class Nokogiri::XML::Node

def serialize(*args, &block)


end
config.format.as_xml
node.serialize(encoding: 'UTF-8') do |config|

or

node.serialize(encoding: 'UTF-8', save_with: FORMAT | AS_XML)

These two statements are equivalent:

See also Nokogiri::XML::Node::SaveOptions and Node@Serialization+and+Generating+Output.

Serialize Node using +options+. Save options can also be set using a block.
## 
def serialize(*args, &block)
  # TODO: deprecate non-hash options, see 46c68ed 2009-06-20 for context
  options = if args.first.is_a?(Hash)
    args.shift
  else
    {
      encoding: args[0],
      save_with: args[1],
    }
  end
  options[:encoding] ||= document.encoding
  encoding = Encoding.find(options[:encoding] || "UTF-8")
  io = StringIO.new(String.new(encoding: encoding))
  write_to(io, options, &block)
  io.string
end