title: Where are the differences using XML and MySQL database? Which should I use?
body: <p>Well, I know its a bit stupid. If I want to store a large amount of data. Should I use xml or database(mysql)?</p>
  
  <p>Why do you choose (that) one?</p>
  
  <p>What are the pros and cons using xml?</p>
  
  <p>What are the pros and cons using mysql?</p>
  
  <p>Clubpenguin, habbo hotel, those virtual worlds are using xml or mysql??</p>