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RFC 5234, "Augmented BNF for Syntax Specifications: ABNF", January 2008

Note: This RFC has been updated by RFC 7405

Source of RFC: IETF - NON WORKING GROUP
Area Assignment: app

Errata ID: 2914
Status: Held for Document Update
Type: Editorial
Publication Format(s) : TEXT
Reported By: Rudolf Dovicin
Date Reported: 2011-08-03
Held for Document Update by: Pete Resnick
Date Held: 2011-08-04

Throughout the document, when it says: 

         alternation    =  concatenation
                           *(*c-wsp "/" *c-wsp concatenation)

         concatenation  =  repetition *(1*c-wsp repetition)

         repetition     =  [repeat] element

         repeat         =  1*DIGIT / (*DIGIT "*" *DIGIT)

         element        =  rulename / group / option /
                           char-val / num-val / prose-val

         group          =  "(" *c-wsp alternation *c-wsp ")"

         option         =  "[" *c-wsp alternation *c-wsp "]"

Notes:

Section 4. (ABNF Definition of ABNF) contains at least 2 recursions.
Recursions are not explicitly mentioned in the document, which may be confusing.

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