Internet DRAFT - draft-hoehrmann-cp-collation
draft-hoehrmann-cp-collation
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
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This Internet-Draft will expire on March 19, 2011.
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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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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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