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From: John Griessen <john AT ecosensory DOT com>
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Date: Wed, 27 Jan 2016 10:43:42 -0600
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On 01/26/2016 03:02 PM, Stephan Böttcher wrote:
>   It should be something like "expess
> Elements and Vias as subclasses of generic containers that can include
> anything".  It should be steps that allow to do anything that may come
> up in the future that can be expressed in (Gerber) layers.

Yes.

On 01/26/2016 04:35 PM, Britton Kerin (britton DOT kerin AT gmail DOT com) [via geda-user AT delorie DOT com] wrote:
 > So you guys actually want a more strongly typed system.


Isn't PCB already strongly typed and we'd lie a couple extra types?  Isn't outline, that chops
the extents of a layer, a type?  Not sure of the terminology type.

Layers can be 2D and valuable, and maybe they should be redefined to mean "corresponding to
physical stack up layers of material that comes in sheets, or is plated or printed on a plane.

The vertical via walls of plated metal would not be part of a layer, just inferred.

outline would act on layers, but not be one.

Attributes galore can help layers model physical reality, such that someone could extract/infer/construct a CSG
3D model from it if they wanted to.