anchor.diff:              ]}} | Acc]
           end, [], Metadata).
   
  +% Translate a metadata value into jiffy format.
   json_metadata(true) ->
       true;
   json_metadata(false) ->
  
positive.code:                 [{Key, json_metadata(Value)} | Acc]
              end, [], Data)
      }.
  
  
  % ==============================================================================
  % import helper functions
  
negative.code: % The only supported formats are `json' and `json0'.
  %
  % `json0' is a backward compatible importer.  Use this for the first
  % version of the export files that does not have publisher id or
  % publish timestamps on metadata.
  % @end
  -spec import(Format :: json | json0, string()) -> ok | {error, reason()}.
  import(Format, Filename) ->
  