s-o-1036 June 1994

6.14. Supersedes

The  Supersedes header content specifies articles to be can-
celled on arrival of this one:

     Supersedes-content = message-id *( space message-id )

Supersedes is equivalent to Also-Control (section 6.15) with
an implicit verb of "cancel" (section 7.1).

     NOTE:  Supersedes is normally used where the arti-
     cle is an updated version of the one(s) being can-
     celled.

     NOTE: Although the ability to use multiple message
     IDs in Supersedes is highly desirable (see section
     7.1), posters are warned that existing implementa-
     tions often do not correctly handle more than one.

     NOTE: There is no "c" in "Supersedes".

An  article  with a Supersedes header MUST not have an Also-
Control or Control header.