_source = source;
return _source.cloneIterator();
return _source.getNode(pos);
return _index == 0 ? 1 : _index;
_source.gotoMark();
return _source.getNode(_index++);
_index = 0; return this;
_source.setMark();
//_isRestartable = isRestartable; //_source.setRestartable(isRestartable);
return this;