UML22 — Unconsistent association extension description

b) More worryingly, 18.3.5 Semantics also says "As part of a profile, it is not possible to have an association between two stereotypes or between a stereotype and a metaclass unless they are subsets of existing associations in the reference metamodel." I fail to see how a profile could in fact could cause an association between 2 stereotypes to subset an existing association in a reference metamodel since the stereotypes do not at all inherit from the baseClasses so do not inherit any of its properties or associations in order to be able to subset them: this is emphasized by the MOF representation shown in the new Figure 447.
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Indeed profiles do not support association subsetting. This should be made clear in the spec to avoid any confusion while using profiles.
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Discussion

In Profiles:Profile:semantics, change the paragraph

As part of a profile, it is not possible to have an association between two stereotypes or between a stereotype and a metaclass unless they are subsets of existing associations in the reference metamodel.

Into

As part of a profile, it is not possible to have an association between two stereotypes or between a stereotype and a metaclass.

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