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The sentence "Microsoft has its own MDE solution called DSL Tools" is disputable -- At first, MS's overall approach is called "Software factories", a development framework for software product lines, the DSL tools are just a part (though potentially the most important one) of this. Then, "Software factories" isn't promoted as a "model-first(-and-only)"-approach ... in this way, MS's DSLs aren't real modeling languages (in the sense that they don't systematically support underspecification, stepwise refinement, scaling etc.): I would coin them more generally as "visual specification languages" (allowing precise -- thus, executable -- specifications of domain tasks).
