public DTMAxisIterator cloneIterator() {
_isRestartable = false;
final HeapNode[] heapCopy = new HeapNode[_heap.length];
try {
MultiValuedNodeHeapIterator clone = (MultiValuedNodeHeapIterator) super.clone();
for (int i = 0; i < _free; i++) {
heapCopy[i] = _heap[i].cloneHeapNode();
}
clone.setRestartable(false);
clone._heap = heapCopy;
return clone.reset();
} catch (CloneNotSupportedException e) {
BasisLibrary.runTimeError(BasisLibrary.ITERATOR_CLONE_ERR, e.toString());
return null;
}
}