title: How can I update an xml file periodically?
body: <p>Hy,
  I have to make a query on a Facebook table witch will return xml information about number of likes and so on.I have to keep those info in database or in a xml file on the disc and every day at a certain hour i have to update those dates.
  How can i make those updates at a certain time?
  If the information is very large and i can't store in database,can i store it in a xml file?</p>