XML Flash ActionScript

package{
  import flash.display.Sprite;
  
  public class Main extends Sprite{
    public function Main(){
        XML.ignoreComments = false;
        XML.ignoreProcessingInstructions = false;
        var example:XML = 
                                  
                                  
                                     Welcome!
                                     
                                                                                   // execute some php code
                                        ?>
                                     
                                  
                               ;
        trace(example.*.comments().length()); // Displays: 2
        trace(example.body.comments().toXMLString());
        trace(example.body.comments()[1].toXMLString());
        trace(example.*.processingInstructions().toXMLString());
    }
  }
}