Relationships
Relationships among classifiers are association, generalization, and various kinds of dependency, including realization and usage (see Table 4-2).
| Relationship | Function | Notation |
|---|---|---|
| association | A description of a connection among instances of classes |  |
| dependency | A relationship between two model elements |  |
| generalization | A relationship between a more specific and a more general description, used for inheritance and polymorphic type declarations | |
| realization | Relationship between a specification and its implementation | |
| usage ... |
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