1. @override
Map save()

Save this node into a map.

Source 

@override
Map save() {
  var out = super.save();
  out.remove("lwv");
  out.remove("startDate");
  out.remove("endDate");
  out.remove("getHistory");
  out.remove("publish");

  while (onSaveCallbacks.isNotEmpty) {
    onSaveCallbacks.removeAt(0)(out);
  }

  return out;
}