anchor.diff:  %% @author Maik Lange <malange@informatik.hu-berlin.de>
   %% @doc    Approximate Reconciliation Tree (ART) implementation
   %%         Represents a packed merkle tree.
  -%%         SRC: 2002 - J.Byers, J.Considine, M.Mitzenmachen
  +%% @end
  +%% @reference
  +%%         2002 - J.Byers, J.Considine, M.Mitzenmachen
   %%              Fast Approximate Reconcilication of Set Differences
   %%              - BU Computer Science TR
   %% @end
  
positive.code: % @copyright 2011 Zuse Institute Berlin
  %
  %   Licensed under the Apache License, Version 2.0 (the "License");
  %   you may not use this file except in compliance with the License.
  
negative.code: 
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  -spec new() -> art().
  new() -> 
      {art, default_art_config(), intervals:empty(), empty, empty}.
  
  -spec new(merkle_tree:merkle_tree()) -> art().
  new(Tree) ->
  