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Subject: Re: [geda-user] Hierarchical Schematics
From: John Doty <jpd AT noqsi DOT com>
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Date: Thu, 30 Jul 2015 18:30:57 -0400
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On Jul 30, 2015, at 6:08 PM, Edward Hennessy (ehennes AT sbcglobal DOT net) [via geda-user AT delorie DOT com] <geda-user AT delorie DOT com> wrote:

> 
>> What is a dag?
> 
> Directed Acyclic Graph. In this scenario, a subsheet/page could have more than one parent.
> 
> So, could a subsheet/page be instantiated in more that one schematic in the same design?

Yes. But gschem doesn’t edit designs, it edits schematic pages. There is no requirement that pages open in gschem have any affinity at all, or that all pages in a design be open at once. A particular page may be part of more than one design, too. As I said, what actually happens is that the hierarchy you see in the page manager represents the most recent access path for the subsheets.

As for gnetlist, each instance is unique even if the sources are not. The result is effectively a tree. An expanded netlist contains components and nets with unique names representing the tree structure.

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