if (dt instanceof ObjectType) { retval.add(dt); } }  return retval;
return ObjectType.wrap(result);
    public Collection getObjectTypes() {        Iterator it = m_types.values().iterator();        Collection retval = new ArrayList();        while (it.hasNext()) {            DataType dt = (DataType)it.next();            if (dt instanceof ObjectType) {                retval.add(dt);            }        }        return retval;    }