return nil
	}
	type s3KeyWrapper S3Key
	return e.EncodeElement(s3KeyWrapper(s3Key), start)
}

// common - represents common elements inside <QueueConfiguration>, <CloudFunctionConfiguration>
// and <TopicConfiguration>
type common struct {
	ID     string `xml:"Id" json:"Id"`
	Filter S3Key  `xml:"Filter" json:"Filter"`
	Events []Name `xml:"Event" json:"Event"`
}

	      <Event>s3:ObjectCreated:Put</Event>
	   </CloudFunctionConfiguration>
	   <TopicConfiguration>
	      <Topic>arn:aws:sns:us-west-2:444455556666:sns-notification-one</Topic>
	      <Event>s3:ObjectCreated:*</Event>
	  </TopicConfiguration>
	</NotificationConfiguration>
	`)