Movatterモバイル変換

Internet Engineering Task Force (IETF)                       K. WhistlerRequest for Comments: 6082                                  Sybase, Inc.Obsoletes:2482                                                 G. AdamsCategory: Informational                              Skynav (Phil), Inc.ISSN: 2070-1721                                                M. Duerst                                                Aoyama Gakuin University                                                         R. Presuhn, Ed.                                                              J. Klensin                                                           November 2010Deprecating Unicode Language Tag Characters:RFC 2482 is HistoricAbstractRFC 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; seeSection 2 of RFC 5741.   Information about the current status of this document, any errata,   and how to provide feedback on it may be obtained athttp://www.rfc-editor.org/info/rfc6082.Whistler, et al.              Informational                     [Page 1]

RFC 6082RFC 2482 to Historic             November 2010Copyright Notice   Copyright (c) 2010 IETF Trust and the persons identified as the   document authors.  All rights reserved.   This document is subject toBCP 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 Contents1. Introduction ....................................................22. Action ..........................................................23. Security Considerations .........................................34. Acknowledgments .................................................35. References ......................................................35.1. Normative References .......................................35.2. Informative References .....................................31.  IntroductionRFC 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 inSection 16.9 of The Unicode Standard   [Unicode52].2.  ActionRFC 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 6082RFC 2482 to Historic             November 20103.  Security Considerations   By deprecatingRFC 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.  References5.1.  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 6082RFC 2482 to Historic             November 2010Authors' 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.comWhistler, et al.              Informational                     [Page 4]