" class="tocxref">4.1.9 注释</a>
    </ul>
    <li class="tocline2"><a href="syndata.html#parsing-errors" class="tocxref">4.2 处理解析错误的规则</a>
    <li class="tocline2"><a href="syndata.html#values" class="tocxref">4.3 值</a>
    <ul class="toc">
      <li class="tocline3"><a href="syndata.html#numbers" class="tocxref">4.3.1 整数和实数</a>
      <li class="tocline3"><a href="syndata.html#length-units" class="tocxref">4.3.2 长度</a>
      <li class="tocline3"><a href="syndata.html#per