[Vysper] PubSub question

[Matus Zamborsky]

Last day I went through PubSub XEP, and also tried to find some info on 
web. One thing I am not sure I understand correctly is, that according 
to pubsub specification you dont have a way to get all nodes where you 
are subscribed. Image that in federated architecture, quite a nightmare. 
So unless you save your subscribtions externaly or maybe use private 
storage, you dont have a way to know where you are subscribed. Do you 
know what is the standard way of doing this(maybe the private storage) 
or am I missing something?