Can you think of has-a relationships that are optional

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Reference no: EM132084506

All of you Object-Oriented Design folks have heard of "Has-a" (a car has tires) and "Is-a" (a car is a Buick).

We represent these using the Minimum and Maximum cardinality ratios of a relationship.

Can you think of Has-a relationships that are optional? How about Is-a relationships?

Reference no: EM132084506

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