anchor.diff:  %%--------------------------------------------------------------------
   %% Function: from_list(List)
   %%           List = list() of {Key, Item}
  -%% Descrip.: create a empty keylist and add the List elements with
  +%% Descrip.: create an empty keylist and add the List elements with
   %%           append/2
   %% Returns : keylist record()
   %%--------------------------------------------------------------------
  
positive.code: 
  %%--------------------------------------------------------------------
  %% Function: delete(Key, List)
  %%           Key = string(), the name of a field in a sip message
  %%           List = keylist record()
  %% Descrip.: remove a entry from keylist record() (#keylist.list)
  %% Returns : keylist record()
  %%--------------------------------------------------------------------
  delete(Key, List) when record(List, keylist) ->
  
negative.code: 
  %%--------------------------------------------------------------------
  %% Function: deletefirstvalue(Key, List)
  %%           Key = string(), the name of a header in a sip message
  %%           List = keylist record()
  %% Descrip.: remove the first entry from a element (#keyelem.item)
  %%           in keylist record() (#keylist.list)
  