public static void subclasses(String expression){
	OWLCLassToRender currentClass = null;
	try {
	    currentClass = Brain.getClassToRender(expression);
	} catch (ParserException e1) {
	    error(404, "'" + expression + "' is not a valid OWL class expression");
	}
	List<OWLCLassToRender> subClasses = null;
	try {
	    subClasses = Brain.getSubClassesToRender(expression, false);
	} catch (ParserException e) {
	    error(404, "'" + expression + "' is not a valid OWL class expression");
	}
	render(expression, currentClass, subClasses);
    }