The i;codepoint collation
draft-hoehrmann-cp-collation-01
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Network Working Group B. Hoehrmann
Internet-Draft September 15, 2010
Intended status: Informational
Expires: March 19, 2011
The i;codepoint collation
draft-hoehrmann-cp-collation-01
Abstract
This memo describes the "i;codepoint" collation. Character strings
are compared based on the Unicode scalar values of the characters.
The collation supports equality, substring, and ordering operations.
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 March 19, 2011.
Copyright Notice
Copyright (c) 2010 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
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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.
Hoehrmann Expires March 19, 2011 [Page 1]
Internet-Draft The i;codepoint collation September 2010
1. Introduction
The i;codepoint collation operates on Unicode strings and treats any
and all differences between two strings as significant. Ordering of
different strings is determined by the Unicode scalar values of the
characters. It produces usable results where further information is
unavailable. In that it is suitable as default collation.
The equality operation determines if two strings are identical. This
makes the collation suitable for use with strings known to be in some
canonical form. Similarily, applications that require strings to be
in a canonical but otherwise arbitrary order may find this collation
the most efficient as it requires no transformations.
2. Definition
The i;codepoint collation is the same as the i;octet collation except
that it operates on sequences of Unicode scalar values, not octets.
Note that by definition the set of Unicode scalar values excludes the
surrogate code points and as such they do not occur in valid input.
3. Security Considerations
None beyond those in RFC 4790 [RFC4790].
4. IANA Considerations
This document defines the i;codepoint collation as per [RFC4790].
5. Registration document
<?xml version='1.0'?>
<!DOCTYPE collation SYSTEM 'collationreg.dtd'>
<collation rfc="XXXX" scope="global" intendedUse="common">
<identifier>i;codepoint</identifier>
<title>Unicode identity</title>
<operations>equality order substring</operations>
<specification>RFC XXXX</specification>
<owner>IETF</owner>
<submitter>bjoern@hoehrmann.de</submitter>
</collation>
6. References
[RFC4790] Newman, C., Duerst, M., and A. Gulbrandsen, "Internet
Application Protocol Collation Registry", RFC 4790,
March 2007.
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Internet-Draft The i;codepoint collation September 2010
Author's Address
Bjoern Hoehrmann
Mittelstrasse 50
39114 Magdeburg
Germany
EMail: mailto:bjoern@hoehrmann.de
URI: http://bjoern.hoehrmann.de
Note: Please write "Bjoern Hoehrmann" with o-umlaut (U+00F6) wherever
possible, e.g., as "Björn Höhrmann" in HTML and XML.
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