class Hpricot::XMLDecl

def output(out, opts = {})
  out <<
    if_output(opts) do
      "<?xml version=\"#{version}\"" +
        (encoding ? " encoding=\"#{encoding}\"" : "") +
        (standalone != nil ? " standalone=\"#{standalone ? 'yes' : 'no'}\"" : "") +
        "?>"
    end
end