note 47348 added to ref.xsl

me sale error a ejecutar el siguiente codigo: <?php $xml = new DomDocument; $xml->load('menu.xml'); $xsl = new DomDocument; $xsl->load('menu.xsl'); $proc = new xsltprocessor; $proc->importStyleSheet($xsl); echo $proc->transformToXML($xml); ?> no se si necesito algun parser para ejecutar este codigo que me dice en el error que no existe la clase DomDocument...tengo instalado el apache 1.3.29 t el php 4.0 ... ---- Manual Page -- http://www.php.net/manual/en/ref.xsl.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+47348 Delete -- http://master.php.net/manage/user-notes.php?action=delete+47348&report=yes Reason: bad code -- http://master.php.net/manage/user-notes.php?action=delete+47348&report=yes&reason=bad+code Reason: spam -- http://master.php.net/manage/user-notes.php?action=delete+47348&report=yes&reason=spam Reason: useless example -- http://master.php.net/manage/user-notes.php?action=delete+47348&report=yes&reason=useless+example Reason: contains commercial links -- http://master.php.net/manage/user-notes.php?action=delete+47348&report=yes&reason=contains+commercial+links Reason: useless note -- http://master.php.net/manage/user-notes.php?action=delete+47348&report=yes&reason=useless+note Reject -- http://master.php.net/manage/user-notes.php?action=reject+47348&report=yes Search -- http://master.php.net/manage/user-notes.php