public static boolean doesClassExist(Element element, OntologyToolset bundle) {
   String className =
       StringManipulation.makeURICompliantFragment(
           element.getIdentification(), bundle.getBaseIRI());
   String classIRI = bundle.getIRI(className);
   return classes.get(classIRI) != null;
 }
  public static OWLClass getOWLClass(Element element, OntologyToolset bundle, String postfix) {
    String className =
        StringManipulation.makeURICompliantFragment(
            element.getIdentification(), bundle.getBaseIRI());
    String classIRI = bundle.getIRI(className);

    if (postfix != null) classIRI += "_" + postfix;

    return getClass(classIRI, bundle);
  }
  private static OWLClass getClass(String uri, OntologyToolset bundle) {
    OWLClass owlClass = classes.get(uri);

    if (owlClass == null) {
      owlClass = bundle.getDataFactory().getOWLClass(IRI.create(uri));
      classes.put(uri, owlClass);
    }
    return owlClass;
  }