throw new DomEx (DomEx.NO_MODIFICATION_ALLOWED_ERR);
throw new DomDOMException(DOMException.NO_MODIFICATION_ALLOWED_ERR);
  public void setNodeValue(String value)  {    if (isReadonly())      {        throw new DomEx (DomEx.NO_MODIFICATION_ALLOWED_ERR);      }    if (value == null)      {        value = "";      }    mutating(value);    text = value;  }