UML22 — UML 2 Super / Kernel features / cannot exclude superclass properties

In practice it is not always possible to refactor class hierarchies to ensure that all attributes are defined in the appropraite classes in that hierarchy. For example, a class hierarchy may be supplied by a third party or may be used by multiple products whereas the refactoring may only be required in a subset of them. In such cases, it is extremely useful to be able to exclude undesirable features inherited from a superclass. This einently practical technique should be supported in UML to allow those systems that use that feature to be properly modeled.

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