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It can be determined in translate5 which MQM types are available by default for a task. In addition, when creating a task, each task can be given its own set of MQM types only valid for this task.
Please have a look at the structure of translate5's zip import package format to see, how this works.
MQM statistics
translate5 creates on-the-fly MQM statistics on assigned MQM tags at any time. It can be accessed within the Editor in graphically well presented form or alternately as an XML download from the task overview (export action icon).
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