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Mapping Characters for Classes of the Preparation, Enforcement, and Comparison of Internationalized Strings (PRECIS) (RFC7790) Disclosure Number: IPCOM000245332D
Original Publication Date: 2016-Feb-01
Included in the Prior Art Database: 2016-Mar-01
Document File: 20 page(s) / 21K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

Y. Yoneya: AUTHOR [+1]


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.

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This is the abbreviated version, containing approximately 13% of the total text.

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)


   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

 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:...