UML22 — p.352, section 12.3.35. The attribute Parameter.isStream is inappropriate

p.352, section 12.3.35. The attribute Parameter.isStream is inappropriate as it creates a mechanism for activities to pass data different from the other behaviors. CommonBehavior specifies that parameters obtain data when a behavior is invoked and generate outputs when a behavior terminates. Behaviors may generate data during the execution of the behavior by signal send and receipts. There is no reason for activities not to use the same mechanism; it is no more difficult to use than the isStream mechanism introduced. Whether outputs are generated during the lifetime of a behavior or upon termination only, and whether inputs are accepted only at the beginning of an execution are properties of the action, not the parameters, and should such be treated.

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