anchor.diff:      filename:join("/image/", Filename).
   
   
  -%% @spec url(MediaRef, Options, Context) -> {ok, Url} | {error, Reason}
  +%% @spec url(MediaRef, Options, Context) -> {ok, Url::binary()} | {error, Reason}
   %% @doc Generate the url for the image with the filename and options
   url(undefined, _Options, _Context) ->
       {error, enoent};
  
positive.code:                 {ok, Filename} ->
                      {url, Url, _TagOptions, _ImageOptions} = url1(Filename, Options, Context),
                      {ok, Url};
                  _ -> {ok, []}
              end
      end;
  url([{_Prop, _Value}|_] = Props, Options, Context) ->
  
negative.code:                     {url, Url, _TagOptions, _ImageOptions} = url1(Filename, Options, Context),
                      {ok, Url};
                  _ ->
                      {ok, <<>>}
              end;
          Filename -> 
              {url, Url, _TagOptions, _ImageOptions} = url1(Filename, Options, Context),
  