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<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../images/note.png"></td>
<th align="left">Note</th>
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<tr><td align="left" valign="top"><p>
            In addition to their usual attribute of type <code class="computeroutput"><span class="identifier">Attrib</span></code>
            all listed generators accept an instance of a <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">optional</s