IDNA Review for New Unicode Versions
draft-klensin-idna-unicode-review-05

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Last updated 2019-11-12 (latest revision 2019-11-03)
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Network Working Group                                         J. Klensin
Internet-Draft
Updates: 589 (if approved)                                  P. Faltstrom
Intended status: Standards Track                                  Netnod
Expires: May 6, 2020                                   November 03, 2019

                  IDNA Review for New Unicode Versions
                  draft-klensin-idna-unicode-review-05

Abstract

   The standards for Internationalized Domain Names in Applications
   (IDNA) require a review of each new version of Unicode to determine
   whether incompatibilities with prior versions or other issues exist
   and, where appropriate, to allow the IETF to decide on the trade-offs
   between compatibility with prior IDNA versions and compatibility with
   Unicode going forward.  That requirement, and its relationship to
   tables maintained by IANA, has caused significant confusion in the
   past.  This document makes adjustments to the review procedure based
   on experience and updates IDNA, specifically RFC 5892, to reflect
   those changes and clarify the various relationships involved.  It
   also makes other minor adjustments to align that document with
   experience.

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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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on May 6, 2020.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Klensin & Faltstrom        Expires May 6, 2020                  [Page 1]
Internet-Draft            IDNA-Unicode Reviews             November 2019

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://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
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Brief History of IDNA Versions, the Review Requirement, and
       RFC 5982  . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  The Review Model  . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Review Model Part I: Algorithmic Comparison . . . . . . .   5
     3.2.  Review Model Part II: New Code Point Analysis . . . . . .   5
   4.  IDNA Assumptions and Current Practice . . . . . . . . . . . .   6
   5.  Derived Tables Published by IANA  . . . . . . . . . . . . . .   7
   6.  Editorial clarification to RFC 5892 . . . . . . . . . . . . .   8
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   8
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  10
     10.2.  Informative References . . . . . . . . . . . . . . . . .  11
   Appendix A.  Summary of Changes to RFC 5892 . . . . . . . . . . .  13
   Appendix B.  Background and Rationale for Expert Review Procedure
                for New Code Point Analysis  . . . . . . . . . . . .  14
   Appendix C.  Change Log . . . . . . . . . . . . . . . . . . . . .  15
     C.1.  Changes from version -00 (2019-06-12) to -01  . . . . . .  15
     C.2.  Changes from version -01 (2019-07-06) to -02  . . . . . .  16
     C.3.  Changes from version -02 (2019-07-22) to -03  . . . . . .  16
     C.4.  Changes from version -03 (2019-08-29) to -04  . . . . . .  16
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  16

1.  Introduction

   The standards for Internationalized Domain Names in Applications
   (IDNA) require a review of each new version of Unicode to determine
   whether incompatibilities with prior versions or other issues exist
   and, where appropriate, to allow the IETF to decide on the trade-offs
   between compatibility with prior IDNA versions and compatibility with
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