We don't have a PEM-MIME profile yet. An I-D was prepared
just before the last IETF meeting, but discussion of it in the PEM WG
uncovered some problems that have to be resolved. I have not seen a
revision of the I-D yet. I think that explains, at least in part,
why you dont' yet see mapping in question.
Status report: I'm currently the editor/document holder, and I completed making
the requested changes some time ago. However, the document is still undergoing
coauthor/editor review, and I am reluctant to release a new draft until this
task is completed. If there's an urgent need to get the new draft out please
let me know and I will do what I can to expedite matters.
Please note that this document is only concerned with MIME-PEM issues, and does
not address X.400 directly in any way. I'll have more to say about X.400
integration as a separate matter; I don't think this needs to be addressed
directly in the MIME-PEM document.
Ned