!!! Overview
[{$pagename}] ([BNF]) is one of the two main notation techniques for context-free grammars, often used to describe the syntax of languages used in computing, such as computer [programming] languages, document formats, instruction sets and communication [protocols].

Many extensions and variants of the original [{$pagename}] notation are used; some are exactly defined, including [Extended Backus–Naur Form] ([EBNF]) and [Augmented Backus–Naur Form] ([ABNF]).


The other main technique for writing context-free grammars is the van Wijngaarden form. They are applied wherever exact descriptions of languages are needed: for instance, in official language specifications, in manuals, and in textbooks on programming language theory.

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