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Jena: Listing All Classes And Instances In A Jena Ontology Model

08.06.2007
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        // Listing all classes and instances in a Jena ontology model

    OntModel model = ModelFactory.createOntologyModel();
    model.read(ONT_URL);
    
    ExtendedIterator classes = model.listClasses();

    while (classes.hasNext())
    {
      OntClass thisClass = (OntClass) classes.next();
      _logger.info("Found class: " + thisClass.toString());

      ExtendedIterator instances = thisClass.listInstances();

      while (instances.hasNext())
      {
        Individual thisInstance = (Individual) instances.next();
        _logger.info("  Found instance: " + thisInstance.toString());
      }
    }