Re: Canonical Combining Classes

From: Valeriy E. Ushakov (
Date: Wed Jan 12 2000 - 22:52:47 EST

On Wed, Jan 12, 2000 at 06:20:11PM -0800, John Hudson wrote:

129, 130, 132 - are combining classes for Tibetan vowel marks:

129 U+0F71 TIBETAN VOWEL SIGN AA (a.k.a. "lengthening achung" ['a
     chung]). Written immediately below the stack of consonants.

130 Tibetan vowel signs that are written ABOVE the stack of consonants

132 Tibetan vowel signs that are written BELOW the stack of consonants
     Only 'U' (U+0F74) is writen under the stack.

In Unicode 2.x every Tibetan vowel was assigned a separate combining
class, but in 3.x all the "above" vowel signs were collapsed into
combining class 130 (that of TIBETAN VOWEL SIGN I in 2.x) to support
contractions (bskungs yig), where multiple vowel signs can occur above
signle stack of consonants and their order does matter.

SY, Uwe

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