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Date: Wed, 13 Jan 2016 08:47:00 -0800 (PST)
From: "Frank Miles (fpm AT u DOT washington DOT edu) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To: "Peter Clifton (petercjclifton AT googlemail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Subject: Re: [geda-user] Re: off-board parts/wiring
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On Tue, 12 Jan 2016, Peter Clifton (petercjclifton AT googlemail DOT com) [via geda-user AT delorie DOT com] wrote:

> 
> 
> On 12 Jan 2016 17:02, "Frank Miles (fpm AT u DOT washington DOT edu) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com> wrote:
> >
> 
> > Perhaps I'm confused.  I thought I had read that the netlist import was
> > deprecated, and that the proper way of importing the netlist was through
> > PCB:File/Import Schematics.  If netlist import is still equally valid,
> > then please accept my apology for the needless noise.
> >
> >         -F
> 
> The import mechanism was added as a more integrated way of retrieving this information, rather than relying on an external tool, 
> gsch2pcb to process your existing design file and make edits. (This tool had to read and make edits to the board files, so
> represented a barrier to format changes. This was probably not the initial motivation of the new mechanism, but represents a big
> plus point to its existence).
> 
> Underlying the mechanism is a netlist backend for gnetlist which describes the components and nets of the design using a series of
> pcb action commands. These are executed by pcb on the open design, and in turn update the internal view of the netlist.
> 
> The "old" netlist format is not deprecated, although it does not convey all of the information about parts etc.. (gsch2pcb managed
> that aspect based upon a template file a separate gnetlist backend would populate with all the parts of a given design).
> 
> Since gsch2pcb and associated netlist backends were in a separate code base to pcb, this represented a compatibility problem if ever
> we changed things with the file format. The new backend lives with PCB (iirc), so merely relies on gnetlist keeping a stable scheme
> api and command line interface.
> 
> You might be interested to know that the update mechanism can be wired to call a makefile (or other scripts?) to generate the
> required data, so it is infact quite general. Only the "schematics" attributes are really assumed to come from a simple gschem work
> flow.
> 
> At some point, I may update xgsch2pcb to use this new mechanism, rather than gsch2pcb. It seems redundant to update gsch2pcb itself
> though.
> 
> Peter

Thanks to you - Peter, Nicklas, and DJ - for the explanations.
One more question - where can I read about the differences, and
how this update mechanism might be used?

 	-F