debian has a package with those dtds: w3c-dtd-xhtml
that is a warning, not an error, right? so you can ignore it.
> Since the script is getting the wiki page over the Internet I suppose
> the computer _is_ connected to the Internet.
as said, it happend here and there that w3c.org was not responding well,
so using nonet and installing the dtd localy solved that. It annoyed me
that the nightly snapshots script were dependend on w3c.org's well-being.
given this history, I think the change is resonable. ok?