firebase - Meaning of `?.` in Flutter with respect to RemoteMessage

Question

https://pub.dev/documentation/firebase_messaging_platform_interface/latest/firebase_messaging_platform_interface/RemoteMessage/RemoteMessage.html

RemoteMessage does have a field called notification.
But what does it mean when we say: message.notification?.title?

? means that the field can be null but when we say ?.title, does it mean that there is a title field in notification which we are trying to access?

https://blog.logrocket.com/flutter-push-notifications-with-firebase-cloud-messaging/

   FirebaseMessaging.onMessage.listen((RemoteMessage message) {
      // Parse the message received
      PushNotification notification = PushNotification(
        title: message.notification?.title,
        body: message.notification?.body,
      );
   }

Answer 1

Waitting for answers