Study Cards on aggregationkind, composition, association
The multiplicity at the part end can be any legal value.
What do we allow in this figure?
We allow for two Covers because one would be the Front and other the Back, as we show in Fig. 10.24.
We also use separate composition relationships instead of the more common tree-like structure as we show in Fig. 10.25.
However, it is common not to ??
A Book is composed of two Covers
A Book has two parts that are Covers
A Cover is a part of a Book
In these relationships, we technically can say that the AggregationKind = Composite.
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