From: James Kass (thunder-bird@earthlink.net)
Date: Tue Sep 04 2007 - 07:05:24 CDT
Kenneth Whistler wrote (2007/08/29)
>And the defectiveness of the 24XX characters for this purpose,
>even *if* the font supports display of those characters --
>because they are limited essentially to C0 control codes
>and SPACE, and don't cover very important Unicode
>format controls like the bidi controls -- dictate that it
>would be unwise for most applications to assume that they
>could depend on the fonts to do anything rational or consistent
>for this.
The C0 controls plus SPACE were once *the* set of control
characters and remain essential.
It is exactly because of the "defectiveness" of existing control
pictures in covering all the newfangled Unicode controls that
application engineers (fonts are applications) have worked up
their own methods of displaying anything additional desired.
Like the ZWJ and certain bidi control conventions recommended
by Microsoft, which were pointed out earlier.
Unicode encodes characters and assigns properties to them.
Determining how and when they should be displayed is best left
to fonts and rendering engines and their respective designers.
Best regards,
James Kass
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