_notification_subject = f.optional_string_child("NotificationSubject").get_value_or(_("DCP-o-matic notification"));
_notification_from = f.optional_string_child("NotificationFrom").get_value_or("");
_notification_to = f.optional_string_child("NotificationTo").get_value_or("");
_notification_subject = f.optional_string_child("NotificationSubject").get_value_or(_("DCP-o-matic notification"));
_notification_from = f.optional_string_child("NotificationFrom").get_value_or("");
_notification_to = f.optional_string_child("NotificationTo").get_value_or("");