{xor} constraint



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Tewfik Ziadi (Tewfik.Ziadi@irisa.fr)
Mon, 18 Mar 2002 18:43:27 +0100


Hello everybody, We find in UML metamodel {xor} constraint(see for example UML1.4 Standard (1) pp 2- 70 : Extension Mechanism). It 's applied to a set of associations, specifying that over that set, exactly one is manifest for each associated instance. In UML1.4 Semantics: this constraint is defined as "Standard Constraints" in "Association" context (see page 2-20) What represent this constraint in term of UML element? and how we can get this constraint at meta-level? (1): September 2001 Thanks -- Tewfik


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