properties={'nics': relation(NIC, backref="machine", lazy=False),
'disks': relation(Disk, backref="machine", lazy=False),
'type': relation(Type, lazy=False),
properties={'nics': relation(NIC, backref="machine", lazy=False),
'disks': relation(Disk, backref="machine", lazy=False),
'type': relation(Type, lazy=False),