Alex Shatalin and Václav Pech hold a hands on demonstration on using JetBrains MPS to generate a new language, including version control, debugging, testing, refactoring, etc.
Alex Shatalin is the JetBrains MPS project lead. Before JetBrains, Alex worked at Borland Together, for Eclipse Graphical Modeling Framework development, and in various other MDA/DSL-based application development projects. Václav Pech works for JetBrains as a senior software developer and a technology evangelist. More at http://vaclavpech.eu
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In other words I have an informed viewpoint. Your code (text) representation needs to look like word-processor (errors are like a spellchecker). The abstract representation should not be a syntax tree, the abstraction needs to reside in the problem (or the solution) domain. I (think) that you can use MPS to make models of 'solution domains' and in that respect this is a great step forward (when people do that). However, what I think we get with a tool for DSL-s will be something similar to FORTH and Smalltalk wherein we actually have a tower of babel within implementation environments.
I reckon MPS is going towards the right orientation, and I'd like to suggest considering an alternative 'direction' (if you like) and reflect on open, generative systems like MUDD-s (or game like environments). And remember the 'spell checker' idea!