anchor.diff:                      {url, Url, _TagOptions, _ImageOptions} = url1(Filename, Options, Context),
                       {ok, Url};
                   _ ->
  -                    {ok, []}
  +                    {ok, <<>>}
               end;
           Filename -> 
               {url, Url, _TagOptions, _ImageOptions} = url1(Filename, Options, Context),
  
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:     filename:join("/image/", Filename).
  
  
  %% @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};
  