public void dispose() {
   try {
     reset();
   } catch (OWLException e) {
     logger.severe(e.getMessage());
   }
 }
  public void loadOntology() {
    try {
      /*
       * --apaitoymena vimata gia th dhmioyrgia mapped ontologias:
       * 1.dhmioyrgoyme ena toBeMappedIRI me skopo toy thn antistoixish me
       * to local File. 2.dhmioyrgoyme ena File me th dieythynsh ths
       * ontologias sto topiko apothikeytiko meso. 3.dhmioyrgoyme enan
       * SimpleIRIMapper kai ton prosthetoyme mesw toy manager. o
       * SimpleIRIMapper syndeei to toBeMappedIRI poy dwsame arxika, me
       * thn fysikh topothesia ths ontologias sto topiko apothikeytiko
       * meso. 4.dhmioyrgoyme ena ontologyIRI me akrivws thn idia arxiki
       * timh me to toBeMappedIRI to opoio tha einai to IRI ths ontologias
       * mas 5.dhmioyrgoyme thn ontologia mas xrhsimopoiwntas to
       * manager.loadOntology(ontologyIRI);
       */
      String sep = File.separator;

      manager = OWLManager.createOWLOntologyManager();
      toBeMappedIRI =
          IRI.create(
              "http://www.semanticweb.org/ontologies/ptyxiaki_v0.6/2011/5/Ontology1308067064597.owl");
      // ontFile = new File("../src/ontologyresources/ptyxiaki_v0.8.owl");
      ontFile = new File("src/ontologyresources/ptyxiaki_v0.8.owl");
      // in case of alternative location on load time when the application is jar'ed!
      if (!ontFile.canRead()) {
        ontFile = new File("ontologyresources/ptyxiaki_v0.8.owl");
      }
      manager.addIRIMapper(new SimpleIRIMapper(toBeMappedIRI, IRI.create(ontFile)));
      ontologyIRI =
          IRI.create(
              "http://www.semanticweb.org/ontologies/ptyxiaki_v0.6/2011/5/Ontology1308067064597.owl");
      topIxOnt = manager.loadOntology(ontologyIRI);
      OWLFactory = manager.getOWLDataFactory();
      topIxFormat = manager.getOntologyFormat(topIxOnt);
      topIxPrefixManager =
          new DefaultPrefixManager(topIxOnt.getOntologyID().getOntologyIRI().toString() + '#');

      System.out.println("loaded ontology: " + this.topIxOnt);
      System.out.println("from: " + this.manager.getOntologyDocumentIRI(this.topIxOnt));

    } catch (OWLException oex) {
      logger.info(oex.getMessage());
    }
  }