UML22 — text p.297

The text p.297: [1] An action execution is created when all its object flow and control flow prerequisites have been satisfied (implicit join). Exceptions to this are listed below. The flow prerequisite is satisfied when all of the input pins are offered tokens and accept them all at once, precluding them from being consumed by any other actions. contains, I believe, the problems: 1. Flows need not be connected by input pins, so ``inputs'' must replace ``input pins''. 2. The current text implies that all offered tokens are consumed when an action starts, which is not intended, we believe (specially if two offers are incompatible). 3. ``precluding them from being consumed by any other actions'' does not belong here. We suggest: To start, the action must have at least one token per input. When starting, it accepts simultaneously exactly one token per input, then creates an action execution.

see above