlns:tst="http://luminary.unx.sas.com/test#";> > > <owl:Ontology rdf:about="TestImport"> > <rdfs:comment>Test Import Ontology</rdfs:comment> > <rdfs:label>Test Import Ontology</rdfs:label> > <owl:imports > rdf:resource="http://luminary.unx.sas.com/luminary/testbase.owl"/> > </owl:Ontology> > > <owl:Class rdf:ID="Administrator"> > <rdfs:subClassOf rdf:resource="&tst;Person" /> > </owl:Class> > </rdf:RDF> > > Finally, here is the Java class I wrote to test this: > > import java.io.FileInputStream; > import java.io.IOException; > import java.util.Iterator; > import com.hp.hpl.jena.ontology.OntClass; > import com.hp.hpl.jena.ontology.OntModel; > import com.hp.hpl.jena.ontology.OntModelSpec; > import com.hp.hpl.jena.rdf.model.*; > import com.hp.hpl.jena.vocabulary.RDFS; > > public class SubclassTest { > > public static void main(String[] args) throws IOException { > OntModel model = > > ModelFactory.createOntologyModel(OntModelSpec.OWL_DL_MEM_RULE_INF); > FileInputStream inStream = > new FileInputStream("resources/testimport.owl"); > model.read(inStream, null); > inStream.close(); > for (Iterator<OntClass> clsIter = model.listClasses(); clsIter > .hasNext();) { > OntClass cls = clsIter.next(); > System.out.println("CLS: " + cls.getURI()); > for (StmtIterator stIter = > model.getBaseModel().listStatements(cls, RDFS.subClassOf, > (RDFNode) null); stIter.hasNext();) { > Statement stmt = stIter.next(); > RDFNode obj = stmt.getObject(); > if (obj.isURIResource()) { > OntClass par = model.getOntClass(obj.toString()); > System.out.println(" Parent: " + par.getURI()); > } > } > } > } > } > > The output from the class shows the following (I've trimmed the > www.w3.org<http://www.w3.org> classes from this for brevity): [Aside: for testing import processing it would be simpler to work without inference so you can see the wood for the trees.] > CLS: http://luminary.unx.sas.com/import#Administrator > Parent: http://luminary.unx.sas.com/test#Person > CLS: http://luminary.unx.sas.com/test#Teacher > CLS: http://luminary.unx.sas.com/test#Person > > Clearly, the Teacher is a subclass of Person, as it is defined in the base > ontology. However, this relationship does not appear. When an ontology is > imported, it is supposed to import all definitions and statements. However, > this is clearly not the case. How are you expecting the imported document to be located? The import URL is given as: http://luminary.unx.sas.com/luminary/testbase.owl but that URL gives a 404 for me. To map a URL onto a local file you need either an ont-policy.rdf file or need to programatically configure an OntDocumentManager, as described in: http://jena.apache.org/documentation/ontology/ Your code doesn't include any OntDocumentManager set up so presumably you are relying on an ont-policy document, in which case the problem may be in the mapping file itself or the file might not be being found in your execution environment. Dave
