I-D ACTION:draft-ietf-drums-abnf-03.txt

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 A Revised Internet-Draft is available from the on-line Internet-Drafts 
 directories. This draft is a work item of the Detailed Revision/Update of 
 Message Standards Working Group of the IETF.                              

       Title     : Augmented BNF for Syntax Specifications: ABNF           
       Author(s) : D. Crocker, P. Overell
       Filename  : draft-ietf-drums-abnf-03.txt
       Pages     : 9
       Date      : 07/21/1997

Internet technical specifications often need to define a format syntax and 
are free to employ whatever notation their authors deem useful.  Over the 
years, a modified version of Backus-Naur Form (BNF), called Augmented BNF 
(ABNF), has been popular among many Internet specifications.  It balances 
compactness and simplicity, with reasonable representational power.  In the
early days of the Arpanet, each specification contained its own definition 
of ABNF.  This included the email specifications, RFC733 and then RFC822 
which have come to be the common citations for defining ABNF.  The current 
document separates out that definition, to permit selective reference.  
Predictably, it also provides some enhancements.                           

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