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Unified Modeling Language Reference Manual, The, Second Edition by Grady Booch, Ivar Jacobson, James Rumbaugh

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constraint

A semantic condition or restriction represented as text in natural language or a specified formal language.

Semantics

A constraint is a semantic condition or restriction expressed as a linguistic statement in some textual language.

In general, a constraint can be attached to any model element or list of model elements. It represents semantic information attached to a model element, not just to a view of it. Each constraint has a body and a language of interpretation. The body is a string encoding a Boolean expression for the condition in the constraint language. A constraint applies to an ordered list of one or more model elements. Note that the specification language may be a formal language or it may be a natural language. In the ...

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