STD 68

RFC 5234

Augmented BNF for Syntax Specifications: ABNF, January 2008

Canonical URL:
https://www.rfc-editor.org/rfc/rfc5234.txt
File formats:
Plain TextPDF
Status:
INTERNET STANDARD
Obsoletes:
RFC 4234
Updated by:
RFC 7405
Authors:
D. Crocker, Ed.
P. Overell
Stream:
IETF
Source:
NON WORKING GROUP

Cite this RFC: TXT  |  XML

DOI:  http://dx.doi.org/10.17487/RFC5234

Discuss this RFC: Send questions or comments to iesg@ietf.org

Other actions: Find Errata (if any)  |  Submit Errata  |  Find IPR Disclosures from the IETF


Abstract

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. [STANDARDS-TRACK]


For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 4844.


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