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  1. The van Wijngaarden grammars: A syntax primer with decidable restrictions.Luis M. Augusto - 2023 - Journal of Knowledge Structures and Systems 4 (2):1-39.
    Expressiveness and decidability are two core aspects of programming languages that should be thoroughly known by those who use them; this includes knowledge of their metalanguages a.k.a. formal grammars. The van Wijngaarden grammars (WGs) are capable of generating all the languages in the Chomsky hierarchy and beyond; this makes them a relevant tool in the design of (more) expressive programming languages. But this expressiveness comes at a very high cost: The syntax of WGs is extremely complex and the decision problem (...)
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