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To: geda-user AT delorie DOT com
Subject: Re: Objects of objects (was Re: [geda-user] The state of gEDA/gaf (Was gEDA/PCBs diversity, Was: Pin hole size))
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Comments: In-reply-to Kai-Martin Knaak <kmk AT familieknaak DOT de>
   message dated "Thu, 01 Nov 2012 01:05:09 +0100."
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Date: Thu,  1 Nov 2012 13:41:35 +0100 (CET)
From: karl AT aspodata DOT se (Karl Hammar)
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Kai-Martin Knaak:
> John Doty wrote:
> > On Oct 31, 2012, at 3:07 AM, Karl Hammar wrote:
> For some reason, Karls post does not show in my reader...

Maybe I've been quiet, or what do you mean ?

> >>> The idea that objects are composed of objects composed of objects,
> >>> ... is missing.
> >> ...
> >> This kind of recursion is missing from gschem also, or rather from
> >> the sch/sym file formats.
> You _can_ put symbols into symbols.
...

Yes, but last time I raised the issue (see thread starting at [1])
it was considered a bug. And if you look at [2] it is specifically
forbidden. A first step would be to remove that ban.

> Real recursion would involve symbols that contain themselves. This can 
> only be meaningful if there is some kind of break condition. Infinite 
> recursion works only in pure mathematics... Can you give an example of 
> a use case where real recursion with a break condition would be 
> useful?

No, not now, but I see no reason to outlaw it.

Regards,
/Karl Hammar

[1] http://www.seul.org/pipermail/geda-user/2009-November/043669.html
[2] http://wiki.geda-project.org/geda:file_format_spec#component

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