anchor.diff:  %% Function: add(UrlParam, Key, Value)
   %%           add(UrlParam, Key)
   %%           UrlParam = url_param record(), the record to update
  -%%           Key      = string(), treated as case insensetive
  -%%           Value    = string(), treated as case insensetive
  +%%           Key      = string(), treated as case insensitive
  +%%           Value    = string(), treated as case insensitive
   %% Descrip.: add new entry or replace old entry in url_param. Key and
  -%%           Value are stored in a case insensetive manner
  +%%           Value are stored in a case insensitive manner
   %% Returns : url_param record()
   %%--------------------------------------------------------------------
   add(UrlParam, Key) ->
  
positive.code: %%--------------------------------------------------------------------
  %% Function: to_norm(Params)
  %%           Params = list() of string(), each string is a "name=val" 
  %%           pair or a single "name" value and may contain %HH hex 
  %%           escape codes - they are treated as case insensetive
  %% Descrip.: convert a uri-parameter list to a normalized (a non case 
  %%           sensitive form) form
  %% Returns : url_param record() | 
  
negative.code: %--------------------------------------------------------------------
  %% Function: find(Param, Key)
  %%           Param = url_param record(), the record to update
  %%           Key   = string(), is treated as case insensitive
  %% Descrip.: retrive the value of Key if it is contained in Param
  %% Returns : [string()] | []
  %%--------------------------------------------------------------------
  