8 string identifier stored in ``ir.model.data``, can be used to refer
9 to a record regardless of its database identifier during data imports
10 or export/import roundtrips.
12 External identifiers are in the form :samp:`{module}.{id}` (e.g.
13 ``account.invoice_graph``). From within a module, the
14 :samp:`{module}.` prefix can be left out.