anchor.diff:  %% Mnesia Callbacks
   %%--------------------------------------------------------------------
   
  -%% @doc Create Trie Tables.
  +%% @doc Create or Replicate trie tables.
   -spec mnesia(boot | copy) -> ok.
   mnesia(boot) ->
       %% Trie Table
  
positive.code:                 {record_name, trie_node},
                  {attributes, record_info(fields, trie_node)}]);
  
  %% @doc Replicate trie tables.
  mnesia(copy) ->
      %% Copy Trie Table
      ok = emqttd_mnesia:copy_table(trie),
  
negative.code:     ok = emqttd_mnesia:copy_table(trie_node).
  
  %%--------------------------------------------------------------------
  %% Trie API
  %%--------------------------------------------------------------------
  
  %% @doc Insert topic to trie tree.
  