</span></code>).
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">lex_input</span></code>
                </p>
              </td>
<td>
                <p>
                  This policy obtains it's input by calling yylex(), which would
                  typically be provided by a scanner generated by <a href="http://flex.sourceforge.net/" target="_top">Flex</a>.
                  If you use this policy your 