public function getIterator() {
        $iterator = new AppendIterator;

        if($this->wrapped_object instanceof IteratorAggregate) {
            $iterator->append($element->getIterator());
        }
        else {
            $iterator->append(new ArrayIterator($this->wrapped_object));
        }
        $iterator->append(parent::getIterator());
        return $iterator;
    }