Change indicators


      MSG   MESSAGE TYPE IDENTIFICATION

      Function: To identify a message type and to give its class and
                maintenance operation.

010   C709  MESSAGE IDENTIFIER                             M  
      1475   Message type identifier                       M  an..6
      1056   Version                                       M  an..9
      1058   Release                                       M  an..9
      1476   Control agency                                M  an..2
      1523   Association assigned identification           C  an..6
      1060   Revision number                               C  an..6
      1373   Document/message status, coded                C  an..3

020   1507  CLASS DESIGNATOR, CODED                        C  an..3

030   4513  MAINTENANCE OPERATION, CODED                   C  an..3