Checkpoint basic infrastructure for layer link
Checkpoint basic infrastructure for layer link

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