PRECIS Framework: Handling Internationalized Strings in Protocols
draft-ietf-precis-framework-01

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Document Type Active Internet-Draft (precis WG)
Last updated 2011-10-04 (latest revision 2011-08-22)
Replaces draft-blanchet-precis-framework
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Network Working Group                                        M. Blanchet
Internet-Draft                                                  Viagenie
Obsoletes: 3454 (if approved)                             P. Saint-Andre
Intended status: Standards Track                                   Cisco
Expires: May 2, 2012                                    October 30, 2011

   PRECIS Framework: Handling Internationalized Strings in Protocols
                     draft-ietf-precis-framework-01

Abstract

   Application protocols that make use of Unicode code points in
   protocol strings need to prepare such strings in order to perform
   comparison operations (e.g., for purposes of authentication or
   authorization).  In general, this problem has been labeled the
   "preparation and comparison of internationalized strings" or
   "PRECIS".  This document defines a framework that enables application
   protocols to prepare various classes of strings in a way that depends
   on the properties of Unicode code points.  Because this framework
   does not depend on large tables of Unicode code points as in
   stringprep (RFC 3454), it is more agile with regard to changes in the
   underlying Unicode database and thus provides improved flexibility to
   application protocols.  A specification that uses this framework
   either can directly use the base string classes defined in this
   document or can subclass the base string classes as needed.  This
   framework uses an approach similar to that of the revised
   internationalized domain names in applications (IDNA) technology (RFC
   5890, RFC 5891, RFC 5892, RFC 5893, RFC 5894) and thus adheres to the
   high-level design goals described in RFC 4690, albeit for application
   technologies other than the Domain Name System (DNS).  This document
   obsoletes RFC 3454.

Status of this Memo

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

   Internet-Drafts are working documents of the Internet Engineering
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Blanchet & Saint-Andre     Expires May 2, 2012                  [Page 1]
Internet-Draft              PRECIS Framework                October 2011

   This Internet-Draft will expire on May 2, 2012.

Copyright Notice

   Copyright (c) 2011 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
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Blanchet & Saint-Andre     Expires May 2, 2012                  [Page 2]
Internet-Draft              PRECIS Framework                October 2011

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  5
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  6
   3.  String Classes . . . . . . . . . . . . . . . . . . . . . . . .  6
     3.1.  NameClass  . . . . . . . . . . . . . . . . . . . . . . . .  7
       3.1.1.  Valid  . . . . . . . . . . . . . . . . . . . . . . . .  7
       3.1.2.  Disallowed . . . . . . . . . . . . . . . . . . . . . .  8
       3.1.3.  Unassigned . . . . . . . . . . . . . . . . . . . . . .  8
       3.1.4.  Directionality . . . . . . . . . . . . . . . . . . . .  8
       3.1.5.  Case Mapping . . . . . . . . . . . . . . . . . . . . .  8
       3.1.6.  Normalization  . . . . . . . . . . . . . . . . . . . .  8
     3.2.  FreeClass  . . . . . . . . . . . . . . . . . . . . . . . .  8
       3.2.1.  Valid  . . . . . . . . . . . . . . . . . . . . . . . .  9
       3.2.2.  Disallowed . . . . . . . . . . . . . . . . . . . . . .  9
       3.2.3.  Unassigned . . . . . . . . . . . . . . . . . . . . . .  9
       3.2.4.  Directionality . . . . . . . . . . . . . . . . . . . .  9
       3.2.5.  Case Mapping . . . . . . . . . . . . . . . . . . . . .  9
       3.2.6.  Normalization  . . . . . . . . . . . . . . . . . . . . 10
   4.  Use of PRECIS String Classes . . . . . . . . . . . . . . . . . 10
     4.1.  Principles . . . . . . . . . . . . . . . . . . . . . . . . 10
     4.2.  Subclassing  . . . . . . . . . . . . . . . . . . . . . . . 10
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