}
	case sizeGtPred:
		if f.ObjectSizeGreaterThan < 0 {
			err = errXMLNotWellFormed
		}
	}
	return err
}

// TestTags tests if the object tags satisfy the Filter tags requirement,
// it returns true if there is no tags in the underlying Filter.
func (f Filter) TestTags(userTags string) bool {
	if f.cachedTags == nil {
		cache := make(map[string]string)
		for _, t := range append(f.And.Tags, f.Tag) {