PRECIS Framework: Preparation and Comparison of Internationalized Strings in Application Protocols
draft-ietf-precis-framework-13

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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: June 8, 2014                                   December 5, 2013

   PRECIS Framework: Preparation and Comparison of Internationalized
                    Strings in Application Protocols
                     draft-ietf-precis-framework-13

Abstract

   Application protocols using Unicode characters in protocol strings
   need to properly prepare such strings in order 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 and comparison of
   internationalized strings ("PRECIS") in a way that depends on the
   properties of Unicode characters 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).  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 June 8, 2014.

Copyright Notice

   Copyright (c) 2013 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

Saint-Andre & Blanchet    Expires June 8, 2014                  [Page 1]
Internet-Draft              PRECIS Framework               December 2013

   Provisions Relating to IETF Documents
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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  5
   3.  String Classes . . . . . . . . . . . . . . . . . . . . . . . .  6
     3.1.  Overview . . . . . . . . . . . . . . . . . . . . . . . . .  6
     3.2.  IdentifierClass  . . . . . . . . . . . . . . . . . . . . .  7
     3.3.  FreeformClass  . . . . . . . . . . . . . . . . . . . . . .  9
   4.  Profiles . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
     4.1.  Principles . . . . . . . . . . . . . . . . . . . . . . . . 10
     4.2.  Building Application-Layer Constructs  . . . . . . . . . . 12
     4.3.  A Note about Spaces  . . . . . . . . . . . . . . . . . . . 13
   5.  Order of Operations  . . . . . . . . . . . . . . . . . . . . . 14
   6.  Code Point Properties  . . . . . . . . . . . . . . . . . . . . 14
   7.  Category Definitions Used to Calculate Derived Property  . . . 16
     7.1.  LetterDigits (A) . . . . . . . . . . . . . . . . . . . . . 16
     7.2.  Unstable (B) . . . . . . . . . . . . . . . . . . . . . . . 17
     7.3.  IgnorableProperties (C)  . . . . . . . . . . . . . . . . . 17
     7.4.  IgnorableBlocks (D)  . . . . . . . . . . . . . . . . . . . 17
     7.5.  LDH (E)  . . . . . . . . . . . . . . . . . . . . . . . . . 17
     7.6.  Exceptions (F) . . . . . . . . . . . . . . . . . . . . . . 17
     7.7.  BackwardCompatible (G) . . . . . . . . . . . . . . . . . . 19
     7.8.  JoinControl (H)  . . . . . . . . . . . . . . . . . . . . . 19
     7.9.  OldHangulJamo (I)  . . . . . . . . . . . . . . . . . . . . 19
     7.10. Unassigned (J) . . . . . . . . . . . . . . . . . . . . . . 20
     7.11. ASCII7 (K) . . . . . . . . . . . . . . . . . . . . . . . . 20
     7.12. Controls (L) . . . . . . . . . . . . . . . . . . . . . . . 20
     7.13. PrecisIgnorableProperties (M)  . . . . . . . . . . . . . . 20
     7.14. Spaces (N) . . . . . . . . . . . . . . . . . . . . . . . . 21
     7.15. Symbols (O)  . . . . . . . . . . . . . . . . . . . . . . . 21
     7.16. Punctuation (P)  . . . . . . . . . . . . . . . . . . . . . 21
     7.17. HasCompat (Q)  . . . . . . . . . . . . . . . . . . . . . . 21