question: @ SuppressWarnings ( "unused" ) public XmlWriter ( Writer w , Set < WriterFlags > f , String encoding ) throws IOException { this . writer = w ; this . flags = f != null ? f : EnumSet . noneOf ( WriterFlags . class ) ; this . encoding = encoding ; this . elementStack = new Stack < Element > ( ) ; Element rootElement = createElement ( null , null , null ) ; rootElement . openTagEnded = true ; elementStack . push ( rootElement ) ; }
target:  The default namespace that will take effect on the next element transition.