protected override QilNode VisitPrecedingSibling(QilUnary ndPreSib) {
CreateFilteredIterator(ndPreSib.Child, "$$$iterPreSib", typeof(PrecedingSiblingIterator), XmlILMethods.PreSibCreate, XmlILMethods.PreSibNext,
XmlNodeKindFlags.Any, null, TriState.Unknown, null);
return ndPreSib;
}