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Date: Sat, 26 Dec 2015 22:05:53 +0100
From: "Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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Subject: Re: [geda-user] A fileformat library
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>  > I’m not talking about pcb. I’m talking about geda-gaf. Geda-gaf is a much cleaner design. The pcb format doesn’t even represent a
>  > proper model of what a printed circuit board is.
> 
> Not talking about PCB doesn't solve many wants for very many people, so I want to talk about PCB, but yeah, its data model is 
> spaghetti, and needs rework.

There is a need for:
  1. Update of footprints and vias.
  2. Define standard reausable pads/pins/vias which may be updated if changed.
  3. Clearance values between nets.
  4. Net and maybe segment copper width.

1. Embedded footprint is good if library is changed but to able to update is rather important.
2. Packages like: SO, LQFP, DIP, ... usually have several pins and come in different sizes. First pin is usually also different and som packages may have more than one different pins.
3. Example rectified line voltage negative net: Clearance to logic with negative voltage as ground, clearance to PE, clearance to rectified positive voltage, controlled impedance, ...

Nicklas Karlsson