From: Peter Constable (petercon@microsoft.com)
Date: Wed Feb 18 2004 - 10:47:03 EST
> From: unicode-bounce@unicode.org [mailto:unicode-bounce@unicode.org]
On Behalf
> Why couldn't there exist a combining subscript modifier, added after a
base
> character, to make it look like a subscript, and that could be given a
maximum
> combining class 255?
Because this is Unicode and not CourtyardCode?
This is *not* a good idea.
> So that's
> something which can be handled in fonts.
I need to create *ligatures* for thousands of possible base-subscript
pairs in all of my fonts? I've got to decide how I should display < a,
combining acute, combining subscript modifier >, possibly adding
thousands more base-subscript-combining mark ligatures into my font?
I've got to decide how I should display an Arabic sequence like < seen,
seen, combining subscript modifier, seen > (what does or doesn't
connect?)? And Devanagari < ka, virama, combining subscript modifier,
ssa >? And < c, ZWJ, t, combining subscript modifier > or < c, combining
subscript modifier, ZWJ, t >? I've got to decide how I should display <
U+00B2 superscript two, combining subscript modifier > and < U+2081
subscript one, combining subscript modifier >?
Not to mention that I've got to tell our app developers they have to
figure out whether users expect < subscript one > and < digit one,
combining subscript modifier > to sort together and be matched in
searches? And whether < digit one, digit two, combining subscript
modifier > is interpreted as having a numeric value of 12 or 1?
I don't think this rocket will make it off the pad, let alone past the
tower.
Peter
Peter Constable
Globalization Infrastructure and Font Technologies
Microsoft Windows Division
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