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Re: [XML-Entities] Question regarding some Unicode sequences

From: David Carlisle <davidc@nag.co.uk>
Date: Sun, 18 May 2014 22:06:00 +0100
Message-ID: <537920B8.1000509@nag.co.uk>
To: <www-math@w3.org>
On 17/05/2014 02:45, Shervin Afshar wrote:
> Hello,
 > I noticed that the Unicode sequences of more than one codepoints are
 > assigned to some entities which already had single Unicode codepoints
 > representation at the time of addition to MathML; e.g. "race" entity
 > from isoamsb set is mentioned as U+223D U+0331 (REVERSED TILDE,
 > COMBINING MACRON BELOW) while it can also be presented as U+22CD. Is
 > there any specific reason for this preference?
 > Thanks.
 > Shervin ↪ shervinafshar.name <http://www.shervinafshar.name>

Thanks for your comments,

I suspect that one just got missed, sorry. We worked hard to get rid of 
most of the
  multiple character entities and the remaining ones (including race) 
are listed here


Given that the original ISO definitions had no font mappings and just 
low resolution images,
giving unicode definitions to the set was always something of a black 
art, with room for human error....

While I think it _could_ have been defined the way you suggest I don't 
think it should change now, it's
been that way in mathml (and now html) for a long time, and 22CD, if you 
need it, already
has two names bsime (from isaomsr) and backsimeq so adding a third name 
for that symbol
wouldn't really help much and just lead to incompatible definitions 
being used.

Received on Sunday, 18 May 2014 21:06:35 UTC

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