public static OWLClassExpression parseClassExpression(String expression) throws ParserException {
	ManchesterOWLSyntaxEditorParser parser = new ManchesterOWLSyntaxEditorParser(factory, expression);
	parser.setDefaultOntology(ontology);
	parser.setOWLEntityChecker(entityChecker);
	OWLClassExpression owlExpression = null;
	owlExpression = parser.parseClassExpression();
	return owlExpression;
    }