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This is a UML class diagram example for the Decorator pattern.

Purpose
Allows for the dynamic wrapping of objects in order to modify their existing responsibilities and behaviors.

Use When
- Object responsibilities and behaviors should be dynamically modifiable.
- Concrete implementations should be decoupled from responsibilities and behaviors.
- Subclassing to achieve modification is impractical or impossible.
- Specific functionality should not reside high in the object hierarchy.
- A lot of little objects surrounding a concrete implementation is acceptable.