UML14 — UML 1.4: Action problem in Collaborations

n UML 1.4, an Action is only used in the context of a StateMachine or a
CollaborationInstanceSet.

In a CollaborationInstanceSet, an Action is required as the cause of a
Stimulus [UML 1.4, pp. 2-97], but since the Action can only be contained in
a Namespace (or in the context of a StateMachine, which is irrelevant here),
it cannot be contained in the Stimulus, nor in the Instances the Stimulus
connect, nor in the InteractionInstanceSet or CollaborationInstanceSet they
are part of. The "nearest" possible container is the Package that happens to
contain the CollaborationInstanceSet.

Intuitively, this makes no sense - used in this context, the Action is
clearly part of the InteractionInstanceSet, or the participating Instances
or Stimuli.

If this error report is rejected, please elaborate on the intended
containment structures for Collaboration instances.

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