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UML and Data Modeling: A Reconciliation by David Hay

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According to the UML specification, a composite structure is a composition of interconnected elements, representing run-time instances collaborating over communications links to achieve some common objectives.[50] That is, it is analogous to a product structure, where the interior boxes are components of the outer box.

A composite structure diagram is represented by a larger rectangle, with its components (which may be classes, packages, or operations) contained as symbols within it. To look at the diagram shown in Figure 4-5 as a composite structure diagram is to imagine that Person and Organization are components of Party, not sub-types of it.

To solve this ambiguity, Figure 4-5 includes the generalization lines in the boxes.

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