PRECIS Framework: Preparation and Comparison of Internationalized Strings in Application Protocols
draft-ietf-precis-framework-03
Network Working Group P. Saint-Andre
Internet-Draft Cisco Systems, Inc.
Obsoletes: 3454 (if approved) M. Blanchet
Intended status: Standards Track Viagenie
Expires: November 11, 2012 May 10, 2012
PRECIS Framework: Preparation and Comparison of Internationalized
Strings in Application Protocols
draft-ietf-precis-framework-03
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
handle various classes of strings in a way that depends on the
properties of Unicode code points and that 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
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on November 11, 2012.
Saint-Andre & Blanchet Expires November 11, 2012 [Page 1]
Internet-Draft PRECIS Framework May 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
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
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 . . . . . . . . . . . . . . . . . . . . . . . . . 4
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 5
3. String Classes . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1. NameClass . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1.1. Valid . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1.2. Disallowed . . . . . . . . . . . . . . . . . . . . . . 7
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 . . . . . . . . . . . . . . . . . . . . . . . . 8
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
4.3. Registration . . . . . . . . . . . . . . . . . . . . . . . 11
5. Code Point Properties . . . . . . . . . . . . . . . . . . . . 11
6. Category Definitions Used to Calculate Derived Property
Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Show full document text