dom io OutputStream io w3c dom ls LSOutput domoutputimpl lsoutput fcharstream outputstream fbytestream fsystemid fencoding domoutputimpl getcharacterstream fcharstream setcharacterstream characterstream fcharstream characterstream outputstream getbytestream fbytestream setbytestream outputstream bytestream fbytestream bytestream getsystemid fsystemid setsystemid systemid fsystemid systemid getencoding fencoding setencoding encoding fencoding encoding