[XeTeX] Hyphenation questions

[Vadim Radionov]

Hello,

I have a couple of questions about hyphenation.

First of all, am I wrong or XeTeX does not show possible hyphenation points
in output when typesetting with fonts other than default?  (I'm missing it.)
Here are the outputs of a short test with only difference in the font used

(a) This is XeTeX, Version 3.1415926-2.2-0.9994.1 (Web2C 7.5.6)
entering extended mode
(./test.tex
Overfull \hbox (3.50842pt too wide) in paragraph at lines 9--10
[]\x This is Supercal-|

Overfull \hbox (15.85173pt too wide) in paragraph at lines 9--10
\x ifragilisticexpialidocious |
[1] )

(b)  This is XeTeX, Version 3.1415926-2.2-0.9994.1 (Web2C 7.5.6)
entering extended mode
(./test.tex
Overfull \hbox (1.9475pt too wide) in paragraph at lines 9--10
\tenrm cal-ifrag-ilis-tic-ex-pi-ali-|
[1] )


Second.  Can I add hyphenation with \hyphenaton{so-me-th-ing} in preamble,
as in TeX?

Third (not hyphenation).  How does XeTeX determine the normal space, shrink
and stretch?

And fourth. Is it OK to change the catcode of certain unicode symbol?

Thank you in advance,

Vadim
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