1. Open Pluggable Edge Services, http://www.ietf-opes.org.
2. Document Object Model (DOM) Level 1 Specification, W3C recommendation 1, October 1998, http://www.w3.org/TR/REC-DOM-Level-1/.
3. Open Pluggable Services Working Group Charter, October 2003, http://www.ietf.org/html.charters/opes-charter.html.
4. Grub—‘help crawl it all’, LookSmart, 2004, http://www.grub.org/.
5. R. Aiken, M. Carey, B. Carpenter, I. Foster, C. Lynch, J. Mambreti, R. Moore, J. Strasnner, B. Teitelbaum, Network Policy and Services: A Report of a Workshop on Middleware, RFC 2768, IETF, 2000, http://www.ietf.org/rfc/rfc2768.txt.