Thanks Marzia. For now I've got a method that loops over the possible
classes looking for the one with the ID I'm after:

    def get_entry(id):
        for c in [ TextEntry, BinaryEntry, Entry ]:
            entry = c.get_by_id(id)
            if entry != None:
                return entry
        return entry

Although not the most efficient way of doing it, it seems to work.

Craig
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