Mapping Characters for Classes of the Preparation, Enforcement, and Comparison of Internationalized Strings (PRECIS)
RFC 7790
Document | Type | RFC - Informational (February 2016; No errata) | |
---|---|---|---|
Authors | Yoshiro Yoneya , Takahiro Nemoto | ||
Last updated | 2016-02-29 | ||
Replaces | draft-yoneya-precis-mappings | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Reviews | |||
Stream | WG state | Submitted to IESG for Publication | |
Document shepherd | Peter Saint-Andre | ||
Shepherd write-up | Show (last changed 2015-07-20) | ||
IESG | IESG state | RFC 7790 (Informational) | |
Action Holders |
(None)
|
||
Consensus Boilerplate | Yes | ||
Telechat date | |||
Responsible AD | Barry Leiba | ||
Send notices to | (None) | ||
IANA | IANA review state | Version Changed - Review Needed | |
IANA action state | No IANA Actions |
Internet Engineering Task Force (IETF) Y. Yoneya Request for Comments: 7790 JPRS Category: Informational T. Nemoto ISSN: 2070-1721 Keio University February 2016 Mapping Characters for Classes of the Preparation, Enforcement, and Comparison of Internationalized Strings (PRECIS) Abstract The framework for the preparation, enforcement, and comparison of internationalized strings (PRECIS) defines several classes of strings for use in application protocols. Because many protocols perform case-sensitive or case-insensitive string comparison, it is necessary to define methods for case mapping. In addition, both the Internationalized Domain Names in Applications (IDNA) and the PRECIS problem statement describe mappings for internationalized strings that are not limited to case, but include width mapping and mapping of delimiters and other special characters that can be taken into consideration. This document provides guidelines for designers of PRECIS profiles and describes several mappings that can be applied between receiving user input and passing permitted code points to internationalized protocols. In particular, this document describes both locale-dependent and context-depending case mappings as well as additional mappings for delimiters and special characters. 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/rfc7790. Yoneya & Nemoto Informational [Page 1] RFC 7790 PRECIS Mapping February 2016 Copyright Notice Copyright (c) 2016 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. Protocol-Dependent Mappings . . . . . . . . . . . . . . . . . 3 2.1. Delimiter Mapping . . . . . . . . . . . . . . . . . . . . 3 2.2. Special Mapping . . . . . . . . . . . . . . . . . . . . . 4 2.3. Local Case Mapping . . . . . . . . . . . . . . . . . . . 4 3. Order of Operations . . . . . . . . . . . . . . . . . . . . . 5 4. Security Considerations . . . . . . . . . . . . . . . . . . . 5 5. References . . . . . . . . . . . . . . . . . . . . . . . . . 6 5.1. Normative References . . . . . . . . . . . . . . . . . . 6 5.2. Informative References . . . . . . . . . . . . . . . . . 6 Appendix A. Mapping Type List . . . . . . . . . . . . . . . . . 8 A.1. Mapping Type List for Each Protocol . . . . . . . . . . . 8 Appendix B. Why Local Case Mapping Is an Alternative to Case Mapping in the PRECIS Framework . . . . . . . . . . 8 Appendix C. Limitations of Local Case Mapping . . . . . . . . . 9 Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 9 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 10 1. Introduction In many cases, user input of internationalized strings is generated through the use of an input method editor ("IME") or through copy- and-paste from free text. Users generally do not care about the case and/or width of input characters because they consider those characters to be functionally equivalent or visually identical. Furthermore, users rarely switch the IME state to input special characters such as protocol elements. Yoneya & Nemoto Informational [Page 2] RFC 7790 PRECIS Mapping February 2016 For Internationalized Domain Names (IDNs), the IDNA MappingShow full document text