This document contains informative material and normative specifications which have been considered and approved by the Unicode Technical Committee for publication as a Technical Report and as part of the Unicode Standard, Version 3.0 (forthcoming). Any reference to version 3.0 of the Unicode Standard automatically includes this technical report.

The content of all technical reports must be understood in the context of the appropriate version of the Unicode Standard. References in this technical report to sections of the Unicode Standard refer to the Unicode Standard, Version 3.0. See http://www.unicode.org/unicode/standard/versions/ for more information.

This technical report may undergo further editorial work before the release of the Unicode Standard, Version 3.0. The contents of section 7.2 are preliminary. Please mail corrigenda and other comments to the authors.