public XPathDescendantIterator(XPathDescendantIterator copy) : base (copy)
		{
			this.depth = copy.depth;
			this.finished = copy.finished;
		}
 public XPathDescendantIterator(XPathDescendantIterator it) : base(it) {
     this.level = it.level;
 }
 public XPathDescendantIterator(XPathDescendantIterator it) : base(it)
 {
     _level = it._level;
 }