RFC 5051 · PROPOSED STANDARD · 2007
TUE · 15 SEP 2026
i;unicode-casemap - Simple Unicode Collation Algorithm
Overview
RFC 5051, “i;unicode-casemap - Simple Unicode Collation Algorithm”, is a Proposed Standard document published in October 2007 by M. Crispin. The canonical text is published by the RFC Editor.
Abstract
This document describes "i;unicode-casemap", a simple case-insensitive collation for Unicode strings. It provides equality, substring, and ordering operations. [STANDARDS-TRACK]
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
Read this RFC
The canonical text of RFC 5051 is hosted at rfc-editor.org. Available in TXT,HTML.
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