[Zope] svn and webdav

Hi all, I know that this doesn't belong on THIS list, but I would appreciate if someone is able to answer my question. Why it isn't possible to access the svn repository (svn.zope.org) through webdav? It would be convenient to do so, because of no firewall problems. From the cvs it is at least posssible to download a tarball, is this feature in the svn version of viewcvs not implemented or just switched of? Thanks Juergen Rose