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Object Constraint Language (OCL)
subject			fact

Object Constraint Language	contains many built-in keywords designed to formally specify constraints in software models
	has definition A language used to write Boolean constraints and assertions in UML
	is the recommended language for writing constraints in a UML diagram
	is a subtopic of 5.6 - More Advanced Features of Class Diagrams
	is abbreviated as OCL
	is an instance of specification language
	is not related to Java
	see also OCL expression
	see also OCL statement