private function addTrustee()
{
$ext = $this->createElement('extension');
$infdata = $this->createElement('keysys:update');
$domdata = $this->createElement('keysys:domain');
$cd = $this->createElement('keysys:de-accept-trustee-tac', '1');
$domdata->appendChild($cd);
$infdata->appendChild($domdata);
$ext->appendChild($infdata);
$this->getCommand()->appendChild($ext);
}