UML14 — UML 2 Super / Profiles / problem with name collisions

The new rule for extension end role names as adopted in ballot 10 (specifically for metaclass extension role names) is likely to lead to name collisions. For example, a stereotype that extends the Package metaclass with a property named 'basePackage' would conflict with the recommended role name of the metaclass extension end ('basePackage'). The recommended role names should be less likely to collide with names that might be chosen for stereotype properties, for example, base$"ExtendedMetaClassName" (i.e. base$Package).

see above