Wirth syntax notation

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What Wikipedia says

Wirth syntax notation (WSN) is a metasyntax, that is, a formal way to describe formal languages. Originally proposed by Niklaus Wirth in 1977 as an alternative to Backus–Naur form (BNF).

Excerpt from the Wikipedia article “Wirth syntax notation”, under the CC BY-SA 4.0 license. Read the article on Wikipedia