PRECIS Framework: Preparation and Comparison of Internationalized Strings in Application Protocols
draft-ietf-precis-framework-17
| The information below is for an old version of the document |
| Document |
Type |
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Active Internet-Draft (precis WG)
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Authors |
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Peter Saint-Andre
,
Marc Blanchet
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Last updated |
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2014-07-31
(latest revision 2014-05-27)
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Replaces |
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draft-blanchet-precis-framework
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Stream |
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IETF
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Intended RFC status |
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Proposed Standard
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Formats |
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pdf
htmlized (tools)
htmlized
bibtex
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Reviews |
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WG state
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Submitted to IESG for Publication
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Document shepherd |
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Alexey Melnikov
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Shepherd write-up |
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Show
(last changed 2014-02-10)
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| IESG |
IESG state |
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Approved-announcement to be sent::Revised I-D Needed
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Consensus Boilerplate |
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Yes
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Telechat date |
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Responsible AD |
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Pete Resnick
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Send notices to |
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precis-chairs@tools.ietf.org, draft-ietf-precis-framework@tools.ietf.org, precis@ietf.org
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| IANA |
IANA review state |
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Version Changed - Review Needed
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PRECIS P. Saint-Andre
Internet-Draft &yet
Obsoletes: 3454 (if approved) M. Blanchet
Intended status: Standards Track Viagenie
Expires: November 28, 2014 May 27, 2014
PRECIS Framework: Preparation and Comparison of Internationalized
Strings in Application Protocols
draft-ietf-precis-framework-17
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
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 28, 2014.
Copyright Notice
Copyright (c) 2014 IETF Trust and the persons identified as the
document authors. All rights reserved.
Saint-Andre & Blanchet Expires November 28, 2014 [Page 1]
Internet-Draft PRECIS Framework May 2014
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 . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 5
3. String Classes . . . . . . . . . . . . . . . . . . . . . . . 6
3.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . 6
3.2. IdentifierClass . . . . . . . . . . . . . . . . . . . . . 7
3.2.1. Valid . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2.2. Contextual Rule Required . . . . . . . . . . . . . . 8
3.2.3. Disallowed . . . . . . . . . . . . . . . . . . . . . 8
3.2.4. Unassigned . . . . . . . . . . . . . . . . . . . . . 9
3.2.5. Examples . . . . . . . . . . . . . . . . . . . . . . 9
3.3. FreeformClass . . . . . . . . . . . . . . . . . . . . . . 9
3.3.1. Valid . . . . . . . . . . . . . . . . . . . . . . . . 9
3.3.2. Contextual Rule Required . . . . . . . . . . . . . . 10
3.3.3. Disallowed . . . . . . . . . . . . . . . . . . . . . 10
3.3.4. Unassigned . . . . . . . . . . . . . . . . . . . . . 10
3.3.5. Examples . . . . . . . . . . . . . . . . . . . . . . 10
4. Profiles . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.1. Principles . . . . . . . . . . . . . . . . . . . . . . . 11
4.1.1. Width Mapping . . . . . . . . . . . . . . . . . . . . 11
4.1.2. Additional Mappings . . . . . . . . . . . . . . . . . 12
4.1.3. Case Mapping . . . . . . . . . . . . . . . . . . . . 12
4.1.4. Normalization . . . . . . . . . . . . . . . . . . . . 12
4.1.5. Directionality . . . . . . . . . . . . . . . . . . . 12
4.1.6. Exclusions . . . . . . . . . . . . . . . . . . . . . 13
4.2. Building Application-Layer Constructs . . . . . . . . . . 13
4.3. A Note about Spaces . . . . . . . . . . . . . . . . . . . 14
5. Order of Operations . . . . . . . . . . . . . . . . . . . . . 14
6. Code Point Properties . . . . . . . . . . . . . . . . . . . . 15
7. Category Definitions Used to Calculate Derived Property . . . 17
7.1. LetterDigits (A) . . . . . . . . . . . . . . . . . . . . 17
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