xml serialize io OutputStream io xhtmlserializer htmlserializer xhtmlserializer outputformat method.xhtml xhtmlserializer outputformat format format format outputformat method.xhtml xhtmlserializer writer outputformat format format format outputformat method.xhtml setoutputcharstream writer xhtmlserializer outputstream output outputformat format format format outputformat method.xhtml setoutputbytestream output setoutputformat outputformat format super.setoutputformat format format outputformat method.xhtml