Packages
Visibility of Owned Elements
Public (+)
Private (-)
Protected (#)
A Package exports all its public elements
Subsystem - A Stereotyped Package
It is a package of elements treated as a unit which includes a specification of the behavior of the entire package contents as a coherent unit
A subsystem is modeled as a package and as a class
A subsystem has a set of interfaces which describes its relationship to the rest of the system
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