[kepler-users] Query with the Expression actor

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[kepler-users] Query with the Expression actor

Hi, Coming to think of it, I think the Expression actor can be (has been, in my case) used as a Synchronizer. Its purpose is to simply wait for the other tasks to be completed, that is, the other tasks once completed are given to the port 'a2' of the expression, and the actor outputs 'a1'.