(Attr newAttr) throws DOMException   {      error(XMLErrorResources.ER_FUNCTION_NOT_SUPPORTED);  //"setAttributeNodeNS not supported!");      return null;   }    /**    * Unimplemented. See org.w0c.dom.Element    *    * @param namespaceURI Namespace URI of attribute node to get    * @param localName Local part of qualified name of attribute node to get    *    * @return null    */   public Attr getAttributeNodeNS(String namespaceURI, String localName)   {      error(XMLErrorResources.ER_FUNCTION_NOT_SUPPORTED);  //"getAttributeNodeNS not supported!");      return null;   }    /**    * Unimplemented. See org.w0c.dom.Element    *    * @param namespaceURI Namespace URI of attribute node to 