[XeTeX] Looking for a better font selection method

[Pektiong Tân]

>
> Some kind of "multiple current fonts" scheme, associated with
> different scripts, is a request that comes up from time to time, and
> could make things much simpler. It's not as straightforward as it
> sounds, though, because not all characters in Unicode are
> unambiguously identified with a single script; punctuation, in
> particular, is generally shared across scripts. Getting it "right" in
> all the edge cases is tricky.
>

That is why I suggest unicode blocks or unicode code point ranges,  
which are different from the concept of the "script".
Well, I am not an expert and I might be wrong. Assigning different  
fonts to different code points might still have problems which I  
can't foresee.
On the other hand, I doubt there will be a single font which provide  
enough OT support for all scripts in the unicode.

Cheers
Pektiong