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	Tue, 08 Dec 2015 12:52:58 -0800 (PST)
Date:	Tue, 8 Dec 2015 21:52:53 +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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> On Dec 8, 2015, at 9:41 AM, Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com] <geda-user AT delorie DOT com> wrote:
> 
> >>> 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?
> 
> There can’t be a mechanism. Consider the case where page 2 is a variant of page 1, so in a shell we:
> 
> cp page1.sch page2.sch
> gschem page2.sch
> 
> Or, how do you tell whether cut and paste represents a duplication operation or a move operation?
> 
> John Doty              Noqsi Aerospace, Ltd.
> http://www.noqsi.com/
> jpd AT noqsi DOT com

Yes of course. If schematic and pcb is compared it is only possible to tell the differences.


Nicklas Karlsson

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