Architecting and designing : UML 2.5 : Package views
  
Package views
A Package represents a grouping mechanism that provides a namespace for contained model artifacts.
UML allows for a Package diagram that is used to visually show the high-level structure of the architecture.
See
Package
Package Import relationship
Package Containment relationship
Package diagram
See also
Introduction to UML 2.5
Diagram views
Model Elements
Relationships
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UML 2.5