Take out xhtml, which was a stub and is no longer available at URL
Take out xhtml, which was a stub and is no longer available at URL

CantemoInternal/pyxb,CantemoInternal/pyxb,jonfoster/pyxb1,jonfoster/pyxb2,jonfoster/pyxb-upstream-mirror,CantemoInternal/pyxb,jonfoster/pyxb-upstream-mirror,jonfoster/pyxb2,jonfoster/pyxb-upstream-mirror,balanced/PyXB,pabigot/pyxb,jonfoster/pyxb1,pabigot/pyxb,balanced/PyXB,jonfoster/pyxb2,balanced/PyXB