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Date:	Thu, 9 Jul 2015 19:32:30 -0400
Message-Id:	<201507092332.t69NWUEN006109@envy.delorie.com>
From:	DJ Delorie <dj AT delorie DOT com>
To:	geda-user AT delorie DOT com
In-reply-to:	<559EFE69.1040601@zoot.drehmel.com> (message from Robert Drehmel
	on Fri, 10 Jul 2015 01:06:17 +0200)
Subject:	Re: [geda-user] Back annotation
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> How do you think this mapping tool should get the data from the schematic -
> via a special scheme netlist script or by reading the schematic file itself?

Nothing should read the schematic itself.  I thought of two ways:

1. The various tools that deal with attributes also know about
   "implied" attributes, which are the result of database and ruleset
   queries.  Thus, in gschem's attribute window you'd have access to
   the database as well as user-specified attributes.  This lets the
   user override the rules while still having the convenience of a
   database.

2. The netlister would need to feed its data into some sort of engine
   that combines the specific attributes with implied ones, adds in
   other external data and/or back-annotation data, and produce
   whatever the backend needs.

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