 tree </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>whatToShow</em>&nbsp;</td><td>This attribute determines which node types are presented via the iterator. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>filter</em>&nbsp;</td><td>The filter used to screen nodes </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>entityReferenceExpansion</em>&nbsp;</td><td>The value of this flag determines whether the children of entity reference nodes are visible to the iterator. If 