class AWS::S3::BucketLifecycleConfiguration

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