if (children != null) { ret.children = children.clone(stylesheet); } if (next != null) { ret.next = next.clone(stylesheet); } return ret;
  TemplateNode clone(Stylesheet stylesheet)  {    return new ParameterNode((children == null) ? null :                             children.clone(stylesheet),                             (next == null) ? null :                             next.clone(stylesheet),                             name,                             select.clone(stylesheet),                             global);  }