[Inkscape-user] curve connectors between object

Hello,

I want to create links between objects (says some circles) so that when I move my objects , the links between them follows .(architecture schema) So I used connectors to link my circles Now I want those link/connectors to be curved, while I can curve them temporarily while manipulating the link, unfortunatly as soon as I move to another other object or link, my previous curved links returns to a straight line links :-( How can I created persistant curve connectors between objects ?

ascii art of what I want

from: () --------() _ _ _ / \ to: ()/ ()

Thanks.