[libvirt] [RFC] why netcf/libvirt lists/dumpxml only unslaved/unsubordinated interfaces?

It could be useful to dumpxml of slaves/subordinates too to introspect host interfaces tree in dephts. Now it is not possible: 'Interface eth0 does not exist or is not a toplevel interface'. Has it some deeper meaning or netcf can be enhanced? (and *libvirt* as well). Nikolay