| MQSelect of mqrvar * mqlist * mqbool (* rvar, list, boolean *)
| MQUse of mqlist * mqsvar (* list, Position attribute *)
| MQUsedBy of mqlist * mqsvar (* list, Position attribute *)
| MQSelect of mqrvar * mqlist * mqbool (* rvar, list, boolean *)
| MQUse of mqlist * mqsvar (* list, Position attribute *)
| MQUsedBy of mqlist * mqsvar (* list, Position attribute *)