UML14 — UML 1.4: State containment problem

According to the UML 1.4 metamodel, a State can either be contained as a
"subvertex" in a CompositeState [UML 1.4, pp. 2-147], as the "top" state in
a StateMachine [UML 1.4, pp. 2-147], or as an "ownedElement" [UML 1.4, pp.
2-13] in a Model, Package, Artifact, Node or ClassifierRole (all other
concrete subclasses of Namespace restrict their owned elements to exclude
State). The latter containment does not seem to make a lot of sense.

Fortunately, the description of a StateMachine states that "This means that
a state machine owns its transitions and its top state. All remaining states
are transitively owned through the state containment hierarchy rooted in the
top state." [UML 1.4, pp. 2-153].

The question is: does this mean that a State is restricted to being
contained in a CompositeState or a StateMachine? If not, please explain the
meaning of e.g. a State contained directly in an otherwise empty Package?

If the mentioned restriction is intended, it should be stated
unambiguously so in the wellformedness rules for State:

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