'''Backus–Naur Form'''
(or sometimes expanded as ''Backus Normal Form'')
— a notation for describing the syntax of computer languages.

Technically, BNFs are capable of describing ''context-free languages'', which is often not quite enough powerful to describe actual computer languages, but they're so intuitive that people use them anyway, and bolt on what's missing as special cases and extra constraints.

See also:
   * [BNF for Tcl]
   * [RFC] 2234 - Augmented BNF for Syntax Specifications: ABNF [http://www.faqs.org/rfcs/rfc2234.html]

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