🚀 go-pugleaf

The reason for my question is that in group communication,
we would like to have a format which is as closely aligned
to the X.400 IPM format as possible. But we still need
a way of referring to the individual links defined in
the heading. By link I mean such attributes in the heading
which refer to other objects, like primary-recipients and
replied-to-IPM.

After your advice, I will now propose the following construct.
Whether that construct will be liked by the other people
in the standards group is something we will see at our next
meeting, in Tokyo in the beginning of February.

LinkName ::= SEQUENCE { 
        ipmid-part      IPMIdentifier, - - - as defined in X.420
        link-type       INTEGER (authorizing-users(1), primary-recipients(2),
                        copy-recipients(3), blind-copy-recipients(4), 
                        replied-to-IPMs(5), obsoleted-IPMs(6),
                        related-IPMs(7), reply-recipients(11)),
        link-position   INTEGER (0<..MAX) DEFAULT 1 - -  position of link in
                        - - sequences of more than one of the same type
   }