Extra metadata maintained internally in `xl.meta` for a transitioned object

                    return "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" + "<metadata>\n" + "  <versioning>\n" + "    <versions>\n"
                            + "      <version>1.0.0</version>\n" + "      <version>2.0.0</version>\n" + "    </versions>\n"
                            + "  </versioning>\n" + "</metadata>";
                }

			// we let the caller retry this disk again for the
			// buckets that failed healing.
			retErr = err
			healingLogIf(ctx, err)
			continue
		}

		var (
			vc   *versioning.Versioning
			lc   *lifecycle.Lifecycle
			lr   objectlock.Retention
			rcfg *replication.Config
		)

		if !isMinioMetaBucketName(bucket) {
			vc, err = globalBucketVersioningSys.Get(bucket)
			if err != nil {

	// If source has versioning enabled, target must have versioning enabled
	if minioType && ((info.Versioning && !vcfg.Enabled() && !isRemoteToLocal) || (!info.Versioning && vcfg.Enabled() && isRemoteToLocal)) {
		return batchReplicationJobError{
			Code: "InvalidBucketState",
			Description: fmt.Sprintf("The source '%s' has versioning enabled, target '%s' must have versioning enabled",
				r.Source.Bucket, r.Target.Bucket),

		Code:           "RemoteTargetNotVersionedError",
		Description:    "The remote target does not have versioning enabled",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrReplicationSourceNotVersionedError: {
		Code:           "ReplicationSourceNotVersionedError",
		Description:    "The replication source does not have versioning enabled",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrReplicationNeedsVersioningError: {

			Queries("replication", "")
		// GetBucketVersioning
		router.Methods(http.MethodGet).
			HandlerFunc(s3APIMiddleware(api.GetBucketVersioningHandler)).
			Queries("versioning", "")
		// GetBucketNotification
		router.Methods(http.MethodGet).
			HandlerFunc(s3APIMiddleware(api.GetBucketNotificationHandler)).
			Queries("notification", "")
		// ListenNotification

	},
		replicateBucketMetadata,
	)
	return errors.Unwrap(cerr)
}

// PeerBucketVersioningHandler - updates versioning config to local cluster.
func (c *SiteReplicationSys) PeerBucketVersioningHandler(ctx context.Context, bucket string, versioning *string, updatedAt time.Time) error {
	if versioning != nil {
		// skip overwrite if local update is newer than peer update.
		if !updatedAt.IsZero() {

	"response-content-language",
	"response-content-type",
	"response-expires",
	"retention",
	"select",
	"select-type",
	"tagging",
	"torrent",
	"uploadId",
	"uploads",
	"versionId",
	"versioning",
	"versions",
	"website",
}

// Signature and API related constants.
const (
	signV2Algorithm = "AWS"
)

// AWS S3 Signature V2 calculation rule is give here:

	}

	return nil
}

// Expire expires object versions which have already matched supplied filter conditions
func (r *BatchJobExpire) Expire(ctx context.Context, api ObjectLayer, vc *versioning.Versioning, objsToDel []ObjectToDelete) []error {
	opts := ObjectOptions{
		PrefixEnabledFn:  vc.PrefixEnabled,
		VersionSuspended: vc.Suspended(),
	}

	allErrs := make([]error, 0, len(objsToDel))

	for {

	PrefixEnabledFn func(prefix string) bool // function which returns true if versioning is enabled on prefix

	// IndexCB will return any index created but the compression.
	// Object must have been read at this point.
	IndexCB func() []byte

	// InclFreeVersions indicates that free versions need to be included
	// when looking up a version by fi.VersionID
	InclFreeVersions bool