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Martin Fowler posts a lot about DSLs these days. In a recent post about ParserFear, he comments on an apparently typical reaction against creating one's own DSLs. That reaction seems to be that parsers are hard to write, and that it's easier to use XML instead because with XML, you get the parser for free. Martin Fowler then continues to explain why in his experience, parsers are not hard to implement, by contrasting a specific XML case with an alternative design using Antlr.