Add infrastructure to verify derivation consistency for simple types
Add infrastructure to verify derivation consistency for simple types

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