[XeTeX] unicode-math package and \UnicodeMathSymbol command

[Will Robertson]

On 2009-06-22 15:20:07 +0930, Ross Moore 
<ross at ics.mq.edu.au> said:

>>  i'm just trying to use the command defined there, not define it  
>> myself.  once i
>> \usepackage{unicode-math}, \UnicodeMathSymbol seems to be in scope  since i am
>> able to call it without error, but also without the desired effect.
>>   am i missing something here?
> 
> That is because you are not supposed to mess with it, unless you
> know what you are doing.  :-)
> Will defines it to do nothing, because you may be tempted to play.
> He wants to make that kind of playing around totally ineffective,
> and he seems to have achieved this aim admirably.

Haha, that's not exactly what my intention was, but okay :)

The file unicode-math.tex is supposed to be a "database" of sorts, with 
\UnicodeMathSymbol simply acting as a logical wrapper around each 
entry. Hence the totally useless fourth argument that just contains a 
description of the codepoint, which I'd never include in a "command" to 
set up the behaviour of the character/macro.

Features that we're talking about to change the meaning of various 
symbols in different contexts require another interface on top; this 
interface doesn't really exist at the moment.

Will