From: Karl Pentzlin (karl-pentzlin@acssoft.de)
Date: Thu Sep 18 2008 - 17:30:07 CDT
Am Donnerstag, 18. September 2008 um 18:08 schrieb Asmus Freytag:
>> 2008/9/17 Karl Pentzlin <karl-pentzlin@acssoft.de>:
>>> Elementary mathematical symbols:
>>> U+2264 LESS-THAN OR EQUAL TO - no own key needed, enter as:
>>> diacritical mark "combining macron below" + "less-than sign"
>>> U+2265 GREATER-THAN OR EQUAL TO - no own key needed, enter as:
>>> diacritical mark "combining macron below" + "greater-than sign"
AF> ... What's needed is another layer of software that is akin to a
AF> (much simplified version of an) Asian Input Method Editor. Such an IME
AF> will take multiple keystrokes and compose them into the correct symbol.
This is outside the means provided by ISO/IEC 9995-3, which only uses
diacritical marks to "combine graphical symbols".
A new ISO/IEC 9995-9 will probably more flexible.
For ISO/IEC 9995-3, there only the 47 unused places in Level 3 of the
common secondary group can be filled, two of them have already to be used
for the disintegration of the "or"s for two current key allocations.
Raising the number of characters which can be added beyond that
resulting number of 45 obviously requires some tricks, like the
"arcane" way listed for U+2264/2265.
The question is: should such characters included by such "tricks" now,
or not at all (i.e. be left for a later ISO/IEC 9995-9 which, whatever
its final shape will be, will allow multiple groups)?
- Karl Pentzlin
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