public Document export(Document doc, Element root, Customer cus, List<CardBean> cards) {
    Element customer = doc.createElement("Kunde");
    root.appendChild(customer);

    Attr cusNum = doc.createAttribute("Kundennummer");
    cusNum.setValue(cus.getCustomernumber());
    customer.setAttributeNode(cusNum);

    Element cusName = doc.createElement("Name");
    cusName.appendChild(doc.createTextNode(cus.getName()));
    customer.appendChild(cusName);

    Iterator<CardBean> it = cards.iterator();
    while (it.hasNext()) {
      CardBean card = it.next();

      Element cusCard = doc.createElement("Karte");
      customer.appendChild(cusCard);

      Attr cardNum = doc.createAttribute("Kartennummer");
      cardNum.setValue(card.getCardNumber());
      cusCard.setAttributeNode(cardNum);

      Element telFirst = doc.createElement("Telefonnummer");
      telFirst.appendChild(doc.createTextNode(card.getPhoneString()));
      cusCard.appendChild(telFirst);
    }

    return doc;
  }
  /** @param args */
  public static void main(String[] args) {
    CustomerController cc = new CustomerController();
    List<DaoObject> customerList = cc.listObjects();
    List<String> customerNumbers = new ArrayList<String>();
    SearchCardController scc = new SearchCardController();
    try {
      DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
      DocumentBuilder docBuilder = docFactory.newDocumentBuilder();

      Document doc = docBuilder.newDocument();
      Element root = doc.createElement("Root");
      doc.appendChild(root);

      CustomersAndCardToXMLExporter exporter = new CustomersAndCardToXMLExporter();

      if (customerList != null && customerList.size() > 0) {
        System.out.println(customerList.size() + " Kunden gefunden");

        if (customerList.size() > 1) {
          Iterator it = customerList.iterator();
          while (it.hasNext()) {
            Customer cus = (Customer) it.next();
            String cNumber = cus.getCustomernumber();
            List<CardBean> cards = scc.performSearch(new Integer(cus.getId()));
            doc = exporter.export(doc, root, cus, cards);
          }
        }
      } else {
        System.out.println("Kein Customer gefunden");
      }

      TransformerFactory transformerFactory = TransformerFactory.newInstance();
      Transformer transformer = transformerFactory.newTransformer();
      DOMSource source = new DOMSource(doc);
      String dfs = "yyyy-MM-dd_HH-mm-ss";
      StreamResult result =
          new StreamResult(new File("C:\\temp\\Export-" + DateUtils.now(dfs) + ".xml"));

      // Output to console for testing
      // StreamResult result = new StreamResult(System.out);

      transformer.transform(source, result);

      System.out.println("File saved!");

    } catch (ParserConfigurationException pce) {
      pce.printStackTrace();
    } catch (TransformerException tfe) {
      tfe.printStackTrace();
    }
    //		sc.readData(customerNumbers);
  }