UML14 — The class "Subsystem" inherits from "GeneralizedElement" twice

Summary: The class "Subsystem" inherits from "GeneralizedElement" twice:

SubSystem->Package->GeneralizableElement
SubSystem->Classifier->GeneralizableElement

The only functionality it adds to Package is the ability to add operations at the Subsystem level as indicated by the statement below:

"In the metamodel Subsystem is a subclass of both Package and Classifier, whose Features are all Operations."

I would recommend simplification of the class hierarchy by merging "Subsystem" into "Package" and deriving "Package" from "Classifier":

Package->Classifier->GeneralizableElement

The attibute "isInstantiable" of Subsystem can be moved up to Package.

Considered and declined.