IETF-55

Todo

Message header registry

Work through last call comments

Revise I-D/RFC format

Prepare initial registrations modelled on MIME media type

Add note to section 3.3 of registry doc:  IESG designated moderator will notify IANA when the registration can be completed.  (Consider the "drop dead" case: process must be clear from document.)  Treat this as last-call comment from IANA.