class ActiveModel::Serializers::Xml::Serializer

def serialize
  require 'builder' unless defined? ::Builder
  options[:indent]  ||= 2
  options[:builder] ||= ::Builder::XmlMarkup.new(:indent => options[:indent])
  @builder = options[:builder]
  @builder.instruct! unless options[:skip_instruct]
  root = (options[:root] || @serializable.class.model_name.element).to_s
  root = ActiveSupport::XmlMini.rename_key(root, options)
  args = [root]
  args << {:xmlns => options[:namespace]} if options[:namespace]
  args << {:type => options[:type]} if options[:type] && !options[:skip_types]
  @builder.tag!(*args) do
    add_attributes_and_methods
    add_extra_behavior
    add_procs
    yield @builder if block_given?
  end
end