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