+
+class Machine(object):
+ pass
+
+class NIC(object):
+ pass
+
+class Disk(object):
+ pass
+
+class Type(object):
+ pass
+
+
+assign_mapper(ctx, Machine, machine_table, \
+ properties={'nics': relation(NIC),
+ 'disks': relation(Disk)});
+assign_mapper(ctx, NIC, nic_table)
+assign_mapper(ctx, Disk, disk_table)
+assign_mapper(ctx, Type, types_table)
+