1. Weiser, M.:
http://www.ubiq.com/hypertext/weiser/Ubi-Home.html
2. ISO/IEC JTC 1/SC 32, ISO/IEC 11179: Information Technology - Metadata Registries (MDR) - Part 1 Part 6 (2004)
3. Jeong, D., In, P., Jarnjak, F., Kim, Y., Baik, D.-K.: A Message Conversion System, XML-based Metadata Semantics Description Language, and Metadata Repository. Journal of Information Science (JIS) 31(5), 394–406 (2005)
4. Environmental Protection Agency (EPA): Environmental Data Registry (EDR) (2004),
http://www.epa.gov/edr/
5. Australian Institute of Health and Welfare: Australian National Health Information Knowledgebase (2004),
http://www.aihw.gov.au/