insertion in to xml

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XML

I have a xml file in the below format. The problem is that how can I insert multiple values to this file from the UI page/form? I have View page which contains textbox for application,module,table,colums,database etc)with one insert button on click it should insert in to this file. So, please tell me how to do that one

<applications>
  <application id="1" name="XYZ">
    <module id="101" name="XYZ">
      <tablename id="1011" name="XYZ">
        <columnname id="10111">XYZ</columnname>
        <columnname id="10112">XYZ</columnname>
      </tablename>
    </module>
    <module id="201" name="XYZ">
      <tablename id="2011" name="XYZ">
        <columnname id="10111">XYZ</columnname>
      </tablename>
      <tablename id="2012" name="XYZ">
        <columnname id="20121">XYZ</columnname>
        <columnname id="20122">XYZ</columnname>
      </tablename>
      <tablename id="2013" name="XYZ">
        <columnname id="10111">XYZ</columnname>
      </tablename>
    </module>
  </application>
  <databases>
    <database>XYZ</database>
    <database>XYZ</database>
  </databases>
  <connections>
    <connection>XYZ</connection>
    <connection>sdfasdfasd</connection>
  </connections>
</applications>