de class="computeroutput"><span class="keyword">void</span><span class="special">(</span><span class="identifier">Attrib</span><span class="special">&amp;,</span> <span class="identifier">Context</span><span class="special">&amp;,</span> <span class="keyword">bool</span><span class="special">&amp;)</span></code>. The third parameter is a boolean
                flag that can be set to false to force the generator to fail. Both
                <code class="computeroutput"><span class="identifier">Context</sp