title: How to develop for iphone application about "retrieving database file on web"?
body: <p>I'm a newbie to iphone developer.</p>
  
  <p>Well, currently, I'm developing iphone for Location Based Service.</p>
  
  <p>That application need to have these functions.
  1. hierarchical tree-view on navigation bar.
  2. list up page
  3. detail page</p>
  
  <p>for example, </p>
  
  <p>Let's say. I have top category like "Restaurant, Hotel, Gift Shop"
  Second level "New York, LA, London,....."</p>
  
  <p>Third Level displays all Data with 1 photo.
  Fourth Level displays Detail of that "Restaurant or Hotel, Gift shop, ..."</p>
  
  <p>So, My Only Interest is "How to retrieve the data from remote database server. not using iphone local one."</p>
  
  <p>Because, that locations, and shops should be updated frequently, (you know some shops closed, new shops opens.)</p>
  
  <p>So, till now, I figured out that using XML to retrieve data.</p>
  
  <p>However, using XML is the most effective way to implement?</p>
  
  <p>Is there any other way to accomplish this work? </p>
  
  <p>You know, transferring XML data via 3G Network is really slow. 
  XML file have more bytes than plist file.</p>
  
  <p>I'm currently a beginner of iphone development.</p>
  
  <p>So, please help me find a right way!!</p>
  
  <p>And, one more question, if I use xml way. Is it possible to Paging? (First page 10 lists up, below that more button...)</p>
  
  <p>well, you might guess each category have hundreds of shops!!</p>