title: convert &lt to < xml document
body: <p>I have read an XML file and converted into NSXMLDocument object. But, due to the presence of "&lt;" in the string content of a node, it has been converted into "&amp;lt". So, when i write it as xml document to a file, it has the character "&amp;lt" in it. </p>
  
  <p>How can i write to the file as ordinary XML file in which "&amp;lt" will be replaced by "&lt;".</p>
  
  <p>Thanks and Regards,
  Lenin  </p>