t expression are listed below:</p>
</font>

<table BORDER="1" CELLSPACING="1" CELLPADDING="7" WIDTH="590">
  <tr>
    <td WIDTH="24%" VALIGN="TOP"><font SIZE="2"><b>Expression</b></font></td>
    <td WIDTH="76%" VALIGN="TOP"><font SIZE="2"><b>Meaning</b></font></td>
  </tr>
  <tr>
    <td WIDTH="24%" VALIGN="TOP"><font SIZE="2">XXX</font></td>
    <td WIDTH="76%" VALIGN="TOP"><font SIZE="2">Process all immediate child elements with tag XXX</font></td>
  </tr>
  <tr>
    <td WIDTH="24%" VALIGN="