XML : Java (add data to a xml file without overwrite)

I am practicing with Java Swing and I am doing a menu item that saves the data on a xml, adding the content without overwriting... the matter is that it seems that for any mistake it always delete all the xml except the first child of root, and then appends the data correctly...

Here is the xml (with test data)

  <?xml version="1.0" encoding="UTF-8" standalone="no"?>      <Settings>        <Setting>           <Name>r</Name>           <Channel>r</Channel>           <Amp>r</Amp>           <Effects>r</Effects>           <Pregain>r</Pregain>           <Low>r</Low>           <Mid>r</Mid>           <High>r</High>           <Postgain>r</Postgain>           <Param1>r</Param1>           <Param2>r</Param2>           <Feedback>r</Feedback>           <Level>r</Level>           <Reverb>r</Reverb>        </Setting>        <Setting>           <Name>d</Name>           <Channel>d</Channel>           <Amp>d</Amp>           <Effects>d</Effects>           <Pregain>d</Pregain>           <Low>d</Low>           <Mid>d</Mid>           <High>d</High>           <Postgain>d</Postgain>           <Param1>d</Param1>           <Param2>d</Param2>           <Feedback>d</Feedback>           <Level>d</Level>           <Reverb>d</Reverb>        </Setting>      </Settings>     

And here is the java code

  menuitemsave = new JMenuItem("Save");      menuitemsave.addMouseListener(new MouseAdapter() {          @Override          public void mouseReleased(MouseEvent e) {                  try {                    DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();                  DocumentBuilder docBuilder = docFactory.newDocumentBuilder();                       // Read XML                  Document document = docBuilder.parse("Settings.xml");                    // Root - Settings                  Element root = document.getDocumentElement();                    // Element - Setting                  Element Setting = document.createElement("Setting");                  root.appendChild(Setting);                    // Attribute - Name                  Element Name = document.createElement("Name");                  Name.appendChild(document.createTextNode(txtname.getText()));                  Setting.appendChild(Name);                    // Attribute - Channel                  Element Channel = document.createElement("Channel");                  Channel.appendChild(document.createTextNode(txtchannel.getText()));                  Setting.appendChild(Channel);                    // Attribute - Amp                  Element Amp = document.createElement("Amp");                  Amp.appendChild(document.createTextNode(txtamp.getText()));                  Setting.appendChild(Amp);                    // Attribute - Effects                  Element Effects = document.createElement("Effects");                  Effects.appendChild(document.createTextNode(txteffects.getText()));                  Setting.appendChild(Effects);                    // Attribute - Pre Gain                  Element Pregain = document.createElement("Pregain");                  Pregain.appendChild(document.createTextNode(txtpregain.getText()));                  Setting.appendChild(Pregain);                    // Attribute - Low                  Element Low = document.createElement("Low");                  Low.appendChild(document.createTextNode(txtlow.getText()));                  Setting.appendChild(Low);                    // Attribute -Mid                  Element Mid = document.createElement("Mid");                  Mid.appendChild(document.createTextNode(txtmid.getText()));                  Setting.appendChild(Mid);                    // Attribute -High                  Element High = document.createElement("High");                  High.appendChild(document.createTextNode(txthigh.getText()));                  Setting.appendChild(High);                    // Attribute -Post Gain                  Element Postgain = document.createElement("Postgain");                  Postgain.appendChild(document.createTextNode(txtpostgain.getText()));                  Setting.appendChild(Postgain);                    // Attribute -Parameter 1                  Element Param1 = document.createElement("Param1");                  Param1.appendChild(document.createTextNode(txtparam1.getText()));                  Setting.appendChild(Param1);                    // Attribute -Parameter 2                  Element Param2 = document.createElement("Param2");                  Param2.appendChild(document.createTextNode(txtparam2.getText()));                  Setting.appendChild(Param2);                    // Attribute -Feedback                  Element Feedback = document.createElement("Feedback");                  Feedback.appendChild(document.createTextNode(txtfeedback.getText()));                  Setting.appendChild(Feedback);                    // Attribute -Level                  Element Level = document.createElement("Level");                  Level.appendChild(document.createTextNode(txtlevel.getText()));                  Setting.appendChild(Level);                    // Attribute -Reverb                  Element Reverb = document.createElement("Reverb");                  Reverb.appendChild(document.createTextNode(txtreverb.getText()));                  Setting.appendChild(Reverb);                    // Write the content into XML file                  TransformerFactory transformerFactory = TransformerFactory.newInstance();                  Transformer transformer = transformerFactory.newTransformer();                  DOMSource source = new DOMSource(document);                  StreamResult result = new StreamResult(new File("Settings.xml"));                    transformer.transform(source, result);                    JOptionPane.showMessageDialog(null, "Saved");                  } catch (ParserConfigurationException pce) {                  pce.printStackTrace();                } catch (TransformerException tfe) {                  tfe.printStackTrace();                } catch (SAXException e1) {                  // TODO Auto-generated catch block                  e1.printStackTrace();              } catch (IOException e1) {                  // TODO Auto-generated catch block                  e1.printStackTrace();              }            }      });      mnMenu.add(menuitemsave);    

¿Any idea about why it seems to delete all the other childs except the first and then append?

Thanks