[Cbor] Fwd: New version of MIMI content with CBOR

Rohan Mahy <rohan.ietf@gmail.com> Tue, 11 June 2024 01:43 UTC

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From: Rohan Mahy <rohan.ietf@gmail.com>
Date: Mon, 10 Jun 2024 21:43:03 -0400
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Subject: [Cbor] Fwd: New version of MIMI content with CBOR
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Reposting to CBOR mailing list as well.
Thanks,
-rohan

---------- Forwarded message ---------
From: Rohan Mahy <rohan.ietf@gmail.com>
Date: Mon, Jun 10, 2024 at 10:59 AM
Subject: New version of MIMI content with CBOR
To: <mimi@ietf.org>

I just submitted an -04 of mimi-content. This now has all the validated
CBOR examples and has concrete multipart examples in an Appendix.
https://www.ietf.org/archive/id/draft-ietf-mimi-content-04.html

Please have a look. I think we have a format which does what we need.

There are three CBOR-related issues, with my thoughts about them.

1) tagging URIs. We could leave URIs untagged, or we could add the
one-octet tag which would make them easy to recognize by generic CBOR
libraries. I am a proponent of tagging in this case.

2) time format. We could use a fixed number of milliseconds for the
timestamp, or we could use the CBOR extended time format
(draft-ietf-cbor-time-tag currently in AUTH48) which would allow timestamps
to vary the precision to microseconds or nanoseconds. This issue will
probably move to mimi-protocol as this is a value conveyed outside
mimi-content.
https://www.ietf.org/archive/id/draft-ietf-cbor-time-tag-12.html

3) Right now the "bodies" (NestedPart) have their own array, which results
in pretty heavy nesting. We could replace this with a CBOR sequence or
embedded CBOR.

Thanks,
-rohan

[Cbor] Fwd: New version of MIMI content with CBOR Rohan Mahy