I'd like to see the concept of an RFC "updating" another RFC clarified. Currently the draft says:
Updates
Specifies an earlier document whose contents are modified or augmented by the new document. The new document cannot be used alone, it can only be used in conjunction with the earlier document.
The second statement seems to be misleading. For instance, RFC2396 (URI syntax) updates previous RFCs that also contained specific URI scheme descriptions (such as "ftp"). Thus, it doesn't obsolete them. However, RFC2396 clearly can be used without the documents it's updating.
Regards, Julian