*uri = nsXPIDLCString::Copy("rdf:window-mediator");
*uri = nsXPIDLCString::Copy("rdf:charset-menu");
  NS_IMETHOD GetURI(char ** uri)  {    if (!uri) return NS_ERROR_NULL_POINTER;    *uri = nsXPIDLCString::Copy("rdf:window-mediator");    if (!(*uri)) return NS_ERROR_OUT_OF_MEMORY;    return NS_OK;  }