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Relationships
Dependency
A dependency is a semantic relationship between two things in which a change to one thing (the independent thing) may affect the semantics of the other thing (the dependent thing).
Association
An association is a structural relationship that describes a set of links; a link is a connection among objects.
Generalization
Generalization is a specialization/generalization relationship in which objects of the specialized element (the child) are substitutable for objects of the generalized element (the parent).
