throw new DomEx(DomEx.NOT_FOUND_ERR, localPart, null, 0);
throw new DomDOMException(DOMException.NOT_FOUND_ERR, localPart, null, 0);
  public void removeAttributeNS(String namespace, String localPart)  {    if (attributes == null)      {        throw new DomEx(DomEx.NOT_FOUND_ERR, localPart, null, 0);      }    attributes.removeNamedItemNS (namespace, localPart);  }