Key   string
		Value string
	}{
		Key:   k,
		Value: v,
	})
}

type xmlKeyEntry struct {
	XMLName xxml.Name
	Value   string `xml:",chardata"`
}

// MarshalXML - StringMap marshals into XML.
func (s *Metadata) MarshalXML(e *xxml.Encoder, start xxml.StartElement) error {
	if s == nil {
		return nil
	}

	if len(s.Items) == 0 {
		return nil
	}