anchor.diff:  -spec set_param(atom(), term()) -> ok.
   
   set_param(Param, Value) ->
  -    application:set_env(?APPLICATION, Param, Value).
  +    application:set_env(yamerl, Param, Value).
   
   -spec check_and_set_param(atom(), term()) -> ok.
   
  
positive.code:     config_change/3
    ]).
  
  -define(APPLICATION, yamerl).
  
  %% -------------------------------------------------------------------
  %% Configuration API.
  %% -------------------------------------------------------------------
  
negative.code:             do_start(Rest);
          false ->
              Message = io_lib:format(
                "yamerl: invalid application configuration~n", []),
              {error, invalid_configuration, Message}
      end;
  do_start([preload_core_schema_mods | Rest]) ->
  