Re: Regarding canonical combing class value for U+0F76 and similar characters (Unicode 6.2.0)

From: Richard Wordingham <>
Date: Sat, 18 May 2013 01:31:56 +0100

On Fri, 17 May 2013 16:22:14 -0700
Matt Ma <> wrote:

> U+0F76 is a non-spacing combing mark (Mn) but its combing class value
> is defined as 0. Is this expected?

The short answer is that it is normal for vowels in Indic scripts.

> The specialty of the character is
> that it is a composition of two combining marks, U+0FB2 and U+0F80.

Characters that decompose to just combining marks are a nuisance, and
cases like this where nothing in the decomposition has canonical
combining class 0 doubly so. The Tibetan vowels should have been
assigned to canonical combining class 0, but they weren't. If one uses
form NFD there is no problem, but some processing comes unstuck if one
tries to avoid normalisation.

Received on Fri May 17 2013 - 19:37:19 CDT

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