[XeTeX] Whitespace in input

[Philip TAYLOR]

Zdenek Wagner wrote:

> The only  reasonable solution seems to be the one suggested by Phil Taylor, to
> extend \catcode up to 255 and assign special categories to other types
> of characters. Thus we could say that normal space id 10, nonbreakable
> space is 16, thin space is 17 etc. XeTeX will then be able to treat
> them properly.

which may, unfortunately, then require new types of node
in TeX's internal list structures ...

(may, not will).

** Phil.