public function insertAfter($sAfter, $sTag, $sId)
    {
        return $this->addCommand(
            array(
                'cmd' => 'ia',
                'id' => trim((string)$sAfter, " \t"),
                'prop' => trim((string)$sId, " \t")
            ),
            trim((string)$sTag, " \t\n")
        );
    }