protected override QilNode VisitAncestorOrSelf(QilUnary ndAnc) {
CreateFilteredIterator(ndAnc.Child, "$$$iterAnc", typeof(AncestorIterator), XmlILMethods.AncCreate, XmlILMethods.AncNext,
XmlNodeKindFlags.Any, null, TriState.True, null);
return ndAnc;
}