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constraint
subject			fact

constraint	can be written in in any language supported by a given tool
	cannot compute a non-boolean result
	cannot have any side-effects
	cannot modify any data
	has definition A small block of text in curly brackets embedded in a UML diagram. It is normally written in a formal language which can be interpreted by a computer
	expresses a logical statement that should evaluate to true
	is a subtopic of 5.6 - More Advanced Features of Class Diagrams
	is written in braces (curly brackets) in a UML diagram
	is a kind of criterion