public function toXml()
 {
     $xml = '<?xml version="1.0" encoding="UTF-8"?>' . "\n" . '<ProcessOrders xmlns="http://plazaapi.bol.com/services/xsd/plazaapiservice-1.0.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://plazaapi.bol.com/services/xsd/plazaapiservice-1.0.xsd plazaapiservice-1.0.xsd ">' . "\n";
     // Shipments
     if (count($this->OrderTransaction['Shipments']) > 0) {
         $xml .= "\t<Shipments>\n";
         foreach ($this->OrderTransaction['Shipments'] as $shipment) {
             $xml .= "\t\t<Shipment>\n";
             $xml .= Tools::arrayToXML($shipment, 3);
             $xml .= "\t\t</Shipment>\n";
         }
         $xml .= "\t</Shipments>\n";
     }
     // Cancellations
     if (count($this->OrderTransaction['Cancellations']) > 0) {
         $xml .= "\t<Cancellations>\n";
         foreach ($this->OrderTransaction['Cancellations'] as $cancellation) {
             $xml .= "\t\t<Cancellation>\n";
             $xml .= Tools::arrayToXML($cancellation, 3);
             $xml .= "\t\t</Cancellation>\n";
         }
         $xml .= "\t</Cancellations>\n";
     }
     $xml .= '</ProcessOrders>';
     die($xml);
     return $xml;
 }