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Stereotypes (<< >>) can be used to extend the UML notational elements

Stereotypes may be used to classify and extend associations, inheritance relationships, classes, and components

Examples:

Class stereotypes:  boundary, control, entity, utility, exception

Inheritance stereotypes:  uses and extends

Component stereotypes:  subsystem

Extensibility of UML

Stereotypes — extends vocabulary (metaclass in UML metamodel)

Tagged values — extends properties of UML building blocks (i.e., metamodel)

Constraints — extend the semantics of UML building blocks.

More on this later

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