title: Best way to continuously get new new data from a URL?
body: <p>I'm writing an iPad app that pulls various coordinates from an XML file on a web server, parses the information, and renders them on the screen. </p>
  
  <p>I was wondering if any of you have tips/suggestions on how I could have it refresh the data continuously, say, every second (since a computer program updates the XML file on the server every few seconds). Thanks!</p>