anchor.diff:  -spec select_reply_data(PData::data(), Ref::pos_integer(), Round::round(),
       State::state()) -> {discard_msg | ok | retry | send_back, state()}.
   select_reply_data(_PData, _Ref, _Round, State) ->
  +    %% cy_subset msg <=> p2p_exch msg -> seleft_reply_data()
       {ok, State}.
   
   
   %% @doc Integrate the reply data. <br/>
  -%%      Called by the behaviour module upon a p2p_exch message. <br/>
  +%%      Called by the behaviour module upon a p2p_exch_reply message. <br/>
   %%      QData: the reply data from the peer <br/>
   %%      RoundStatus / Round: ignored, as cyclon does not implement round handling
   %%      Upon finishing the processing of the data, a message of the form
  
positive.code: %%      of the form {selected_data, Instance, ExchangeData}.
  -spec select_data(State::state()) -> {ok, state()}.
  select_data(State) ->
      {ok, State}.
  
  
  
negative.code: %%      Called by the gossip module upon {get_values_best} messages.
  -spec get_values_best(State::state()) -> {ok, state()}.
  get_values_best(State) ->
      %% use to implement get_subset_rand() api functions??
      {ok, State}.
  
  
  