![]() It defines a part-whole or part-of relationship. In case if a range is not specified, one is considered as a default multiplicity.įor example, multiple patients are admitted to one hospital.Īggregation: An aggregation is a subset of association, which represents has a relationship. Multiplicity: It defines a specific range of allowable instances of attributes. It depicts how many objects are there in the relationship.įor example, a department is associated with the college.
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