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2 """ This class provides access to the underlying data model.
5 def open(self, filename):
6 """ Open file and read first event.
8 raise NotImplementedError
16 """ Go to event number index and read it.
18 raise NotImplementedError
21 """ Return the current event number.
23 raise NotImplementedError
26 """ Return the total number of events.
28 raise NotImplementedError