#2 can anteater also validate xhtml1.1 for example?

[Ralf Hauser]

in the install-updates.xml I see that there is a
xhtml-schema, therefore, is it possible to have
anteater do the same a http://validator.w3c.org ?
If so, it would be great advertising this in example
and the FAQ!!
Also, if so, can it also validate CSS stylesheets and
check links?