s="pdat">4
            hexadecimal digits</span> although UTF-8 encoding is also fine</li>
          <li>No other back-slash escape combinations are allowed although \b \f
          \n \r and \t will be understood by the parser for the purpose of giving
          a better error message.</li>
          <li>Maximum length of 40 unicode characters (not bytes) after removing 
          the surrounding double-quotes and converting all escape sequences</li>
          <li>The comment character # will be ignored wi