According to what I understand, there have to be two certificates per entity:
one is the CA-bit enabled certificate, used to sign subsidiary certificates about resources being given to other people to use.
the other is a self-signed NON-CA certificate, used to sign route assertions you are attesting to yourself: you make this cert using the CA cert you get from your logical parent.
probably more. smb has convinced me that the (possibly ca[0]) cert i get from the rir, with which i do business with the rir (dns, ip requests, billing), should be different than that which i use for routing info. randy --- [0] - i'll want the business cert to have the ca bit if i am large enough to have internal authorization process, and thus want to create and manage different certs for dns, billing, ...