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DEVS (discrete event system specification) is a popular method for specifying discrete event simulation models. Though there are a number of simulators for DEVS, they usually do not provide an easy-to-use graphical interface, while, even if they do, it is simulator-specific. Thus, even if the modeler specifies the same model using DEVS, he/she has to create it from scratch for every discrete simulator. On the other hand, UML is a standard modeling language providing graphical representation of models and code generation capabilities. In this paper, we discuss our effort to combine UML with DEVS to build simulation models, promoting software engineering methods in the simulation world. Such an endeavor should facilitate a standard method to define DEVS models and promote interoperability between DEVS simulators. The first step towards this, is the formal definition of the DEVS UML 2.0 profile proposed in this paper.