anchor.diff:  %%--------------------------------------------------------------------
   %% Function: from_list(List)
   %%           List = list() of {Key, Item}
  -%% Descrip.: create a empty keylist and add the List elements with 
  +%% Descrip.: create a empty keylist and add the List elements with
   %%           append/2
   %% Returns : keylist record()
   %%--------------------------------------------------------------------
  
positive.code: %% External exports
  %%--------------------------------------------------------------------
  -export([
  	 fetch/2, 
  	 from_list/1, 
  	 append/2, 
  	 prepend/2,
  	 delete/2, 
  	 deletefirstvalue/2, 
  	 set/3, 
  	 copy/2, 
  	 appendlist/2, 
  	 map/2
  	]).
  
  
negative.code: 
  %%--------------------------------------------------------------------
  %% Function: deletefirstvalue(Key, List)
  %%           Key = string(), the name of a field in a sip message
  %%           List = keylist record()
  %% Descrip.: remove the first entry from a element (#keyelem.item)
  %%           in keylist record() (#keylist.list)
  %% Returns : keylist record()
  %%--------------------------------------------------------------------
  