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Subject:	[geda-user] What data models does gEDA have? (was: XML )
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From:	John Griessen <john AT ecosensory DOT com>
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Date:	Sun, 20 Dec 2015 08:49:20 -0600
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On 12/20/2015 06:58 AM, Peter Stuge (peter AT stuge DOT se) [via geda-user AT delorie DOT com] wrote:
> To the point: What data models does gEDA have? There are several.

2D physical as top:  PCB: overlapping of layer pieces matches against netname netlist during DRCs.
         gschem: net segments without netnames become part of a net when they touch.
Netlist as top:   PCB: netnames make a connection netlist against which is matched the DRC physical connectivity
   gschem: netnames create connections by attribs attached to nets.

======================not in geda yet========================
3D physical as top:  overlapping and vertical proximity create connection.  Pure physical model of via stack.
    Includes physical material properties model (insulating or conductive or resistive or semiconducting) for "component" creation.
    Use this for netlisting and DRCs.  Use this as basis for buried vias, buried resistive elements, buried parallel
    plate capacitors, buried dielectric material zones, buried or surface contact materials, surface contact plating specs,
    stacked component netlisting, forward and back annotation.

3D physical is mostly a layout/fabbing design data, but some hints about bits can go in schematics as attribs.

For instance, stacked components being colocated, a component being "layed out" in place rather than placed, which middle layers
that wires go on for shielding purposes...

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