UML14 — UML 1.4: AttributeLink containment error

AttributeLink is unconditionally contained in an Instance [UML 1.4, pp.
2-97, fig.2-16], as well as being contained in a LinkEnd [UML 1.4, pp. 2-98,
fig.2-17].

The former containment obviously prevents the latter from ever being
realized.

Note: If changing the former containment from mandatory to optional, please
remember to exclude AttributeLink from other composite containments
implicitly enabled by such a change - such as being an ownedElement of a
Namespace, or a parameter of a template.

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