Network Working Group K. Whistler
Internet-Draft Sybase, Inc.
Obsoletes: 2482 (if approved) G. Adams
Intended status: Informational Skynav (Phil), Inc.
Expires: January 8, 2011 M. Duerst
Aoyama Gakuin University
R. Presuhn, Ed.
J. Klensin
July 7, 2010
Deprecating Unicode Language Tag Characters: RFC 2482 is Historic
draft-presuhn-rfc2482-historic-02.txt
Abstract
RFC 2482, Language Tagging in Unicode Plain Text, described a
mechanism for using special Unicode language tag characters to
identify languages when needed without more general markup such as
that provided by XML. The Unicode Consortium has deprecated that
facility and strongly recommends against its use. RFC 2482 should be
moved to Historic to reduce the possibility that Internet
implementers would consider that system an appropriate mechanism for
identifying languages.
Status of this Memo
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provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on January 8, 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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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Action . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 3
4. Security Considerations . . . . . . . . . . . . . . . . . . . . 3
5. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 3
6. References . . . . . . . . . . . . . . . . . . . . . . . . . . 4
6.1. Normative References . . . . . . . . . . . . . . . . . . . 4
6.2. Informative References . . . . . . . . . . . . . . . . . . 4
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 4
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1. Introduction
RFC 2482, Language Tagging in Unicode Plain Text [RFC2482], described
a mechanism for using special Unicode language tag characters to
identify languages when needed. It was an idea whose time never
quite came. It has been superseded by whole-transaction language
identification such as the MIME Content-language header [RFC3282] and
more general markup mechanisms such as those provided by XML. The
Unicode Consortium has deprecated the language tag character facility
and strongly recommends against its use. RFC 2482 should be moved to
Historic to reduce the possibility that Internet implementers would
consider that tagging system an appropriate mechanism for identifying
languages.
A discussion of the status of the language tag characters and their
applicability appears in Section 16.9 of the Unicode Standard
[Unicode52].
2. Action
RFC 2482 is deprecated and reclassified as Historic. Internet
protocols and Standards-track documents should not use the facilities
described in that document.
3. IANA Considerations
[RFC Editor: Please remove this section before publication.]
This memo includes no requests to or actions for IANA.
4. Security Considerations
By deprecating RFC 2482, we eliminate a facility that is no longer
encouraged and supported by the Unicode Consortium and that may have
been slightly risky in use if misinterpreted or if expectations of
support were not met. So, if this action has any effect on Internet
security at all, it should be positive.
5. Acknowledgments
Helpful comments were received from Peter Koch and S. Moonesamy.
6. References
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6.1. Normative References
[RFC2482] Whistler, K. and G. Adams, "Language Tagging in Unicode
Plain Text", RFC 2482, January 1999.
[Unicode52]
The Unicode Consortium. The Unicode Standard, Version
5.2.0, defined by:, "The Unicode Standard, Version 5.2.0",
(Mountain View, CA: The Unicode Consortium, 2009. ISBN
978-1-936213-00-9).,
<http://www.unicode.org/versions/Unicode5.2.0/>.
6.2. Informative References
[RFC3282] Alvestrand, H., "Content Language Headers", RFC 3282,
May 2002.
Authors' Addresses
Kenneth Whistler
Sybase, Inc.
One Sybase Dr.
Dublin, CA 94568
USA
Phone: +1 925 236 7429
Email: kenw@sybase.com
Glenn Adams
Skynav (Phil), Inc.
Lot 14 Boton Area
Subic Bay Freeport Zone 2222
Philippines
Phone:
Email: glenn@skynav.com
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Martin Duerst
Aoyama Gakuin University
5-10-1 Fuchinobe
Sagamihara, Kanagawa 229-8558
Japan
Phone: +81 42 759 6329
Fax: +81 42 759 6495
Email: duerst@it.aoyama.ac.jp
Randy Presuhn (editor)
San Jose, CA 95120
USA
Phone:
Email: randy_presuhn@mindspring.com
John C Klensin
1770 Massachusetts Ave, Ste 322
Cambridge, MA 02140
USA
Phone: +1 617 245 1457
Email: john+ietf@jck.com
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