er it is part of a
      <a href="syntax.html#permitted-public-ID-system-ID-combination" id="permitted-public-ID-system-ID-combination_xref1">permitted-public-ID-system-ID-combination</a>,
      the following parts, in exactly the following order:
        <ol>
<li>One or more
          <a href="terminology.html#space" id="space_xref9">space characters</a>.</li>
          <li>A <i>quote mark (system ID)</i>, consisting of either a
          "<code title="U+0022 QUOTATION MARK">"</code>"
          character o