A package is a grouping of model elements and is represented by a symbol that looks like a manila file folder . You can imagine an entire system description as a package with all the system elements in it, including other packages, models, diagrams, and elements.
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A package is the basic organizing element of a UML model. It provides a namespace for the grouped elements. Each element belongs to only one package, and one package can be nested in another. You can create new packages or add elements or views (diagrams) to packages by right-clicking icons in the tree view.
