August 2018
Beginner
594 pages
22h 33m
English
Content preview from Software Architect's Handbook
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Aggregation
Aggregation is a relationship in which a child object can exist independently of the parent. It is graphically represented by a hollow diamond shape. For example, in a domain with a Tire object, we can say that, even though a Car object has Tire objects, a Tire object can exist without a Car object: