UML14 — UML 1.4: Action containment error

Because Action is a ModelElement, it may be contained as an ownedElement
[UML 1.4, pp. 2-13, fig. 2-5] in a ClassifierRole, Model, Package, Artifact,
Node or Collaboration (all other concrete subclasses of Namespace restrict
their owned elements to exclude Action).

Because Actions are only used in the context of either a StateMachine or a
CollaborationInstanceSet, this containment does not seem to make sense.

In order to exclude these containments, the wellformedness rules for Action
could include the following statement:

self.namespace = null

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