cannot find my classifier profile tag at an interface

[ngong]

Problem:
Tags of a stereotype extending Classifier meta class do not appear at Interfaces.

EA seems to identify only the Component and Class meta classes as inherited from Classifier. According to UML 2.5 DataType and Interface meta classes - at least - should be Classifiers as well.

Motivation:
In order to cope with variants I introduced a stereotype named variant-specific with two tags: variant and replaces. The idea is to have all elements as part of the reference model that do not use the variant-specific stereotype. If a list of variants is entered in the regarding tag, that element contributes to those variants, optionally replacing elements of the same type as found in the reference model. (If you want to exclude an element from a variant, introduce an empty one that overloades it. This could be a whole package.)

As all my variing elements are Components, Classes, DataTypes, and Interfaces I thought it would be a good idea to use Classifier as a meta class for "variant-specific".

My workaround so far:
Define the one stereotype variant-specific as an extension to all meta classes where one likes to see those tags. (This results in the wanted behavior of EA, but what about the UML 2.5 compliance, regarding the set and interrelationsships of meta classes?)