public XPathDocumentDescendantOrSelfIterator(XPathDocumentDescendantIterator it) : base(it) {}
public XPathDocumentDescendantIterator(XPathDocumentDescendantIterator it) {
this.nav = (XPathDocumentNavigator) it.nav.Clone();
this.name = it.name;
this.uri = it.uri;
this.level = it.level;
this.position = it.position;
}
