PRECIS Framework: Preparation, Enforcement, and Comparison of Internationalized Strings in Application Protocols
draft-ietf-precis-7564bis-10

Document Type Active Internet-Draft (precis WG)
Last updated 2017-08-01 (latest revision 2017-07-25)
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Stream WG state Submitted to IESG for Publication (wg milestone: Jun 2016 - New version of RFC 7... )
Document shepherd Marc Blanchet
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Responsible AD Alexey Melnikov
Send notices to Marc Blanchet <Marc.Blanchet@viagenie.ca>
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Network Working Group                                     P. Saint-Andre
Internet-Draft                                                  Filament
Obsoletes: 7564 (if approved)                                M. Blanchet
Intended status: Standards Track                                Viagenie
Expires: January 26, 2018                                  July 25, 2017

     PRECIS Framework: Preparation, Enforcement, and Comparison of
           Internationalized Strings in Application Protocols
                      draft-ietf-precis-7564bis-10

Abstract

   Application protocols using Unicode code points in protocol strings
   need to properly handle such strings in order to enforce
   internationalization rules for strings placed in various protocol
   slots (such as addresses and identifiers) and to perform valid
   comparison operations (e.g., for purposes of authentication or
   authorization).  This document defines a framework enabling
   application protocols to perform the preparation, enforcement, and
   comparison of internationalized strings ("PRECIS") in a way that
   depends on the properties of Unicode code points and thus is more
   agile with respect to versions of Unicode.  As a result, this
   framework provides a more sustainable approach to the handling of
   internationalized strings than the previous framework, known as
   Stringprep (RFC 3454).  This document obsoletes RFC 7564.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on January 26, 2018.

Saint-Andre & Blanchet  Expires January 26, 2018                [Page 1]
Internet-Draft              PRECIS Framework                   July 2017

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   6
   3.  Preparation, Enforcement, and Comparison  . . . . . . . . . .   7
   4.  String Classes  . . . . . . . . . . . . . . . . . . . . . . .   8
     4.1.  Overview  . . . . . . . . . . . . . . . . . . . . . . . .   8
     4.2.  IdentifierClass . . . . . . . . . . . . . . . . . . . . .   9
       4.2.1.  Valid . . . . . . . . . . . . . . . . . . . . . . . .   9
       4.2.2.  Contextual Rule Required  . . . . . . . . . . . . . .  10
       4.2.3.  Disallowed  . . . . . . . . . . . . . . . . . . . . .  10
       4.2.4.  Unassigned  . . . . . . . . . . . . . . . . . . . . .  11
       4.2.5.  Examples  . . . . . . . . . . . . . . . . . . . . . .  11
     4.3.  FreeformClass . . . . . . . . . . . . . . . . . . . . . .  11
       4.3.1.  Valid . . . . . . . . . . . . . . . . . . . . . . . .  11
       4.3.2.  Contextual Rule Required  . . . . . . . . . . . . . .  12
       4.3.3.  Disallowed  . . . . . . . . . . . . . . . . . . . . .  12
       4.3.4.  Unassigned  . . . . . . . . . . . . . . . . . . . . .  12
       4.3.5.  Examples  . . . . . . . . . . . . . . . . . . . . . .  12
     4.4.  Summary . . . . . . . . . . . . . . . . . . . . . . . . .  13
   5.  Profiles  . . . . . . . . . . . . . . . . . . . . . . . . . .  15
     5.1.  Profiles Must Not Be Multiplied beyond Necessity  . . . .  15
     5.2.  Rules . . . . . . . . . . . . . . . . . . . . . . . . . .  16
       5.2.1.  Width Mapping Rule  . . . . . . . . . . . . . . . . .  16
       5.2.2.  Additional Mapping Rule . . . . . . . . . . . . . . .  16
       5.2.3.  Case Mapping Rule . . . . . . . . . . . . . . . . . .  17
       5.2.4.  Normalization Rule  . . . . . . . . . . . . . . . . .  17
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