MQCD_* (Channel definition structure)
| MQCD_VERSION_1 | 1 | X'00000001' |
| MQCD_VERSION_2 | 2 | X'00000002' |
| MQCD_VERSION_3 | 3 | X'00000003' |
| MQCD_VERSION_4 | 4 | X'00000004' |
| MQCD_VERSION_5 | 5 | X'00000005' |
| MQCD_VERSION_6 | 6 | X'00000006' |
| MQCD_VERSION_7 | 7 | X'00000007' |
| MQCD_VERSION_8 | 8 | X'00000008' |
| MQCD_VERSION_9 | 9 | X'00000009' |
| MQCD_VERSION_10 | 10 | X'0000000A' |
| MQCD_VERSION_11 | 11 | X'0000000B' |
| MQCD_CURRENT_VERSION | 11 | X'0000000B' |
| MQCD_LENGTH_4 | (value differs by platform or version) | |
| MQCD_LENGTH_5 | (value differs by platform or version) | |
| MQCD_LENGTH_6 | (value differs by platform or version) | |
| MQCD_LENGTH_7 | (value differs by platform or version) | |
| MQCD_LENGTH_8 | (value differs by platform or version) | |
| MQCD_LENGTH_9 | (value differs by platform or version) | |
| MQCD_LENGTH_10 | (value differs by platform or version) | |
| MQCD_LENGTH_11 | (value differs by platform or version) | |
| MQCD_CURRENT_LENGTH | (value differs by platform or version) |