>In the third paragraph the first sentence (still) says:
>
> > When a conforming CA issues a delta CRL, the CA MUST also issue a CRL
Originally, this sentence was placed in RFC 2459 to ensure that simple
clients are able to get the best possible revocation information. We did
not want to require CAs or clients to support delta-CRLs, but if a CA chose
to support delta-CRLs, we did not want to penalize clients.
I do not see that either of these desires has changed.