/**
* Removes all data from this storage
*/
public function clear()
{
$this->items = [];
$this->aliases->clear();
$this->hierarchy->clear();
}
/**
* Returns if an iterator can be created for the current entry.
* @return bool true if the current entry can be iterated over, otherwise returns false.
*/
public function hasChildren()
{
return !$this->_children->isEmpty();
}