</row>
</tbody>
</tgroup>
- </table>
+ </table>
+ <table frame="topbot" rowsep="0" colsep="0" role="grammar">
+ <title>symbol</title>
+ <tgroup cols="4">
+ <tbody>
+ <row>
+ <entry id="grammar.symbol">&symbol;</entry>
+ <entry>::=</entry>
+ <entry><emphasis role="bold">〈〈None of the above〉〉</emphasis></entry>
+ </row>
+ </tbody>
+ </tgroup>
+ </table>
</sect2>
<sect2 id="terms">
<title>Terms</title>