def get_proficiency_notification_session_for_objective_bank(self, proficiency_receiver=None, objective_bank_id=None):
if proficiency_receiver is None:<EOL><INDENT>raise NullArgument<EOL><DEDENT>if objective_bank_id is None:<EOL><INDENT>raise NullArgument<EOL><DEDENT>raise Unimplemented()<EOL>
Gets the ``OsidSession`` associated with the proficiency notification service for the given objective bank.

        arg:    proficiency_receiver
                (osid.learning.ProficiencyReceiver): the notification
                callback
        arg:    objective_bank_id (osid.id.Id): the ``Id`` of the
                ``ObjectiveBank``
        return: (osid.learning.ProficiencyNotificationSession) - a
                ``ProficiencyNotificationSession``
        raise:  NotFound - no objective bank found by the given ``Id``
        raise:  NullArgument - ``proficiency_receiver`` or
                ``objective_bank_id`` is ``null``
        raise:  OperationFailed - unable to complete request
        raise:  Unimplemented - ``supports_proficiency_notification()``
                or ``supports_visible_federation()`` is ``false``
        *compliance: optional -- This method must be implemented if
        ``supports_proficiency_notification()`` and
        ``supports_visible_federation()`` are ``true``*