Composition
- Special Case of Aggregation.
- When one class is highly dependent on the other. For example, Library and books.
- Strong Existence Relation — Composition means that the contained object cannot exist without the aggregation (for example, a car reservation cannot exist without the car rental agency).
- Lifetime of individual parts = Lifetime of aggregate
- What kind of relationship?
- PART - OF
- Existence-dependent whole-part relationship
Children