1.2 关键字</a>
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        <li class="tocline4"><a href="syndata.html#vendor-keywords" class="tocxref">4.1.2.1 特定供应商（Vendor-specific）扩展</a>
        <li class="tocline4"><a href="syndata.html#vendor-keyword-history" class="tocxref">4.1.2.2 信息性历史记录</a>
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      <li class="tocline3"><a href="syndata.html#characters" class="tocxref">4.1.3 字符和大小写</a>
      <li class="tocline3"><a href="syndata.html#statements" class="tocxref">4.1.4 语句