private OWLClassExpression parseClassExpression(String expression) {
        OWLDataFactory dataFactory = this.getOntology().getOWLOntologyManager().getOWLDataFactory();
        ManchesterOWLSyntaxEditorParser parser = new ManchesterOWLSyntaxEditorParser(dataFactory, expression);
        parser.setDefaultOntology(this.getOntology());
        OWLEntityChecker entityChecker = new ShortFormEntityChecker(bidiShortFormProvider);
        parser.setOWLEntityChecker(entityChecker);
        OWLClassExpression owlExpression = null;
	try {
	    owlExpression = parser.parseClassExpression();
	} catch (ParserException e) {
	    // TODO Auto-generated catch block
	    e.printStackTrace();
	}
        return owlExpression;
    }