MPS sounds more like some kind of equivalent to Xtext, i.e. for ease of producing and and hosting DSLs. Tools like Xtext and MPS actually tie you in to their ho

MPS sounds more like some kind of equivalent to Xtext, i.e. for ease of producing and and hosting DSLs. Tools like Xtext and MPS actually tie you in to their host environments (Eclipse and IntelliJ respectively). What I took GP to mean, and indeed what Yegge's Grok appears to aim for, is the need for a universal modelling framework 'standard' for languages, tools and runtimes. Some kind of equivalent to LLVM but in the 'other direction' for modelling language semantics instead of code. Once a tool (e.g. editor) implements that standard it is able to 'plug in' to any tooling that also implements the standard. Potentially eliminating huge amounts of duplicated effort for tool makers etc.