# [XeTeX] Whitespace in input

Arthur Reutenauer arthur.reutenauer at normalesup.org
Tue Nov 15 16:02:36 CET 2011

```> "The latter" is what the TeXbok says (P.~39) : "Once a category code
> has been attached to a character token, the attachment is permanent."

Yes, because you meant individual tokens (which I understood in
retrospect).  But in the context of the discussion, you really seemed to
be saying that you could not change the \catcode's of characters to be
read, which was the point (not that there is much point left to the