Associations - Composition and Aggregation - Aggregation

4 important questions on Associations - Composition and Aggregation - Aggregation

What is the AggregatonKind of an aggrgation?

The AggregationKind = Shared.
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Why is the AggregationKind "Shared"?

We call it “shared” because the target end can be associated with of more than Book.
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How do we read this diagram?

When you read an aggregation, you usually should just use “has.” We show an example of an aggregation/shared in Fig. 10.26.


A Book has many Authors



or


An Author is a shared part of many Books
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Unfortunately, as you might realize, the semantics of an aggregation is nearly identical to that of a  ....?


Unfortunately, as you might realize, the semantics of an aggregation is nearly identical to that of a regular association.

Anytime we use an aggregation, we could probably replace it with a plain association.

You should only use an aggregation if you want to emphasize a part-like relationship, but one that is not as strong as a composition.
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