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Date: Wed, 26 Aug 2015 12:02:16 +0200
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On Tue, 25 Aug 2015 17:02:10 -0400
"Evan Foss (evanfoss AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com> wrote:

> On Tue, Aug 25, 2015 at 4:37 PM, Peter Stuge (peter AT stuge DOT se) [via
> geda-user AT delorie DOT com] <geda-user AT delorie DOT com> wrote:
> > Evan Foss (evanfoss AT gmail DOT com) [via geda-user AT delorie DOT com] wrote:
> >> The problem that has been consuming my mind or a few months now is
> >> how all of this should be represented in memory.
> >
> > Linked lists. The overhead is small.
> 
> Yes but you want the lists to be meaningful. Just having a list of
> elements on a layer is not enough. The way you store the info makes
> moving footprints or moving traces more straight forward to implement.

I guess it would be possible to get different views. What is needed is a set of functions to access the data. I guess should be a need for: iterate thru the objects on one layer, iterate thru the nets, iterate thru the descriptors, extract symbols with a particular value, iterate thru symbol coordinates to renumber them left rigt, ...