5.4 Model structuring elements
UML 2 has three major concepts for structuring the model: type, role and relationship.
Type: A type is used in three ways: to classify elements, as a shorthand used to specify another element and for type checking.
Role: A role is used to represent something, without specifying which particular thing.
Relationship: A relationship is used to represent some structure in the model.
It represents a structure that is present in the model, but not necessarily specified to also appear in the system or its environment.
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