<td class="paramname"> <em>entityReferenceExpansion</em></td><td>&nbsp;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td><td><code> [pure virtual]</code></td>
        </tr>
      </table>
</div>
<div class="memdoc">

<p>
Creates a TreeWalker object. 
<p>
(DOM2)<p>
TreeWalker objects are used to navigate a document tree or subtree using the view of the document defined by its whatToShow flags and any filters that are defined for the TreeWalker. Any function