def get_objective_sequencing_session_for_objective_bank(self, objective_bank_id=None):
if not objective_bank_id:<EOL><INDENT>raise NullArgument<EOL><DEDENT>if not self.supports_objective_sequencing():<EOL><INDENT>raise Unimplemented()<EOL><DEDENT>try:<EOL><INDENT>from . import sessions<EOL><DEDENT>except ImportError:<EOL><INDENT>raise OperationFailed()<EOL><DEDENT>try:<EOL><INDENT>session = sessions.ObjectiveSequencingSession(objective_bank_id, runtime=self._runtime)<EOL><DEDENT>except AttributeError:<EOL><INDENT>raise OperationFailed()<EOL><DEDENT>return session<EOL>
Gets the OsidSession associated with the objective sequencing
        service for the given objective bank.

        arg:    objectiveBankId (osid.id.Id): the Id of the objective
                bank
        return: (osid.learning.ObjectiveSequencingSession) - an
                ObjectiveSequencingSession
        raise:  NotFound - objectiveBankId not found
        raise:  NullArgument - objectiveBankId is null
        raise:  OperationFailed - unable to complete request
        raise:  Unimplemented - supports_objective_sequencing() or
                supports_visible_federation() is false
        compliance: optional - This method must be implemented if
                    supports_objective_sequencing() and
                    supports_visible_federation() are true.