   customization point for all elements of the tuple.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <code class="computeroutput"><span class="identifier">unused_type</span></code>
                  </p>
                </td>
<td>
                  <p>
                    Do nothing.
                  </p>
                </td>
</tr>
</tbody>
</table></div>
<h6>
<a name="spirit.advanced.customize.clear_value.h7"></a>
          <span class="phrase"><a n