def get_objective_bank_node_ids(self,<EOL>objective_bank_id=None,<EOL>ancestor_levels=None,<EOL>descendant_levels=None,<EOL>include_siblings=None):
pass<EOL>
Gets a portion of the hierarchy for the given objective bank.

        arg:    includeSiblings (boolean): true to include the siblings
                of the given node, false to omit the siblings
        return: (osid.hierarchy.Node) - a catalog node
        raise:  NotFound - objectiveBankId not found
        raise:  NullArgument - objectiveBankId is null
        raise:  OperationFailed - unable to complete request
        raise:  PermissionDenied - authorization failure
        compliance: mandatory - This method must be implemented.