python GnuCash interface to SQL backend

[Sébastien de Menten]

Hello John,

I have put at this address
https://github.com/sdementen/piecash/blob/master/docs/source/object_model.rst
what I understood from the object model of GnuCash
(schema/fields/invariants).
I have also added some questions regarding the objects for which you may
have the answer... (or these may be somewhere in GnuCash docs I could not
find)

I would be keen to get your opinion on this document.

kind regards,

Sebastien