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DEVS is a well known formalism for modelling discrete-event, continuous-time systems, suitable for the definition of efficient simulators of those systems. A tool is presented which allows the graphical definition of DEVS models. The tool is capable of generating a representation suitable for simulation by the PythonDEVS simulator, an implementation of the standard classic DEVS simulation algorithm. The tool itself is automatically generated from a meta-model. The simulator generation is realized by graph-transformation. The paper demonstrates how dedicated modelling and simulation environments can be easily generated from meta-models and graph-transformation environments.
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