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Melange workbench

Melange is a language and platform for assembling and integrating multiple domain-specific languages (DSL).

Melange takes the form of a programming language where models are first-class citizens and languages are used to instantiate and manipulate them. By analogy with the class-based, object-oriented paradigm, Melange can be classified as a language-based, model-oriented programming language.

Melange embed a model-oriented type system that provides model polymorphism and substitutability, i.e. the possibility to manipulate a model through different interfaces and to define generic transformations that can be invoked on models written using different DSLs.

Melange is tightly integrated with the Eclipse Modeling Framework ecosystem and relies on the Ecore implementation of the EMOF meta-language for the definition of the abstract syntax of DSLs through meta-modeling. Executable meta-modeling is supported by weaving operational semantics defined with the K3 meta-language.

Melange is bundled as a set of Eclipse plug-ins. Please refer to the installation instructions for more information.


  • Executable metamodeling. Melange is tightly integrated with K3, a meta-language that leverages aspect-oriented modeling to weave operational semantics in metamodel definitions.
  • Language composition Using high-level operators (e.g. inheritance, merge, slice), language definitions can be manipulated, extended, or customized to create new DSLs.
  • Language Interoperability Melange‚Äôs type system supports model polymorphism and substitutability, and the definition of generic transformations that can be applied on models originating from different DSLs.