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A package is a grouping of model elements which means that a package can contain model elements of different kinds, including other packages to create hierarchies. A package defines a namespace for its contents using for various purposes.
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Use cases show what your system should do. Activity diagrams allow you to specify how your system will accomplish its goals. Activity diagrams show high-level actions chained together to represent a process occurring in your system. Activity diagrams are particularly good at modeling business processes or elaborating a use case. This article shows you how to do so.
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