if (children != null) { ret.children = children.clone(stylesheet); } if (next != null) { ret.next = next.clone(stylesheet); } return ret;
  TemplateNode clone(Stylesheet stylesheet)  {    return new AttributeNode((children == null) ? null :                             children.clone(stylesheet),                             (next == null) ? null : next.clone(stylesheet),                             name.clone(stylesheet),                             (namespace == null) ? null :                              namespace.clone(stylesheet),                             source);  }