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Date:	Tue, 13 Jul 2021 16:18:19 +0000
From:	"Peter Stuge (peter AT stuge DOT se) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To:	geda-user AT delorie DOT com
Subject:	Re: [geda-user] xorn details, perhaps
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John Doty wrote:
> > I've merely described that, and why, I find xorn and Python good choices.
> 
> What, exactly, is Xorn? I know what Python is.

Roland, please correct me if this is inaccurate.

I understand xorn to mean the C++, C and Python code that works with
instances of the expanded data model which covers all geda-gaf can do.

The C++ code is libxornstorage, which implements objects, attributes,
object revisions, selections along with common operations.

The C code bridges libxornstorage and Guile(!) to CPython.

The Python code is the gnetlist, gaf and xorn commands and all the
gnetlist backends, one of which (gnet_guile) uses the C bridge to Guile
to run an existing backend written in Scheme.

I understand that Roland has put significant effort into ensuring
that this last feature is reliably backwards compatible. I overlooked
the feature previously in this thread - sorry about that. :\


Kind regards

//Peter

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