1994 The content of the response objects is defined by the voucher
1995 [RFC8366] and the certificate [RFC5280].
I think this sentence is misleading here given how we know from prior text
in this document, that the format is much more specific, such as JWS+JSON
voucher and pkcs#7-mime certificate.
If this is meant as a more general excurse into how one could potentially
use all type of encodings in variations of a PRM which are not specified
in this document, then thats text for an appendix or something much further below,
but not here. Aka: delete sentence or make references specific to the actual
formats specified in this spec.
Comment from Toerless to section 6.3