While I generally accept Bob's careful research, and while I think it is imperative that multiple IDs are allowed in principle, as to avoid monopolies, my feeling is: * The number of IDs should be minimized. * The http:-URI is defacto the most relevant ID in the semantic web. * Avoid multiple alternative ways of embedding a UUID-string in a resolvable URI. All forms have to be added as sameAs information. They become ballast for future generations. That is: take the http-ID serious as a resource requiring long-term management and persistence. Finally: Success is measured by the adoption by people not visiting tdwg meetings. This is a social issue. The last point is my main reservation about the TDWG Applicability Statement for GUID's. Gregor