noNameSpaceLocation is not needed as we use our namespace as
the default one. If we use anything else, we anyway need to
declare what we use.
Copied the schema and dtd to website.
git-svn-id: https://pmd.svn.sourceforge.net/svnroot/pmd/trunk@7681 51baf565-9d33-0410-a72c-fc3788e3496d
