anchor.diff:            line of the file should contain two fields, separated by whitespace.
             The first field is the mime type, the second is a file extension.
             For example:
  -          video/x-ms-wmx                    wmx
  +<programlisting>
  +video/x-ms-wmx  wmx
  +</programlisting>
             If the file is not found, some simple defaults will be used.
           '';
         };
  
positive.code:         type = types.bool;
          default = true;
          description = ''
            If yes, all HTML (including that produced by pandoc) is filtered
            through xss-sanitize.  Set to no only if you trust all of your users.
          '';
        };
  
negative.code:         default = null;
          description = ''
            The base URL of the wiki, to be used in constructing feed IDs and RPX
            token_urls.  Set this if useFeed is false or authentication-method
            is 'rpx'.
          '';
        };
  