Some rules of task attributes association
 
  • A composite and elementary task is either automatic, interactive or manual.
  • A composite automatic task contains only automatic composite and elementary) tasks.
  • A composite manual task contains only manual, composite and elementary tasks.
  • A composite interactive task contains interactive, composite and elementary tasks, and may contain automatic, composite and elementary tasks.
  • By default, the cardinality on a task is [0 , ?) for optional task and [1 , ?) for mandatory tasks.

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