RPG declaration (copy file CMQDHH)

     D*..1....:....2....:....3....:....4....:....5....:....6....:....7..
     D* MQDH Structure
     D*
     D* Structure identifier
     D  DHSID                  1      4
     D* Structure version number
     D  DHVER                  5      8I 0
     D* Length of MQDH structure plus following MQOR and MQPMR records
     D  DHLEN                  9     12I 0
     D* Numeric encoding of data that follows the MQOR and MQPMR records
     D  DHENC                 13     16I 0
     D* Character set identifier of data that follows the MQOR and MQPMR
     D* records
     D  DHCSI                 17     20I 0
     D* Format name of data that follows the MQOR and MQPMR records
     D  DHFMT                 21     28
     D* General flags
     D  DHFLG                 29     32I 0
     D* Flags indicating which MQPMR fields are present
     D  DHPRF                 33     36I 0
     D* Number of MQOR records present
     D  DHCNT                 37     40I 0
     D* Offset of first MQOR record from start of MQDH
     D  DHORO                 41     44I 0
     D* Offset of first MQPMR record from start of MQDH
     D  DHPRO                 45     48I 0