def get_objective_bank_lookup_session(self):
raise Unimplemented()<EOL>
Gets the OsidSession associated with the objective bank lookup service.

        return: (osid.learning.ObjectiveBankLookupSession) - an
                ``ObjectiveBankLookupSession``
        raise:  OperationFailed - unable to complete request
        raise:  Unimplemented - ``supports_objective_bank_lookup() is
                false``
        *compliance: optional -- This method must be implemented if
        ``supports_objective_bank_lookup()`` is true.*