Several different modeling languages are well suited to modeling structural aspects of requirements in the data perspective. Commonly, entity-relationship models, extensions of the traditional entity-relationship model according to Chen [Chen 1976.], and, increasingly, class diagrams of the UML (e.g., [Rumbaugh et al. 2005]) are used as requirements models of the data perspective.
[The traditional entity-relationship model] Traditionally, entity-relationship diagrams are used for modeling the data perspective because they display the structure of an object of an universe of discourse by means of entity types and relation types [Chen 1976].
[Extensions of the entity-relationship ...
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