// The following short XML file called "sites.xml" is parsed 
// in the code below. It must be in the project's "data" directory
// <?xml version="1.0"?>
// <websites>
//   <site id="0" url="processing.org">Processing</site>
//   <site id="1" url="mobile.processing.org">Processing Mobile</site>
// </websites>

XMLElement xml;

void setup() {
  size(200, 200);
  xml = new XMLElement(this, "sites.xml");
  int numSites = xml.getChildCount();
  println(numSites); // Prints "2"
}