PRECIS Framework: Preparation and Comparison of Internationalized Strings in Application Protocols
draft-ietf-precis-framework-06

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Document Type Active Internet-Draft (precis WG)
Last updated 2012-09-23
Replaces draft-blanchet-precis-framework
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PRECIS                                                    P. Saint-Andre
Internet-Draft                                       Cisco Systems, Inc.
Obsoletes: 3454 (if approved)                                M. Blanchet
Intended status: Standards Track                                Viagenie
Expires: March 27, 2013                               September 23, 2012

   PRECIS Framework: Preparation and Comparison of Internationalized
                    Strings in Application Protocols
                     draft-ietf-precis-framework-06

Abstract

   Application protocols using 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).
   This document defines a framework enabling application protocols to
   perform the preparation and comparison of internationalized strings
   (a.k.a.  "PRECIS") in a way that depends on the properties of Unicode
   code points and thus is 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).  A specification that
   reuses this framework can either directly use the base string classes
   or subclass the base string classes as needed.  This framework takes
   an approach similar to 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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   This Internet-Draft will expire on March 27, 2013.

Saint-Andre & Blanchet   Expires March 27, 2013                 [Page 1]
Internet-Draft              PRECIS Framework              September 2012

Copyright Notice

   Copyright (c) 2012 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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  5
   3.  String Classes . . . . . . . . . . . . . . . . . . . . . . . .  5
     3.1.  Overview . . . . . . . . . . . . . . . . . . . . . . . . .  5
     3.2.  NameClass  . . . . . . . . . . . . . . . . . . . . . . . .  7
       3.2.1.  Valid  . . . . . . . . . . . . . . . . . . . . . . . .  7
       3.2.2.  Disallowed . . . . . . . . . . . . . . . . . . . . . .  8
       3.2.3.  Unassigned . . . . . . . . . . . . . . . . . . . . . .  8
       3.2.4.  Normalization  . . . . . . . . . . . . . . . . . . . .  8
       3.2.5.  Casemapping  . . . . . . . . . . . . . . . . . . . . .  8
       3.2.6.  Additional Mappings  . . . . . . . . . . . . . . . . .  8
       3.2.7.  Directionality . . . . . . . . . . . . . . . . . . . .  8
     3.3.  FreeClass  . . . . . . . . . . . . . . . . . . . . . . . .  9
       3.3.1.  Valid  . . . . . . . . . . . . . . . . . . . . . . . .  9
       3.3.2.  Disallowed . . . . . . . . . . . . . . . . . . . . . .  9
       3.3.3.  Unassigned . . . . . . . . . . . . . . . . . . . . . .  9
       3.3.4.  Normalization  . . . . . . . . . . . . . . . . . . . .  9
       3.3.5.  Casemapping  . . . . . . . . . . . . . . . . . . . . . 10
       3.3.6.  Additional Mappings  . . . . . . . . . . . . . . . . . 10
       3.3.7.  Directionality . . . . . . . . . . . . . . . . . . . . 10
   4.  Use of PRECIS String Classes . . . . . . . . . . . . . . . . . 10
     4.1.  Principles . . . . . . . . . . . . . . . . . . . . . . . . 10
     4.2.  Subclassing  . . . . . . . . . . . . . . . . . . . . . . . 11
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