[XeTeX] Hyphenation patterns and Unicode

[Nicola Vitacolonna]

Hi everybody,
the XeTeX FAQ says that hyphenation patterns should be "true Unicode"  
files. It is not clear to me if the following (excerpt of a) file  
(for Lithuanian) is ok:

\def\ltletters{
\catcode"81=11\lccode"81="A1\uccode"81="81%A nosine
\catcode"83=11\lccode"83="A3\uccode"83="83%C su pauksteliu
\catcode"84=11\lccode"84="A4\uccode"84="84%E su tasku
% etc...
}
\ltletters
\patterns{
.ap1
.api1
.a^^b23v
%etc...
}

I would like to add this file to language.dat, rebuild all format  
files, and use LaTeX or XeLaTeX with babel. Is this expected to work?  
Or should I use the above file only for LaTeX with babel, and go for  
a different solution when I want to use XeLaTeX?

Nicola