[Inkscape-devel] Connect figures like ms visio or dia.

Hello! I've just downloaded Inkscape and found It very nice. There is all I need which is not lacked in Ms visio. But only one thing dissapointed. Paths connection between figures are static, so while moving figure, connecting path is'nt been updated. I would like to make extension which aggressively snaps path to object. But I can't find propper manual. I suppose to make by analogy with existing exts. So where I can find info about path snapping classes and methods? Or maybe it better to do by parsing xml and dynamically update paths? Also how to acces inner xml? Is it possible to use cpp .dll code in inkscape?