  /** Support at least "name" for UIs. */
  oyCMMGetText_f       getText;
  const char        ** texts;          /**< zero terminated list for getText */

  char               * connector_type; /**< a @ref registration string */
  /** Check if two oyCMMapi7_s filter connectors of type oyConnector_s can 
   *  match each other inside a given socket and a plug. */
  oyCMMFilterSocket_MatchPlug_f  filterSocket_MatchPlug;

  /** make requests and receive data, by part of oyFilterPlug_s */
  int                  is_plug;
