Add routine for checking basic structural information of namespaces
Add routine for checking basic structural information of namespaces

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