RE: [EXTERNAL] Some braille references

Hmm. That's not my understanding. The various apostrophes have different usages. The ASCII apostrophe is often used for input that is then autocorrected to a left/right apostrophe according to context. But in a math zone, it's usually autocorrected to a superscripted prime (U+2032). So the various apostrophes aren't interchangeable. The Unicode Standard<https://www.unicode.org/charts/PDF/U0000.pdf> says about U+0027 (my highlighting): "preferred characters in English for paired quotation marks are 2018 '  & 2019 ' ". That doesn't imply that U+0027 is deprecated (which it isn't).

Thanks,
Murray

From: Hammond, William F <whammond@albany.edu>
Sent: Tuesday, July 13, 2021 8:02 PM
To: Susan Jolly <easjolly@ix.netcom.com>; 'Deyan Ginev' <deyan.ginev@gmail.com>
Cc: 'Neil Soiffer' <soiffer@alum.mit.edu>; 'David Farmer' <farmer@aimath.org>; 'Sam Dooley' <samdooley64@gmail.com>; 'Noble, Stephen' <steve.noble@pearson.com>; Murray Sargent <murrays@exchange.microsoft.com>; 'Louis Maher' <ljmaher03@outlook.com>; www-math@w3.org
Subject: Re: [EXTERNAL] Some braille references

Susan --

I am in agreement with your ideas, and I think they represent the basic idea in Unicode.  However, there are places where the Unicode folk seem to think that characters are glyphs.  For example, they deprecate the use of the ASCII apostrophe U+0027 for the standard apostrophe and suggest that the apostrophe and the English right-single-quote should both sit in the location U+2019 since, they say, the same glyph should be used for both the apostrophe and the English right-single-quote.

           -- Bill

________________________________
From: Susan Jolly <easjolly@ix.netcom.com>
<mailto:sjolly@ix.netcom.com%3e%0b>Sent: Tuesday, July 13, 2021 7:08 PM
To: 'Deyan Ginev' <deyan.ginev@gmail.com>
<mailto:yan.ginev@gmail.com%3e%0b>Cc: 'Neil Soiffer' <soiffer@alum.mit.edu>;<mailto:iffer@alum.mit.edu%3e;> 'David Farmer' <farmer@aimath.org>;<mailto:rmer@aimath.org%3e;> 'Sam Dooley' <samdooley64@gmail.com>;<mailto:mdooley64@gmail.com%3e;> Hammond, William F <whammond@albany.edu>;<mailto:ammond@albany.edu%3e;> 'Noble, Stephen' <steve.noble@pearson.com>; <mailto:eve.noble@pearson.com%3e;%20> 'Murray Sargent' <murrays@exchange.microsoft.com>; <mailto:rays@exchange.microsoft.com%3e;%20> 'Louis Maher' <ljmaher03@outlook.com>; w<mailto:aher03@outlook.com%3e;%20w>ww-math@w3.org <ww<mailto:math@w3.org%20%3cww>w-math@w3.org>
Su<mailto:math@w3.org%3e%0bSu>bject: RE: [EXTERNAL] Some braille references

Hi Deyan,

I'm confused by what you wrote.  My understanding of Unicode is that it
distinguishes characters from glyphs and that a great deal of effort has
gone into creating the Unicode set of over 100,000 unique characters.
Characters in Unicode are distinguished by their numerical character codes,
not by their visual appearance.  Unicode decided back in 1993 that a colon
punctuation mark and the mathematical symbol for ratio are two different
characters. If my understanding up to this point is incorrect, please
correct me.

It is also my understanding that characters are displayed visually by glyphs
with the Unicode tables providing a typical or reference glyph for each
character.  However the visual appearance of a given character is not going
to be identical in all fonts.

The use of Unicode character codes aids in the automatic translation of math
to braille.  Of course a given braille system cannot define easy-to-remember
braille symbols for all of the Unicode characters so it needs some method
for dealing with this issue.  One posssibility  is direct representation of
hexidecimal character codes.

Susan J.