@Override
 public String toString() {
   OCLExpression bodyExpression = specification.getOwnedBody();
   if (bodyExpression != null) {
     return "<"
         + delegateDomain.getURI()
         + ":query> "
         + bodyExpression; //$NON-NLS-1$ //$NON-NLS-2$
   } else {
     return "<"
         + delegateDomain.getURI()
         + ":query> "
         + specification.getBody(); // $NON-NLS-1$ //$NON-NLS-2$
   }
 }