UML22 — Section: Activities - Pin ordering semantics

Pin ordering semantics. In Activities, InputPin, OutputPin, the semantics of ordering inherited from ObjectNode should be related to multiplicity ordering inherited from MultiplicityElement. For example, if an output pin of ReadStructuralFeatureAction has an object node ordering of FIFO, and the structural feature is ordered (which means the multiplicity ordering of the pin is also), then perhaps the multiple values posted by a single execution of the action should be drawn from the pin in the same order as in the structural feature. Since the action will post the values to the output pin at the same time, currently FIFO ordering on the pin will be indeterminant

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