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Date: Fri, 11 Sep 2015 13:07:46 -0400
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From: DJ Delorie <dj AT delorie DOT com>
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Subject: Re: [geda-user] About reinventing the wheel, and how to avoid it
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> It could be a lot easier to add copper spacing rules in the
> schematic. I guess attaching spacing attribute to nets possible
> refering to a specific category for example "InverterOutputVoltage"
> may solve it in the schematic but it must also be transferred to the
> layout.

Sure, attaching text to objects is easy if the application doesn't
need to understand the text.  gschem doesn't impose any copper spacing
rules on schematics, so it doesn't care what text you add relating to
copper spacing rules.  It's just text.

PCB has to enforce the rules, so it needs to both understand the
desired rules and know how to impose them on the design.  That's a
much harder task than just keeping track of some text.

I'm not denigrating the usefulness of being able to put arbitrary text
anywhere; we added that to pcb (somewhat) as well.  But don't think
that being able to add a chunk of text is the same as doing something
useful with that text.