Web Reference: This example explains the two fundamental reasons to use the directed aggregation relationship. This is the SysML relationship with the open-ended diamond. ... Feb 23, 2014 · I know dependency "uses-a" and inheritance "is-a" but I'm a bit unfamiliar with Aggregation, Composition, Association and Direct Association; also, which of them is "has-a" relationship. The question "What is the difference between association, aggregation, and composition" has been frequently asked lately. Aggregation and Composition are subsets of association meaning they are specific cases of association.
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