rails/activeresource/lib/active_resource/formats/xml_format.rb

require 'active_support/core_ext/hash/conversions'

module ActiveResource
  module Formats
    module XmlFormat
      extend self

      def extension
        "xml"
      end

      def mime_type
        "application/xml"
      end

      def encode(hash, options={})
        hash.to_xml(options)
      end

      def decode(xml)
        Formats.remove_root(Hash.from_xml(xml))
      end
    end
  end
end