private void enableProtegeOntology() {
   if (!owlModel.isProtegeMetaOntologyImported()) {
     ImportHelper importHelper = new ImportHelper((JenaOWLModel) owlModel);
     try {
       URI uri = new URI(ProtegeNames.PROTEGE_OWL_ONTOLOGY);
       importHelper.addImport(uri);
       importHelper.importOntologies();
       owlModel
           .getNamespaceManager()
           .setPrefix(ProtegeNames.PROTEGE_OWL_NAMESPACE, ProtegeNames.PROTEGE_PREFIX);
       userDatatypesCBox.setEnabled(true);
     } catch (Exception e) {
       ProtegeUI.getModalDialogFactory().showErrorMessageDialog(owlModel, e.getMessage());
     }
   }
 }