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as per Nick http://gramps.1791082.n4.nabble.com/Serialize-and-Pickle-tp4675852p4675864.html
Gramps uses the pickle module to serialise object hierarchies and store them in the database.
Details of the pickle module can be found here:
* https://docs.python.org/3/library/pickle.html
Below is a diagram of the Gramps data model (v4.1)
Primary objects are coloured blue. Secondary objects are coloured black. The dotted lines enclose object hierarchies that are stored in
the database tables.
[[File:GrampsDataModel.svg|1024px]]