public function toXMLString()
{
$str = '';
$str .= '<ns:DoUATPAuthorizationReq>';
if ($this->DoUATPAuthorizationRequest != null) {
$str .= '<ns:DoUATPAuthorizationRequest>';
$str .= $this->DoUATPAuthorizationRequest->toXMLString();
$str .= '</ns:DoUATPAuthorizationRequest>';
}
$str .= '</ns:DoUATPAuthorizationReq>';
return $str;
}