A Package diagram falls under the structural diagramming family. The Package diagram shows packages and dependencies between the Packages.

The classes can be grouped into packages. The packages can be nested within other packages. A Package, as an entity, may have all the relationships that can be drawn for a class. Those relationships are derived from the classes or packages that are nested within two particular packages (i.e., the relationship between packages reflects a set of relationships between classes placed in those packages).

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