For some reason, the classes that I define in an ontology are not being stored in TDB. Here's the test class:
package tdb; import java.util.Iterator; import com.hp.hpl.jena.ontology.*; import com.hp.hpl.jena.query.Dataset; import com.hp.hpl.jena.query.ReadWrite; import com.hp.hpl.jena.rdf.model.*; import com.hp.hpl.jena.tdb.TDBFactory; /** * @author <a href="http://www.ganae.com/edswing";>Edward Swing</a> */ public class OntTest { protected static String BASE_URI = "http://foo.bar/";; protected static String USER_CLASS = BASE_URI + "User"; protected static String PROJECT_CLASS = BASE_URI + "Project"; // object property linking project to who checked it out protected static String CAN_READ_PROP = BASE_URI + "canRead"; // object property linking user to a project he can read protected static String CAN_EDIT_PROP = BASE_URI + "canEdit"; public void createRepository() { OntModel model = ModelFactory.createOntologyModel(); OntClass userCls = model.createClass(USER_CLASS); OntClass projCls = model.createClass(PROJECT_CLASS); // TODO: define a Concept as a union between Class, Thing, and // Property RDFList clsList = model.createList(new RDFNode[] { userCls, projCls }); model.createAllDifferent(clsList); // now add properties ObjectProperty canRead = model.createObjectProperty(CAN_READ_PROP); ObjectProperty canEdit = model.createObjectProperty(CAN_EDIT_PROP); canRead.setDomain(userCls); canEdit.setDomain(userCls); canRead.setRange(projCls); canEdit.setRange(projCls); // now write the model into the store Dataset dataset = TDBFactory.createDataset("tdb/data"); dataset.begin(ReadWrite.WRITE); Model meta = dataset.getNamedModel("metadata"); meta.setNsPrefix("", BASE_URI); meta.add(model); dataset.commit(); dataset.end(); } public void listOntClasses() { Dataset dataset = TDBFactory.createDataset("tdb/data"); dataset.begin(ReadWrite.READ); Model model = dataset.getNamedModel("metadata"); System.out.println("ModelURI:" + model.getNsPrefixURI("")); OntModel ontModel = ModelFactory.createOntologyModel(OntModelSpec.OWL_DL_MEM_RULE_INF); // copy the model into the in-memory ontology model ontModel.add(model); ontModel.setNsPrefixes(model); dataset.end(); System.out.println("OntModel:" + ontModel.getNsPrefixURI("")); for (Iterator<OntClass> clsIter = ontModel.listClasses(); clsIter .hasNext();) { OntClass cls = clsIter.next(); System.out.println("CLS: " + cls.getLocalName()); } } public static void main(String[] args) { OntTest nsTest = new OntTest(); nsTest.createRepository(); nsTest.listOntClasses(); } The results of the print do not contain the User or Project classes. Any help would be appreciated. Edward Swing Applied Research Technologist Vision Systems + Technology, Inc., a SAS Company 6021 University Boulevard * Suite 360 * Ellicott City * Maryland * 21043 Tel: 410.418.5555 Ext: 919 * Fax: 410.418.8580 Email: [email protected]<mailto:[email protected]> Web: http://www.vsticorp.com<http://www.vsticorp.com/>
