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In particular, there is scope for confusion between a UseCase appearing visually contained in a boundary rectangle representing a Classifier that is its subject, and appearing visually contained in a compartment of a Classifier that is its owner...

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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::subject
Classifier
Note that this notation for the subject classifier differs from the normal Classifier notation – it has no header or compartments.
Full quote
In particular, there is scope for confusion between a UseCase appearing visually contained in a boundary rectangle representing a Classifier that is its subject, and appearing visually contained in a compartment of a Classifier that is its owner (see Figure 18.9).
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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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