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The same modeled UseCase may be visually depicted as separate ellipses within multiple subject rectangles.

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Figure D.6 - Establishing Operational Use Cases for Drive the Vehicle
Visual containment of the symbol for a UseCase in the rectangular symbol for a subject Classifier does NOT imply ownership! Packaging (ownership) of UseCases is separate from use within subjects, and a single UseCase may be used in more than one subject.
Source
Unified Modeling Language 2.5.1
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
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NOTATION
UML keywords
UseCase
UseCase Diagram
UseCase::subject
A subject for a set of UseCases (sometimes called a system boundary) may be shown as a rectangle with its name in the top-left corner, with the UseCase ellipses visually located inside this rectangle.
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The same modeled UseCase may be visually depicted as separate ellipses within multiple subject rectangles.
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Where a subject is a Classifier with a standard stereotype, the keyword for the stereotype shall be shown in guillemets above the name of the subject.
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