This has been a very long threat and I admit not having read all mails. But I 
can resist
sharing my opinion with you.

LuaTeX and XeTeX use two quite different strategies and therefore address 
different
user communities: the former follows Knuth's philosophy of TeX being 
independent of
other technologies and provides a powerful tool for keeping complete control of 
typesetting;
the latter uses external facilities on the operating system level. The former 
will be used by
courageous people wanting to do any kind of task, from simple to extremely 
complex;
the latter will be used by people wanting a quick and reliable solution to 
standard problems.
Typically, imagine I want to do Arabic with different contextual rules (for any 
reason). With
LuaTeX it is possible, with XeTeX, AFAIK, I cannot be done. But, on the other 
hand, if
there is some beautiful font on my system which I want to use, it is infinitely 
easier to use
it with XeTeX than with any other kind of TeX.

But there are also political issues: LuaTeX is developed by a team focusing on 
ConTeXt.
LaTeX users will always be neglected, at least that is the feeling I have (Taco 
is very kind
and helpful but he is paid for a specific task, and LaTeX is not part of it).

What about the future? The ideal thing would be to merge them by having two 
branches of
data flow: one that goes through the operating system, one that is handled by 
Lua. (Something
similar happened with OTPs, which from Omega have migrated to LuaTeX, I don't 
wether they
are still there, but at some earlier versions of LuaTeX they were still 
operational.) The solution
is quite artificial but at least the XeTeX part would survive and maybe some 
day somebody
would do a real merge and have Lua control the interaction with the operating 
system.

cheers

Yannis

-- 
-------------------------------------------------------
Yannis Haralambous
Directeur d'études
Institut Mines-Télécom, Télécom Bretagne
Département Informatique
UMR CNRS 6285 Lab-STICC
Technopôle Brest Iroise
CS 83818, 29238 Brest Cedex 3, France
Tel: +33 2 29 00 14 27
Fax: +33 2 29 00 12 82
Email: yannis.haralamb...@telecom-bretagne.eu
Internet: http://omega.enstb.org/yannis
ICBM address: 48°21'31.57"N 4°34'16.76"W
Twitter: y_haralambous
-------------------------------------------------------
...pour distinguer l'extérieur d'un aquarium,
mieux vaut n'être pas poisson

...the ball I threw while playing in the park
has not yet reached the ground

Es gab eine Zeit, wo ich nur ungern über Schubert sprechen,
nur Nächtens den Bäumen und Sternen von ihm vorerzählen mögen.

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