Inheritance: ResetableIterator
 public XPathMultyIterator(XPathMultyIterator it) {
     this.arr           = (ResetableIterator[]) it.arr.Clone();
     this.firstNotEmpty = it.firstNotEmpty;
     this.position      = it.position;
 }
 public XPathMultyIterator(XPathMultyIterator it)
 {
     this.arr           = (ResetableIterator[])it.arr.Clone();
     this.firstNotEmpty = it.firstNotEmpty;
     this.position      = it.position;
 }