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Augmented Backus–Naur Form : ウィキペディア英語版
Augmented Backus–Naur Form
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 is RFC 5234, and it often serves as the definition language for IETF communication protocols.〔
〕〔

RFC 5234 supersedes RFC 4234 (which superseded RFC 2234 and RFC 733).〔
〕 RFC 7405 updates it, adding a syntax for specifying case-sensitive string literals.
==Introduction==

An ABNF specification is a set of derivation rules, written as
rule = definition ; comment CR LF
where rule is a case-insensitive nonterminal, the definition consists of sequences of symbols that define the rule, a comment for documentation, and ending with a carriage return and line feed.
Rule names are case insensitive: , , , and all refer to the same rule. Rule names consist of a letter followed by letters, numbers, and hyphens.
Angle brackets (“<”, “>”) are not required around rule names (as they are in BNF). However they may be used to delimit a rule name when used in prose to discern a rule name.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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