UML Composite Structure Diagram

Composite Structure Diagram⌘

• Describes the internal structure of a classifier and the collaborations that this structure makes possible.
• Structured Classifiers may contain an internal structure of connected elements each of which plays a role.
• Encapsulated Classifier extends Structured Classifier with the ability to own Ports, a mechanism for isolating an Encapsulated Classifier from its environment.

Role and Part⌘

• Role represents a participant within the internal structure of a Structured Classifier.
• Part is special kind of Role (owned using composition).
• A part may be shown by graphical nesting of a box symbol with a solid outline representing the part.
• A role that is not a composition may be shown by graphical nesting of a box symbol with a dashed outline.

Connector⌘

• A Connector specifies links between two or more instances playing roles within a structured classifier.

Port⌘

• A Port represents interaction point through which an Encapsulated Classifier communicates with its environment.