1. @override
void load(Map m)

Load this node from the provided map as m.

Source 

@override
void load(Map m) {
  super.load(m);

  if (m["?json"] != null) {
    init(m["?json"]);
  }

  if (m["?_json"] != null) {
    updateJsonValue(m["?_json"]);
  }
}