(Sorry for the cross-posting, but I can't think of a single-best list to post
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Subject: STD 68, RFC 5234 on Augmented BNF for Syntax Specifications: ABNF
Date: Thu, 31 Jan 2008 17:24:14 -0800 (PST)
To: ietf-announce(_at_)ietf(_dot_)org, rfc-dist(_at_)rfc-editor(_dot_)org
A new Request for Comments is now available in online RFC libraries.
Title: Augmented BNF for Syntax Specifications:
Author: D. Crocker, Ed.,
Status: Standards Track
Date: January 2008
See Also: STD0068
I-D Tag: draft-crocker-rfc4234bis-01.txt
Internet technical specifications often need to define a formal
syntax. Over the years, a modified version of Backus-Naur Form
(BNF), called Augmented BNF (ABNF), has been popular among many
Internet specifications. The current specification documents ABNF.
It balances compactness and simplicity with reasonable
representational power. The differences between standard BNF and
ABNF involve naming rules, repetition, alternatives,
order-independence, and value ranges. This specification also
supplies additional rule definitions and encoding for a core lexical
analyzer of the type common to several Internet specifications.
This is now a Standard Protocol.