anchor.diff:  %%--------------------------------------------------------------------
   casecompare(none, none) ->
       true;
  -casecompare(none, String) ->
  +casecompare(none, _String) ->
       false;
  -casecompare(String, none) ->
  +casecompare(_String, none) ->
       false;
   casecompare(String1, String2) ->
       S1 = httpd_util:to_lower(String1),
  
positive.code: 	    Pid ! Message,
  	    ok;
  	{false, Pid} when is_list(LogTag) ->
  	    logger:log(error, LogTag ++ "Can't send signal ~p to pid ~p - not alive or not pid", [Message, Pid]),
  	    error;
  	{false, Pid} ->
  	    error
      end.
  
  
negative.code: %% return error if Digit is a non-numerical char (or other type)
  digit(Digit) when is_integer(Digit), Digit >= $0, Digit =< $9 ->
      Digit - $0;
  digit(_Digit) ->
      error.
  
  
  