UML14 — UML 1.4: ExtensionPoint containment problem

According to the UML 1.4 metamodel, an ExtensionPoint [UML 1.4, pp. 2-135]
can be contained as an ownedElement [UML 1.4, pp. 2-13] in a Model, Package,
Artifact, Node or ClassifierRole (other containers excluded because of
restrictions they make on the "ownedElement" containment in their
wellformedness rules).

The questions are: what is the intended meaning of an ExtensionPoint in eg.
an otherwise empty Package? Why isn't the ExtensionPoint contained in the
UseCase it extends, as would appear more logical to the uninitiated?

Suggestion: change the association between ExtensionPoint and UseCase [UML
1.4, pp. 2-135] to an unconditional composite containment (with
ExtensionPoint as the part).

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