question: private static HelpNode fromXml ( InputSource source ) throws ParserConfigurationException , SAXException , IOException { SAXParserFactory factory = SAXParserFactory . newInstance ( ) ; SAXParser parser = factory . newSAXParser ( ) ; HelpReader reader = new HelpReader ( ) ; parser . parse ( source , reader ) ; return reader . root ; }
target:  Returns a new simulation object from the given input source.