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	Tue, 08 Dec 2015 00:14:17 -0800 (PST)
Date:	Tue, 8 Dec 2015 09:14:11 +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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> El 7 de diciembre de 2015 15:38:21 CET, "Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com> escribió:
> >It should only be a problem for the refdes since this is used as an
> >object identifier. 
> 
> What about using filename/instance->x_coord,y_coord as unique object identifier?

It might have been moved.

Since changes are stored in a file it is rather good if the function to update is idempotent https://en.wikipedia.org/wiki/Idempotence so that if it is applied more than once it make no difference.

To put a serial number on each symbol would work but change file format. To apply once is probably the method of choice but if updates are stored in a file changes must be idempotent or there must be a mechanism to check if update already have been done. To store some kind of number in *.pcb file or an extra file might be a solution.

It is a small problem but unless someone already invented a solution it must be done.


Nicklas Karlsson

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