Despite the development of many modeling formalisms and model solution methods, most tool implementations support only a single formalism. Furthermore, models expressed in a chosen formalism cannot be combined with models expressed in other formalisms. This paper describes a modeling tool called Möbius, which provides an infrastructure to support multiple interacting formalisms and solvers, and is extensible in that new formalisms and solvers can be added to the tool such that they can interact with those already implemented without requiring additional changes to the previously implemented ones. We discuss the initial implementation of Möbius, and the recent addition of different formalisms and solution techniques to the tool.
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