Please adopt
http://www.ietf.org/internet-drafts/draft-groth-openpgp-attribute-extension-00.txt
as a working group document. This document is trying to describe how to
utilise ASN.1 attributes with OpenPGP keys, the focus is to further
promote the use of OpenPGP keys for server purposes, however some people
expressed interest in other extensions that are more appropriate for
individuals.
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Best regards,
Duane