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Compiler Description Language (CDL) is a programming language based on affix grammars. It is very similar to Backus–Naur form (BNF) notation. It was designed for the development of compilers. It is very limited in its capabilities and control flow, and intentionally so. The benefits of these limitations are twofold. CDL3 is the third version of the CDL language, significantly different from the previous two versions.