speak Spanish and use google translator, so maybe it is not well understood, but brynn're right.
In your objects.svg Enlaze nested, it is clear what I want to do exactly that.
Do not quite understand what it says under the picture, but that xml editor seems to have to write some code, which cost me a lot, I can not believe I have something automatic inkscape to do that, sure there is, but not find it.
What I was doing was duplicating the object, then increased the fatter line and to double descombinaba the way and erased the path outside leaving the inside, but it is time consuming and sometimes confusing.
image capture is what I do, it can be any shape, but I see a fijate captura2 image detail, what happens when we get there that also want to continue to close that gap?
Also you can do or not is up and could not because you can close more?
Friend thank you very much for your reply and your time brynn