Fix like a87e2c7 but applying to validation
Fix like a87e2c7 but applying to validation

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