6452
PROPOSED STANDARD
The Unicode Code Points and Internationalized Domain Names for Applications (IDNA) - Unicode 6.0
Authors: P. Faltstrom, P. Hoffman
Date: November 2011
Area: app
Working Group: appsawg
Stream: IETF
Abstract
This memo documents IETF consensus for Internationalized Domain Names for Applications (IDNA) derived character properties related to the three code points, existing in Unicode 5.2, that changed property values when version 6.0 was released. The consensus is that no update is needed to RFC 5892 based on the changes made in Unicode 6.0. [STANDARDS-TRACK]
RFC 6452
PROPOSED STANDARD
Internet Engineering Task Force (IETF) P. Faltstrom, Ed.
Request for Comments: 6452 Cisco
Category: Standards Track P. Hoffman, Ed.
ISSN: 2070-1721 VPN Consortium
November 2011
<span class="h1">The Unicode Code Points and</span>
<span class="h1">Internationalized Domain Names for Applications (IDNA) - Unicode 6.0</span>
Abstract
This memo documents IETF consensus for Internationalized Domain Names
for Applications (IDNA) derived character properties related to the
three code points, existing in Unicode 5.2, that changed property
values when version 6.0 was released. The consensus is that no
update is needed to <a href="./rfc5892">RFC 5892</a> based on the changes made in Unicode
6.0.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in <a href="./rfc5741#section-2">Section 2 of RFC 5741</a>.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
<a href="https://www.rfc-editor.org/info/rfc6452">http://www.rfc-editor.org/info/rfc6452</a>.
Copyright Notice
Copyright (c) 2011 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to <a href="https://www.rfc-editor.org/bcp/bcp78">BCP 78</a> and the IETF Trust's Legal
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include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
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Table of Contents
<a href="#section-1">1</a>. Introduction ....................................................<a href="#page-2">2</a>
<a href="#section-1.1">1.1</a>. U+0CF1 KANNADA SIGN JIHVAMULIYA ............................<a href="#page-2">2</a>
<a href="#section-1.2">1.2</a>. U+0CF2 KANNADA SIGN UPADHMANIYA ............................<a href="#page-2">2</a>
<a href="#section-1.3">1.3</a>. U+19DA NEW TAI LUE THAM DIGIT ONE ..........................<a href="#page-2">2</a>
<a href="#section-2">2</a>. IETF Consensus ..................................................<a href="#page-2">2</a>
<a href="#section-3">3</a>. IANA Considerations .............................................<a href="#page-3">3</a>
<a href="#section-4">4</a>. Security Considerations .........................................<a href="#page-3">3</a>
<a href="#section-5">5</a>. Acknowledgements ................................................<a href="#page-3">3</a>
<a href="#section-6">6</a>. Normative References ............................................<a href="#page-3">3</a>
<span class="h2"><a class="selflink" id="section-1" href="#section-1">1</a>. Introduction</span>
<a href="./rfc5892">RFC 5892</a> [<a href="./rfc5892" title=""The Unicode Code Points and Internationalized Domain Names for Applications (IDNA)"">RFC5892</a>] specifies an algorithm that was defined when
version 5.0 (later updated to version 5.2) [<a href="#ref-Unicode5.2" title=""The Unicode Standard, Version 5.2.0"">Unicode5.2</a>] was the
current version of Unicode, and it also defines a derived property
value based on that algorithm. Unicode 6.0 [<a href="#ref-Unicode6" title=""The Unicode Standard, Version 6.0.0"">Unicode6</a>] has changed
GeneralCategory of three code points that were allocated in
Unicode 5.2 or earlier. This implies that the derived property value
differs depending on whether the property definitions used are from
Unicode 5.2 or 6.0. These are non-backward-compatible changes as
described in <a href="./rfc5892#section-5.1">Section 5.1 of RFC 5892</a>.
The three code points are:
<span class="h3"><a class="selflink" id="section-1.1" href="#section-1.1">1.1</a>. U+0CF1 KANNADA SIGN JIHVAMULIYA</span>
The GeneralCategory for this character changes from So to Lo. This
implies that the derived property value changes from DISALLOWED to
PVALID.
<span class="h3"><a class="selflink" id="section-1.2" href="#section-1.2">1.2</a>. U+0CF2 KANNADA SIGN UPADHMANIYA</span>
The GeneralCategory for this character changes from So to Lo. This
implies that the derived property value changes from DISALLOWED to
PVALID.
<span class="h3"><a class="selflink" id="section-1.3" href="#section-1.3">1.3</a>. U+19DA NEW TAI LUE THAM DIGIT ONE</span>
The GeneralCategory for this character changes from Nd to No. This
implies that the derived property value changes from PVALID to
DISALLOWED.
<span class="h2"><a class="selflink" id="section-2" href="#section-2">2</a>. IETF Consensus</span>
No change to <a href="./rfc5892">RFC 5892</a> is needed based on the changes made in
Unicode 6.0.
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This consensus does not imply that no changes will be made to
<a href="./rfc5892">RFC 5892</a> for all future updates of The Unicode Standard.
This RFC has been produced because 6.0 is the first version of
Unicode to be released since IDNA2008 was published.
<span class="h2"><a class="selflink" id="section-3" href="#section-3">3</a>. IANA Considerations</span>
IANA has updated the derived property value registry according to
<a href="./rfc5892">RFC 5892</a> and the property values defined in The Unicode Standard
version 6.0.
<span class="h2"><a class="selflink" id="section-4" href="#section-4">4</a>. Security Considerations</span>
When the algorithm presented in <a href="./rfc5892">RFC 5892</a> is applied using the
property definitions of Unicode Standard version 6.0, the result will
be different from when it is applied using the property definitions
of Unicode 5.2 for the three code points discussed in this document.
The three code points are unlikely to occur in internationalized
domain names, however, so the security implications of the changes
are minor.
<span class="h2"><a class="selflink" id="section-5" href="#section-5">5</a>. Acknowledgements</span>
The main contributors are (in alphabetical order) Eric Brunner-
Williams, Vint Cerf, Tina Dam, Mark Davis, Martin Duerst, John
Klensin, Pete Resnick, Markus Scherer, Andrew Sullivan, Kenneth
Whistler, and Nicholas Williams.
Not all contributors believe that the solution for the issues
discussed in this document is optimal.
<span class="h2"><a class="selflink" id="section-6" href="#section-6">6</a>. Normative References</span>
[<a id="ref-RFC5892">RFC5892</a>] Faltstrom, P., Ed., "The Unicode Code Points and
Internationalized Domain Names for Applications
(IDNA)", <a href="./rfc5892">RFC 5892</a>, August 2010.
[<a id="ref-Unicode5.2">Unicode5.2</a>] The Unicode Consortium, "The Unicode Standard,
Version 5.2.0", Unicode 5.0.0, Boston, MA,
Addison-Wesley ISBN 0-321-48091-0, as amended
by Unicode 5.2.0, October 2009,
<<a href="http://www.unicode.org/versions/Unicode5.2.0/">http://www.unicode.org/versions/Unicode5.2.0/</a>>.
[<a id="ref-Unicode6">Unicode6</a>] The Unicode Consortium, "The Unicode Standard,
Version 6.0.0", October 2010,
<<a href="http://www.unicode.org/versions/Unicode6.0.0/">http://www.unicode.org/versions/Unicode6.0.0/</a>>.
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Authors' Addresses
Patrik Faltstrom (editor)
Cisco
EMail: [email protected]
Paul Hoffman (editor)
VPN Consortium
EMail: [email protected]
Faltstrom & Hoffman Standards Track [Page 4]
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