l parser allows the
 application to drive the parser instead of having document
 information events "pushed" to the registered handlers.
 <p>
 A pull parser using this type of configuration first calls
 the <code>setInputSource</code> method. After the input
 source is set, the pull parser repeatedly calls the
 <code>parse(boolean):boolean</code> method. This method 
 returns a value of true if there is more to parse in the
 document.
 <p>
 Calling the <code>parse(XMLInputSource)</code> is equivalent
 to se