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The Unified Modeling Language (UML) still lacks a formal and commonly agreed specification of its semantics that also accounts for UML's built-in semantic variation points and extension mechanisms. The semantics specification of such extensions must be formally integrated and consistent with the standard UML semantics without changing the latter. Feasible semantics approaches must thus allow advanced UML modelers to define domain-specific language extensions in a precise, yet usable manner. Wedoi:10.1109/hcc.2001.995242 dblp:conf/vl/HausmannHS01 fatcat:7rpn2l6i3fempnc7stpid4jmve