Michael Everson wrote:
>I've never been convinced that Level 1 and Level 2 of 10646 differ in any
>significant way. The "combining characters" which are actually Devanagari
>vowels, for instance, are only combining in the sense that their glyphs
>behave in a particular way as regards to the preceding character. There has
>been some discussion in WG2 regarding this, and I think in WG3 regarding
>the situation of Thai (level 2) and of Vietnamese (level 3) in 8859.
Sorry to disagree. From a user's point, the difference matters very
much, in particular for Indic scripts.
From an implementor's point, the Devanagari vowels combine
with the previous CLUSTER or consonants. According to ISCII
13194 :1991, the worst case is four consonants, to which you
have to add three viramas to connect them. Quite a lot more
lookahead (in this case for rendering) than for most accented
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