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Date: Tue, 8 Dec 2015 20:41:16 +0100
From: "Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] gsch2pcb after refdes-renum? (If implemented
 syncronization detail)
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> > To put a serial number on each symbol would work but change file format.
> 
> Nope. Just an attribute, but:
> 
> We’ve discussed this many times, and the problem is the unrestricted semantics of symbol instance copying. A program that put the necessary restrictions in place would no longer be gschem, and I expect it would be far less usable.
> 
> John Doty              Noqsi Aerospace, Ltd.
> http://www.noqsi.com/
> jpd AT noqsi DOT com

I also think file format is better without the serial number. I guess most updates are idempotent and for this everything is fine, did you also discuss a mechanism to make sure rename happen only once?

Nicklas Karlsson