anchor.diff:  -export([required_arguments/0, optional_arguments/0, exclusive_arguments/0,
       required_response_elements/0, optional_response_elements/0, get_response/2]).
   
  +
  +%%%===================================================================
  +%%% API
  +%%%===================================================================
   
   %%%-------------------------------------------------------------------
   %%% @doc
  
positive.code: %% TODO do we need description ???
  
  
  
negative.code: get_response(<<"protocolVersion">>, _Args) ->
      ?PROTOCOL_VERSION;
  get_response(<<"earliestDatestamp">>, _Args) ->
      oai_utils:datetime_to_oai_datestamp(get_earliest_datestamp());
  get_response(<<"deletedRecord">>, _Args) ->
      <<"no">>;
  get_response(<<"granularity">>, _Args) ->
  