ABNF

The augmented Backus–Naur form (ABNF) extends the Backus-Naur form. The augmented Backus–Naur form (ABNF) is based on Backus–Naur form (BNF), but consists of its own syntax and derivation rules. The motive principle for this metalanguage is to describe a formal system of a language which is a protocol (bidirectional specification). It is documented in RFC 4234 and often serves as the definition language for IETF communication protocol.
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ABNF (Augmented Backus-Naur form) est une extension du métalangage BNF, adaptée aux besoin de la normalisation sur Internet. ABNF est le langage standard à l'IETF pour décrire un langage dans les RFC.
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ASSOCIATION OF BLACK NURSING FACULTY IN HIGHER EDUCATION. ABNF

Augmented Backus Naur Form (RFC 2234)

Augmented Backus-Naur Form