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Network Working Group                                         S. Leonard
Internet-Draft                                             Penango, Inc.
Updates: 5234 (if approved)                               April 15, 2015
Intended Status: Standards Track
Expires: October 17, 2015

                   Comprehensive Core Rules for ABNF


   This document extends the base definition of ABNF (Augmented Backus-
   Naur Form) to include comprehensive support for certain symbols,
   namely those in the US-ASCII standard.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on October 17, 2015.

Copyright Notice

   Copyright (c) 2015 IETF Trust and the persons identified as the
   document authors. All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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1.  Comprehensive Core Rule Update

   Augmented Backus-Naur Form (ABNF) [RFC5234] is a formal syntax that
   is popular among many Internet specifications. Many Internet
   documents employ this syntax along with the Core Rules defined in
   Appendix B.1 of [RFC5234]. However, the Core Rules do not specify
   many symbols in the US-ASCII range that are also needed by these
   relying documents, forcing document authors to define them as local
   rules. Sometimes different documents define these common symbols in
   different ways, resulting in confusion or incompatibility when the
   rules are misread or are combined with other sets of rules. This
   document extends the [RFC5234] to include comprehensive support for
   certain symbols, namely those in [US-ASCII].

   Appendix A of this document is meant as a drop-in replacement for
   Appendix B.1 of [RFC5234]. I.e., these Core Rules are no more or less
   useful or normative than those in [RFC5234]. Future document authors
   should use these rules, and should not attempt to redefine or augment
   them (except for backwards compatibility with prior documents).

2.  IANA Considerations

   This document implies no IANA considerations.

3.  Security Considerations

   Security is truly believed to be irrelevant to this document.

4.  Normative References

   [US-ASCII] American National Standards Institute, "Coded Character
              Set -- 7-bit American Standard Code for Information
              Interchange", ANSI X3.4, 1986.

   [RFC5234]  Crocker, D. and P. Overell, "Augmented BNF for Syntax
              Specifications: ABNF", STD 68, RFC 5234, January 2008.

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Appendix A.  Comprehensive Core Rules

   Certain basic rules are in uppercase, such as SP, HTAB, CRLF, DIGIT,
   ALPHA, etc.

         ALPHA          =  %x41-5A / %x61-7A   ; A-Z / a-z

         BIT            =  "0" / "1"

         CHAR           =  %x01-7F
                                ; any 7-bit US-ASCII character,
                                ;  excluding NUL

         CR             =  %x0D
                                ; carriage return

         CRLF           =  CR LF
                                ; Internet standard newline

         CTL            =  %x00-1F / %x7F
                                ; controls

         DIGIT          =  %x30-39
                                ; 0-9

         DQUOTE         =  %x22
                                ; " (Double Quote)

         HEXDIG         =  DIGIT / "A" / "B" / "C" / "D" / "E" / "F"

         HTAB           =  %x09
                                ; horizontal tab

         LF             =  %x0A
                                ; linefeed

         LWSP           =  *(WSP / CRLF WSP)
                                ; Use of this linear-white-space rule
                                ;  permits lines containing only white
                                ;  space that are no longer legal in
                                ;  mail headers and have caused
                                ;  interoperability problems in other
                                ;  contexts.
                                ; Do not use when defining mail
                                ;  headers and use with caution in
                                ;  other contexts.

         OCTET          =  %x00-FF

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                                ; 8 bits of data

         SP             =  %x20

         VCHAR          =  %x21-7E
                                ; visible (printing) characters

         WSP            =  SP / HTAB
                                ; white space

         NUL            =  %d0
         SOH            =  %d1
         STX            =  %d2
         ETX            =  %d3
         EOT            =  %d4
         ENQ            =  %d5
         ACK            =  %d6
         BEL            =  %d7
         BS             =  %d8
         HT             =  %d9   ; also defined as HTAB
         ; LF           =  %d10  ; already defined
         VT             =  %d11
         FF             =  %d12  ; (literally used in every RFC)
         ; CR           =  %d13  ; already defined
         SO             =  %d14
         SI             =  %d15
         DLE            =  %d16
         DC1            =  %d17
         DC2            =  %d18
         DC3            =  %d19
         DC4            =  %d20
         NAK            =  %d21
         SYN            =  %d22
         ETB            =  %d23
         CAN            =  %d24
         EM             =  %d25
         SUB            =  %d26
         ESC            =  %d27
         FS             =  %d28
         GS             =  %d29
         RS             =  %d30
         US             =  %d31
         ; SP           =  %d32  ; already defined
         DEL            =  %d127

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Author's Address

   Sean Leonard
   Penango, Inc.
   5900 Wilshire Boulevard
   21st Floor
   Los Angeles, CA  90036

   EMail: dev+ietf@seantek.com
   URI:   http://www.penango.com/

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