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rfc:rfc6082

Internet Engineering Task Force (IETF) K. Whistler Request for Comments: 6082 Sybase, Inc. Obsoletes: 2482 G. Adams Category: Informational Skynav (Phil), Inc. ISSN: 2070-1721 M. Duerst

                                              Aoyama Gakuin University
                                                       R. Presuhn, Ed.
                                                            J. Klensin
                                                         November 2010
 Deprecating Unicode Language Tag Characters: RFC 2482 is Historic

Abstract

 RFC 2482, "Language Tagging in Unicode Plain Text", describes 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 has been
 moved to Historic status to reduce the possibility that Internet
 implementers would consider that system an appropriate mechanism for
 identifying languages.

Status of This Memo

 This document is not an Internet Standards Track specification; it is
 published for informational purposes.
 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).  Not all documents
 approved by the IESG are a candidate for any level of Internet
 Standard; see Section 2 of RFC 5741.
 Information about the current status of this document, any errata,
 and how to provide feedback on it may be obtained at
 http://www.rfc-editor.org/info/rfc6082.

Whistler, et al. Informational [Page 1] RFC 6082 RFC 2482 to Historic November 2010

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
 Provisions Relating to IETF Documents
 (http://trustee.ietf.org/license-info) in effect on the date of
 publication of this document.  Please review these documents
 carefully, as they describe your rights and restrictions with respect
 to this document.  Code Components extracted from this document must
 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.

Table of Contents

 1. Introduction ....................................................2
 2. Action ..........................................................2
 3. Security Considerations .........................................3
 4. Acknowledgments .................................................3
 5. References ......................................................3
    5.1. Normative References .......................................3
    5.2. Informative References .....................................3

1. Introduction

 RFC 2482, "Language Tagging in Unicode Plain Text" [RFC2482],
 describes a mechanism for using special Unicode language tag
 characters to identify languages when needed.  It is 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
 has been moved to Historic status 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 has been deprecated and reclassified as Historic.  Internet
 protocols and Standards-Track documents should not use the facilities
 described in that document.

Whistler, et al. Informational [Page 2] RFC 6082 RFC 2482 to Historic November 2010

3. Security Considerations

 By deprecating RFC 2482, we eliminate a facility that is no longer
 encouraged or 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.

4. Acknowledgments

 Helpful comments were received from Peter Koch and S. Moonesamy.

5. References

5.1. 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/>.

5.2. Informative References

 [RFC3282]    Alvestrand, H., "Content Language Headers", RFC 3282,
              May 2002.

Whistler, et al. Informational [Page 3] RFC 6082 RFC 2482 to Historic November 2010

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
 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

Whistler, et al. Informational [Page 4]

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