anchor.diff:  	 %% retrieve
   	 to_key_val/1,
   	 find/2,
  -	 
  +
   	 %% update
   	 add/2,
   	 add/3,
   	 rm/2,
   
  -	 %% XXX should there be test code ? contact_param.erl and 
  +	 %% XXX should there be test code ? contact_param.erl and
   	 %% url_param.erl current do the testing
   	 test/0
   	]).
  
positive.code: %% this module is used by contact_param.erl and url_param.erl
  %% to ensure that their entries are unique and can be accessed 
  %% efficiently.
  %% The current implementation handles any kind of key-value pairs
  %% but, the current yxa code mostly uses string() and in some cases
  %% 'none' when there is no value to enter for a key-value pair. 
  %%
  %% Note: add is implemented in a simplistic manner, time consumption is 
  %% O(N) (N is the current size of the DB) - but considering the 
  %% small size of the parameter DBs created, this may actualy be an 
  %% advantage because most other solutions are likely to have a greater
  %% overhead, making them slower for small DBs.
  %%
  
negative.code: %%====================================================================
  
  %%--------------------------------------------------------------------
  %% Function:
  %%           KeyValList = list() of {Key, Val}
  %%           Key, Val = term()
  %% Descrip.:
  %% Returns :
  %%--------------------------------------------------------------------
  new() ->
      [].
  