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Subject: Re: [geda-user] Trace width - best practices?
From: John Doty <jpd AT noqsi DOT com>
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Date: Sat, 27 Oct 2012 17:23:40 -0600
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On Oct 27, 2012, at 5:00 PM, Kai-Martin Knaak wrote:

> John Doty <jpd AT noqsi DOT com> schrieb am 25. October 2012:
> 
>> I don't see why it would require file format modification. We can
>> attach arbitrary attributes to net segments already.
> 
> Adding attributes that are supposed to be interpreted _is_ a format
> modification. Unlike completely new syntax lines, pcb does not quit
> processing a layout with unknown attributes. Of course, it cannot
> interpret the attribute the way they were meant to be. Depending on
> cirumstances, the result can be begnin or rather unexpected.

I was speaking of the schematic file format. Attributes attached to net segments may be of use to other downstream tools beside pcb, especially simulation. The details of how each downstream flow interprets optional attributes are not part of the file format. It is useful to have common conventions, but it seems impossible to have universal rules here. 

John Doty              Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd AT noqsi DOT com