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A semantics for a graphical specification language of realtime properties (Constraint Diagrams) is presented. The new semantics is given in terms of Timed Automata. A model in terms of Timed Automata satisfies the property given by a Constraint Diagram if the model in parallel composition with the semantics of the Constraint Diagram can reach a certain state. This kind of question can be checked by all model-checkers for Timed Automata. A prototype of a tool is presented that automatically translates an appropriate Constraint Diagram into the input language of the tool Uppaal.

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