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Date: Thu, 13 Dec 2012 20:19:45 -0500
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From: DJ Delorie <dj AT delorie DOT com>
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In-reply-to: <172CCAAB-0423-43EF-8A04-5A9961F1D5B9@noqsi.com> (message from
	John Doty on Thu, 13 Dec 2012 18:16:34 -0700)
Subject: Re: [geda-user] Find rat lines
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> To expand on my confusion, I cannot understand how this could be
> difficult given that pcb is supposed to create a geometric
> arrangement of conductors and insulators implementing a netlist. But
> I find pcb very confusing in general. I cannot actually find in its
> design the concepts of "conductor", "insulator" and "geometry".

Your error is in the "is supposed to" assumption.

The purpose of PCB is to help people design circuit boards.

Your conductor/insulator/geometry paradigm is one of many ways to
acheive that goal, but it is not the way PCB chooses to solve it.