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http://www.rfc-editor.org/rfc/rfc5051.txt
RFC 5051: i;unicode-casemap - Simple Unicode Collation Algorithm, M. Crispin
2007-10-01T23:00:00-00:00
This document describes "i;unicode-casemap", a simple case-insensitive collation for Unicode strings. It provides equality, substring, and ordering operations. [STANDARDS-TRACK]