Question on Canonical equivilance

From: Tim Greenwood (timothy.greenwood@gmail.com)
Date: Wed Nov 24 2004 - 10:26:28 CST

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    All of the spacing combining marks (general category Mc) except
    musical symbols have a canonical combining class of 0. So, for example

    0B95 (TAMIL LETTER KA) 0BC7 (TAMIL VOWEL SIGN EE - stands to the left
    of the consonant) 0BBE (TAMIL VOWEL SIGN AA - on the right) is
    canonically distinct from 0B95 0BBE 0BC7 - even though I presume that
    they would generate an identical glyph. Why is this? The Canonical
    Combining Class Values in UCD.html has entries and values for left
    attached and right attached - but no characters have these values.

    - Tim

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