Chapter 5 Building Dynamic Diagrams
A join is the synchronization of several parallel transitions. It is a complex transition with two or more source activities and one destination activity.
A join should have more than one input flow, and have only one output flow.
The activities associated with each of the paths above the join symbol are parallel. In a join, concurrent transitions synchronize. Each transition waits until all input flows reach the join before continuing; the first executed transition waiting for the last one to complete. After the join, only one transition continues below the join.
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