> Yes, it is possible to add an attribute to a common registry. > > On the other hand it is possible to realign what entries go in which > registry according to: > > - "reservations" to be in the "main" registry, using a working > definition of a "reservation" as something that all implementations > of the protocol have to honour. > > - all other IANA special purpose address assignments to be placed in > this special purpose registry (including, for example RFC1918 space, > 6to4 relays, etc), and the RFC to document the process of special > purpose assignment. an N-ary attribute or N lists, semantically about the same, syntax seems a matter of taste. i agree with the distinction, and am happy with either syntax. randy