| relationships | between components |
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association / aggregation / composition. Aggregation and Composition are subsets of association meaning they are specific cases of association. Association is a relationship where all objects have their own lifecycle and there is no owner. |
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Aggregation is a specialised form of Association where all objects have their own lifecycle_, but there is ownership and child objects can not belong to another parent object. Composition is again specialised form of Aggregation and we can call this as a “death” relationship. It is a strong type of Aggregation. Child object does not have its lifecycle and if parent object is deleted, all child objects will also be deleted. |