      {
      {           common deck dmdlun
      {
      TYPE
         dmt$logical_unit_specification = RECORD
                  CASE by_recorded_vsn:BOOLEAN OF
                      =TRUE=
                           recorded_vsn:rmt$recorded_vsn,
                      =FALSE=
                           logical_unit_number:iot$logical_unit,
                  CASEND,
                                          RECEND;
*copyc IOT$LOGICAL_UNIT
*copyc RMD$VOLUME_DECLARATIONS
