# File lib/aws/s3/bucket_lifecycle_configuration.rb, line 259
      def to_xml
        xml = Builder::XmlMarkup.new(:indent => 2)
        xml.LifecycleConfiguration do
          rules.each do |rule|
            xml.Rule do
              xml.ID rule.id
              xml.Prefix rule.prefix
              xml.Status rule.status
              xml.Expiration do
                xml.Days rule.expiration_days
              end
            end
          end
        end.strip
      end