[XeTeX] Follow-up to previous mail about hyphenation

[Philip Taylor]

Jonathan Kew wrote:

> Indeed, that \showhyphens will not work with native opentype fonts. 
> This is a known difference between using TFM-based vs OT fonts; it's 
> been discussed (and an alternative shown) on the list somewhere in the 
> distant past.

There is code, by Enrico Gregoria, for a replacement \showhypens buried 
deep in the file "xltxtra.dtx" (attached).  However, the code is 
completely incomprehensible to me, I have no idea how to convert a .dtx 
file into anything usable, and I cannot find a plain XeTeX equivalent.
-- 
/Philip Taylor/
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