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A metasyntax describes the allowable structure and composition of phrases and sentences of a metalanguage, which is used to describe either a natural language or a computer programming language.

Some of the widely used formal metalanguages for computer languages are Backus – Naur Form ( BNF ), Extended Backus – Naur Form ( EBNF ), Wirth syntax notation ( WSN ), and Augmented Backus – Naur Form ( ABNF ).