    for the string
      "<code>HTML</code>".</li>
      <li>One or more
      <a href="terminology.html#space" id="space_xref12">space characters</a>.</li>
      <li>Any
      <a href="terminology.html#case-insensitive" id="case-insensitive_xref10">case-insensitive match</a>
      for the string
      "<code>SYSTEM</code>".</li>
      <li>One or more
      <a href="terminology.html#space" id="space_xref13">space characters</a>
</li>
      <li>A <i>quote mark</i>, consisting of either
      a
      "<code t