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Date: Wed, 15 Jul 2015 11:24:35 +0200 (CEST)
From: Roland Lutz <rlutz AT hedmen DOT org>
To: "Dave McGuire (mcguire AT neurotica DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Subject: Re: [geda-user] The new to do
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On Mon, 13 Jul 2015, Dave McGuire (mcguire AT neurotica DOT com) [via geda-user AT delorie DOT com] wrote:
> some stuff useful in the microwave world, like design aids for
> controlled-impedance traces.
>
>  Another very useful thing I'd pay for would be the inclusion of an
> attribute in gschem which tells PCB "this net needs to be 20mils" and
> have PCB automatically handle that.

The problem here is that to gEDA, a net is a non-topological entity.  You 
could assign attributes to nets (that wouldn't be that hard to implement), 
but then the "needs to be 20mils" attribute would apply to the whole of, 
e.g, the "GND" net which probably isn't what you are intending.

Representing the internal structute of a net in a way that makes this kind 
of attribute useful is much more difficult and would require a major 
addition to what the concept of a netlist entails.

Roland