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A '''data model is''' is a model that describes in an abstract way how data is represented in an [[information system]] or a [[database]]. In general it describes the following aspects:
# ''Structure:'' defines what the structure of the representation is. This should not only specify how data is represented but also how a schema can be specified that defines the structure of the data in a
# ''Integrity:'' provides a language for the definition of rules that restrict which instances of the defined structure are allowed.
# ''Manipulation:'' provides a language in which updates of the data can be expressed.
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