def get_objective_objective_bank_session(self):
if not self.supports_objective_objective_bank():<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.ObjectiveObjectiveBankSession(runtime=self._runtime)<EOL><DEDENT>except AttributeError:<EOL><INDENT>raise OperationFailed()<EOL><DEDENT>return session<EOL>
Gets the session for retrieving objective to objective bank
        mappings.

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