return err
	}
	if len(ssc.ReplicaModifications.Status) == 0 {
		ssc.ReplicaModifications.Status = Enabled
	}
	*s = SourceSelectionCriteria(ssc)
	return nil
}

// MarshalXML - encodes to XML data.
func (s SourceSelectionCriteria) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
	if err := e.EncodeToken(start); err != nil {
		return err
	}
	if s.IsValid() {

	case string(AES256):
		*alg = AES256
	case string(AWSKms):
		*alg = AWSKms
	default:
		return errors.New("Unknown SSE algorithm")
	}

	return nil
}

// MarshalXML - Marshals given SSE algorithm to valid XML
func (alg *Algorithm) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
	return e.EncodeElement(string(*alg), start)
}

// EncryptionAction - for ApplyServerSideEncryptionByDefault XML tag

	And    And
	andSet bool

	Tag    Tag
	tagSet bool

	// Caching tags, only once
	cachedTags map[string]string
}

// MarshalXML - produces the xml representation of the Filter struct
// only one of Prefix, And and Tag should be present in the output.
func (f Filter) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
	if !f.set {
		return nil
	}

	if err := e.EncodeToken(start); err != nil {
		return err

	case ObjectLargeVersions:
		return "s3:Scanner:LargeVersions"

	case PrefixManyFolders:
		return "s3:Scanner:BigPrefix"
	}

	return ""
}

// MarshalXML - encodes to XML data.
func (name Name) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
	return e.EncodeElement(name.String(), start)
}

// UnmarshalXML - decodes XML data.

type ObjectVersion struct {
	Object
	IsLatest  bool
	VersionID string `xml:"VersionId"`

	isDeleteMarker bool
}

// MarshalXML - marshal ObjectVersion
func (o ObjectVersion) MarshalXML(e *xxml.Encoder, start xxml.StartElement) error {
	if o.isDeleteMarker {
		start.Name.Local = "DeleteMarker"
	} else {
		start.Name.Local = "Version"
	}

	if err != nil {
		return ErrInvalidRetentionDate
	}

	*rDate = RetentionDate{retDate}
	return nil
}

// MarshalXML encodes expiration date if it is non-zero and encodes
// empty string otherwise
func (rDate RetentionDate) MarshalXML(e *xml.Encoder, startElement xml.StartElement) error {
	if rDate.IsZero() {
		return nil
	}

pkg encoding/xml, method (*Encoder) Flush() error
pkg encoding/xml, method (StartElement) End() EndElement
pkg encoding/xml, type Marshaler interface { MarshalXML }
pkg encoding/xml, type Marshaler interface, MarshalXML(*Encoder, StartElement) error
pkg encoding/xml, type MarshalerAttr interface { MarshalXMLAttr }
pkg encoding/xml, type MarshalerAttr interface, MarshalXMLAttr(Name) (Attr, error)