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From: karl AT aspodata DOT se
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] XML file format (what could be expected)
In-reply-to: <20151220125839.10228.qmail@stuge.se>
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Comments: In-reply-to "Peter Stuge (peter AT stuge DOT se) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
   message dated "Sun, 20 Dec 2015 13:58:39 +0100."
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Date: Sun, 20 Dec 2015 14:34:35 +0100 (CET)
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Precedence: bulk

Peter Stuge:
> Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com] wrote:
> > I do not think file format is important.
> 
> You are absolutely right about this, the data model is the challenge,
> not how to store it, that's trivial.
> 
> 
> > It is better to bring discussion to the structure itself, if
> > visualized as a tree which forks and attributes are needed.
> 
> Indeed the structure (data model) is what we need to come up with.
> 
> Use all known constructs. Storing them is again not the problem.
...

To be frank, I'd rather wish for a programming language instead of a 
data model, concider the difference between postscript and pdf.

I'd like to be able to do, gschem:

. give parameters to subsheets, like
  output is to be 12V select suitable resistor devider
  this filter has this freq., select suitable components

there should be no reason that I must copy the sheet and exchange a few 
small values

Pcb:

. make theese things a group
  set values (e.g. refdes) from paramaters
  move everything in the group as one, like it remebers selections

this track has with = width of another track
this track has constant distance to another track from here to there
width of track = current2width(2A);
track_parameters = impedance2track(50Ohm);

///

With a data model, things are set in stone, with a programming lang.
you can invent.

Why should we have symbol and footprint generators, when it could be
included in the "data model".

Regards,
/Karl Hammar

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