title: How does Scala XML support work?
body: <p>I'm sure it should be obvious, but I could find any references on my question.
  What underlying technology does Scala XML uses? Is it something DOM-like or SAX-like or StAX like? What performance penalties should I be aware of when processing large documents? Is StAX still more efficient?</p>
  
  <p>Thanks in advance.</p>