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

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