BCP 47 Extension T - Transformed Content
RFC 6497

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Internet Engineering Task Force (IETF)                          M. Davis
Request for Comments: 6497                                        Google
Category: Informational                                      A. Phillips
ISSN: 2070-1721                                                   Lab126
                                                               Y. Umaoka
                                                                     IBM
                                                                 C. Falk
                                                       Infinite Automata
                                                           February 2012

                BCP 47 Extension T - Transformed Content

Abstract

   This document specifies an Extension to BCP 47 that provides subtags
   for specifying the source language or script of transformed content,
   including content that has been transliterated, transcribed, or
   translated, or in some other way influenced by the source.  It also
   provides for additional information used for identification.

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/rfc6497.

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RFC 6497                   BCP 47 Extension T              February 2012

Copyright Notice

   Copyright (c) 2012 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
      1.1. Requirements Language ......................................4
   2. BCP 47 Required Information .....................................4
      2.1. Overview ...................................................4
      2.2. Structure ..................................................6
      2.3. Canonicalization ...........................................7
      2.4. BCP 47 Registration Form ...................................8
      2.5. Field Definitions ..........................................8
      2.6. Registration of Field Subtags .............................10
      2.7. Registration of Additional Fields .........................11
      2.8. Committee Responses to Registration Proposals .............11
      2.9. Machine-Readable Data .....................................11
   3. Acknowledgements ...............................................14
   4. IANA Considerations ............................................14
   5. Security Considerations ........................................14
   6. References .....................................................14
      6.1. Normative References ......................................14
      6.2. Informative References ....................................15

1.  Introduction

   [BCP47] permits the definition and registration of language tag
   extensions "that contain a language component and are compatible with
   applications that understand language tags".  This document defines
   an extension for specifying the source of content that has been
   transformed, including text that has been transliterated,
   transcribed, or translated, or in some other way influenced by the
   source.  It may be used in queries to request content that has been
   transformed.  The "singleton" identifier for this extension is 't'.

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RFC 6497                   BCP 47 Extension T              February 2012

   Language tags, as defined by [BCP47], are useful for identifying the
   language of content.  There are mechanisms for specifying variant
   subtags for special purposes.  However, these variants are
   insufficient for specifying content that has undergone
   transformations, including content that has been transliterated,