BCP 47 Extension U
RFC 6067
Document | Type |
RFC - Informational
(December 2010; No errata)
Was draft-davis-u-langtag-ext (individual in app area)
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Authors | Yoshito Umaoka , Addison Phillips , Mark Davis | ||
Last updated | 2020-07-29 | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 6067 (Informational) | |
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Alexey Melnikov | ||
Send notices to | (None) |
Internet Engineering Task Force (IETF) M. Davis Request for Comments: 6067 Google Category: Informational A. Phillips ISSN: 2070-1721 Lab126 Y. Umaoka IBM December 2010 BCP 47 Extension U Abstract This document specifies an Extension to BCP 47 that provides subtags that specify language and/or locale-based behavior or refinements to language tags, according to work done by the Unicode Consortium. 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/rfc6067. 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. Davis, et al. Informational [Page 1] RFC 6067 BCP 47 Unicode Locale Extension December 2010 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.1. Requirements Language . . . . . . . . . . . . . . . . . . . 2 2. BCP 47 Required Information . . . . . . . . . . . . . . . . . . 2 2.1. Summary . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.1.1. Canonicalization . . . . . . . . . . . . . . . . . . . 5 2.2. Registration Form . . . . . . . . . . . . . . . . . . . . . 6 3. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 6 4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 6 5. Security Considerations . . . . . . . . . . . . . . . . . . . . 7 6. References . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6.1. Normative References . . . . . . . . . . . . . . . . . . . 7 6.2. Informative References . . . . . . . . . . . . . . . . . . 7 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 identifying Unicode locale-based variations using language tags. The "singleton" identifier for this extension is 'u'. 1.1. Requirements Language The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [RFC2119]. 2. BCP 47 Required Information Language tags, as defined by [BCP47], are useful for identifying the language of content. They are also used as locale identifiers (or can be mapped to locales) in many operating environments and APIs. However, many locale identifiers also require additional "tailorings" or options for specific values within a language, culture, region, or other variation. This extension provides a mechanism for using these additional tailorings within language tags for general interchange. The Unicode Consortium defines a standardized, structured set of locale data and identifiers for locale data in the "Common Locale Data Repository" or "CLDR". The maintaining authority for the extension defined by this document is the Unicode Consortium: Davis, et al. Informational [Page 2] RFC 6067 BCP 47 Unicode Locale Extension December 2010 +---------------+---------------------------------------------------+ | Item | Value | +---------------+---------------------------------------------------+Show full document text