function clear() {
		foreach($this->children as $c) {
			$c->parent = null;
			$c->delete();
		}
		$this->children = array();
	}
function clear() {
		foreach($this->children as $c) {
			$c->parent = null;
			$c->delete();
		}
		$this->children = array();
	}
Deletes all child nodes from node