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Extension Point UML Use case diagram

 

Registration use case is conditionally extended by Get Help On Registration use case in extension point Registration Help.

Registration use case is conditionally extended by Get Help On Registration
use case in extension point Registration Help.

Extension points may be shown in a compartment of the use case oval symbol under the heading extension points. Each extension point must have a name, unique within a use case. Extension points are shown as a text string according to the syntax:

extension point ::= name [: explanation ]

The optional explanation is some description usually given as informal text.

Registration use case with extension points Registration Help and User Agreement

Registration use case with extension points
Registration Help and User Agreement

Extension points may be shown in a compartment of the use case rectangle with ellipse icon under the heading extension points.

Extension points of the Registration use case, shown using the rectangle notation

Extension points of the Registration use case,
shown using the rectangle notation

 

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