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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 recently did a tiny bit of work on the parser in pcb.  Of course we
> should continue to support it, but it's going to be tough to extend it
> much.  It's already overloaded in weird ways (e.g. thermals are parsed as
> flags, with their own non-flex sub-syntax, even though they don't set any
> actual flags).  If you do extend it you do hard work and still only pcb can
> read it.  Of course you still have to teach the innards of pcb about your
> extensions in order for them to do anything useful.

A good start might be to write down what need to be stored even though they are not implemented right now and maybe never will be:
  1. Padstack, probably as collection of ordinary drawing primitives.
  2. Local copy and reference so update is possible.
  3. Net and possible segment attribute for route style, width.
  4. Net clerances between any net.
  5. Net clerance classes although (4.) could be extended before entering pcb.
  6. Trace impedance.
  7. Differential impedance?
  8. Pin swapping!
  9. Slot swapping.

> ... Speaking for myself, I
> prefer softwares to spit out a big fat FAIL message and quit, than to
> silently try to work when they cannot guarantee correct operation.

Indeed it is, I tried visual basic or is it this they call C# and it just continue.


Nicklas Karlsson