anchor.diff:  
   
   %% @doc Unescape - reverses the effect of escape.
  -%% @spec escape(iolist()) -> iolist()
  +%% @spec escape(iolist()) -> binary()
   unescape(undefined) -> 
       undefined;
   unescape(<<>>) -> 
       <<>>;
   unescape([]) ->
  -    [];
  +    <<>>;
   unescape(L) when is_list(L) ->
       unescape(list_to_binary(L));
   unescape(B) when is_binary(B) ->
  
positive.code: 	nows([$\\|T], Acc) -> nows(T, Acc);
  	nows([C|T], Acc) -> nows(T, [C|Acc]).
  
  
negative.code: 
  
  %% @doc Escape a string so that it is valid within HTML/ XML.
  %% @spec escape(iolist()) -> binary()
  escape(undefined) -> 
      undefined;
  escape(<<>>) -> 
      <<>>;
  escape([]) ->
      <<>>;
  escape(L) when is_list(L) ->
      escape(list_to_binary(L));
  escape(B) when is_binary(B) ->
  