UML22 — Unconsistent Profile extension description (02)

18.3.5 says that "A profile by definition extends a reference metamodel or another profile."
While in theory I could see how it might be modeled, I don't see how the latter could work in practice with real tools. Let's extend the current example and define a new Profile called ClockTechnology with Stereotype AtomicClock with baseClass Clock and property radioactiveElement:String..."
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Import between profiles is supported, and stereotype generalization is the usual way to achieve what has been called "extending a profile".

The reference to profile extension should be simply discarded. A profile extends a reference metamodel.
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Discussion

In Profiles:Profile:semantics, change the first sentence

A profile by definition extends a reference metamodel or another profile.

Into

A profile by definition extends a reference metamodel.

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