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Versions: (RFC 5892) 00 01 02 03 04 05 RFC 6452

Network Working Group                                  P. Faltstrom, Ed.
Internet-Draft                                                     Cisco
Intended status: Standards Track                        October 18, 2010
Expires: April 21, 2011


             The Unicode code points and IDNA - Unicode 6.0
                     draft-faltstrom-5892bis-00.txt

Abstract

   This document specifies updates Section 2.7 of RFC 5892 so that the
   calculation of the rules are backward compatible when Unicode 6.0 is
   released.

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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   Internet-Drafts are draft documents valid for a maximum of six months
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   time.  It is inappropriate to use Internet-Drafts as reference
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   This Internet-Draft will expire on April 21, 2011.

Copyright Notice

   Copyright (c) 2010 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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   described in the Simplified BSD License.





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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  New section 2.7 . . . . . . . . . . . . . . . . . . . . . . . . 3
     2.1.  BackwardCompatible (G)  . . . . . . . . . . . . . . . . . . 3
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 3
     3.1.  IDNA derived property value registry  . . . . . . . . . . . 3
   4.  Security Considerations . . . . . . . . . . . . . . . . . . . . 4
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . 4
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 4
     6.1.  Normative References  . . . . . . . . . . . . . . . . . . . 4
     6.2.  Informative References  . . . . . . . . . . . . . . . . . . 4
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . . . 4






































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1.  Introduction

   RFC 5892 [RFC5892] specifies an algorithm that based on The Unicode
   Standard [Unicode6] defines a derived property value.  Unicode 6.0
   have one codepoint that has changed GeneralCategory which implies the
   codepoint would move from PVALID to DISALLOWED.

   This document updates section 2.7 Backward Compatible and adds the
   codepoint U+19DA NEW TAI LUE THAM DIGIT ONE to it.

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].


2.  New section 2.7

   Between Unicode 5.2 and 6.0, three codepoints have changed in a non-
   compatible way.  U+0CF1 and U+0CF2 move from DISALLOWED to PVALID,
   and can be treated as codepoints that move from UNASSIGNED to PVALID.
   U+19DA moves from PVALID to DISALLOWED due to a change of
   GeneralCategory from Nd to No.  This new section 2.7 has added U+19DA
   for backward compatibility reasons.

2.1.  BackwardCompatible (G)

   G: cp is in {19DA}

   This category includes the code points that property values in
   versions of Unicode after 5.2 have changed in such a way that the
   derived property value would no longer be PVALID or DISALLOWED.  If
   changes are made to future versions of Unicode so that code points
   might change property value from PVALID or DISALLOWED, then this
   table can be updated and keep special exception values so that the
   property values for code points stay stable.

   PVALID -- Would otherwise have been DISALLOWED

   19DA; PVALID     # NEW TAI LUE THAM DIGIT ONE


3.  IANA Considerations

3.1.  IDNA derived property value registry

   IANA is to update the algorithm used for derived property value
   registry to reflect this change in the algorithm.




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4.  Security Considerations

   If algorithm presented in RFC 5892 [RFC5892] is applied to Unicode
   6.0 without adding the change described in this document, the
   codepoint U+19DA will have the wrong derived property value.  That in
   turn will make the codepoint DISALLOWED instead of PVALID.


5.  Acknowledgements

   The main contributors are (in alphabetical order) Eric Brunner-
   Williams, Vint Cerf, Tina Dam, Mark Davis, Paul Hoffman, John
   Klensin, Pete Resnick, Markus Scherer, Andrew Sullivan, Kenneth
   Whistler and Nicholas Williams.


6.  References

6.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC5892]  Faltstrom, P., "The Unicode Code Points and
              Internationalized Domain Names for Applications (IDNA)",
              RFC 5892, August 2010.

   [Unicode6]
              The Unicode Consortium, "The Unicode Standard, Version
              6.0.0", 2010.

6.2.  Informative References


Author's Address

   Patrik Faltstrom (editor)
   Cisco

   Email: paf@cisco.com











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