Aggregation SemanticsDefinitions

• Aggregation is a special kind of association

  • “Part-of”-relationship
  • The whole (complex object) and its parts form a conceptual unit

• Properties:

  • Transitivity: C is part of B and B is part of A ß C is part of A
  • Anti-Symmetry: B is part of A ß A is NOT part of B

• UML supports two kinds of aggregation:

  • (“weak”) Aggregation
  • Composition

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