262      * @param string|null $subclassName The GraphNode subclass to cast to.
271     public function getGraphObject($subclassName = null)  argument
273         return $this->getGraphNode($subclassName);
279      * @param string|null $subclassName The GraphNode subclass to cast to.
285     public function getGraphNode($subclassName = null)  argument
289         return $factory->makeGraphNode($subclassName);
379      * @param string|null $subclassName The GraphNode subclass to cast list items to.
389     public function getGraphList($subclassName = null, $auto_prefix = true)  argument
391         return $this->getGraphEdge($subclassName, $auto_prefix);
397      * @param string|null $subclassName The GraphNode subclass to cast list items to.
404     public function getGraphEdge($subclassName = null, $auto_prefix = true)  argument
408         return $factory->makeGraphEdge($subclassName, $auto_prefix);