1. IEEE LTSC | WG12 | Final LOM Draft Standard,
http://ltsc.ieee.org/wg12/20020612-Final-LOM-Draft.html
2. Metadata Encoding & Transmission Standard,
http://www.loc.gov/standards/mets/
3. Open Archives Initiative Protocol for Metadata Harvesting,
http://www.openarchives.org/pmh/
4. SCORM,
http://www.adlnet.gov/capabilities/scorm
5. Bainbridge, D., Ke, K.Y.J., Witten, I.H.: Document level interoperability for collection creators. In: ACM/IEEE-CS Joint Conference on Digital Libraries - JCDL 2006, p. 105. ACM Press, New York (2006)