Augmented Backus–Naur form
Metalanguage based on Backus–Naur Form (BNF) / From Wikipedia, the free encyclopedia
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In computer science, augmented Backus–Naur form (ABNF) is a metalanguage based on Backus–Naur form (BNF), but consisting of its own syntax and derivation rules. The motive principle for ABNF is to describe a formal system of a language to be used as a bidirectional communications protocol. It is defined by Internet Standard 68 ("STD 68", type case sic), which as of December 2010[update] is RFC 5234, and it often serves as the definition language for IETF communication protocols.[1][2]
RFC 5234 supersedes RFC 4234, 2234 and 733.[3] RFC 7405 updates it, adding a syntax for specifying case-sensitive string literals.