[XeTeX] Using the Unicode prime character (Was re. Single glyphs from a font)

[Will Robertson]

On 2009-06-10 08:54:40 +0930, Ross Moore 
<ross at ics.mq.edu.au> said:

> Not that multiple primes work using $f''''$
> or (equivalently) $f^{\prime\prime\prime\prime}$.
> But maybe these primes are a bit small.
> With my Unicode patch $f\prime\prime\prime\prime$ looks good too.

This is obviously something I need to address in unicode-math. I've 
added a couple of issues to the tracker in the developmental repository:
  <http://github.com/wspr/unicode-math/issues/>

Not much time to work on this code myself but more than happy to add 
patches if they come with a simple test file.

Many thanks,
Will