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In previous work we contributed to the definition of an executable profile of UML, called OMEGA UML, dedicated to the formal specification and validation of real-time systems. The prominent features of OMEGA UML are (1) a small and coherent set of concepts for describing the architecture and the behaviour of a system, (2) means for formalizing the properties of the system, in particular timing properties, and (3) a well-behaved concurrent execution model suited for real-time applications. To meet user demands, the profile has recently been updated to include hierarchical composite structures (part of the standard UML 2. x specification) and new concurrency structures. The new version (OMEGA2) is in line with the original principles: simplicity, well-defined operational semantics and tool support for simulation and verification (IFx version 2). The present paper contains an overview of both the profile and the tool.