Access experimental subpackets of 'User Attribute Packet'

[Joe Smith]

Be careful with this. First of all both the second and third packet can be 
implemented as the first packet type. Second encouraging users to place 
extra data into theie keys is just asking for problem. Imaginge when 
somebody decides to attaches a 50 MiB mpeg to their key, and uploads it to 
the keyservers.

Third and most importantly, Anything for specifying pgpmime vs inline mime 
should be avoided. Let the experts (The openpgp working group) hash these 
things out.

For example there is the pgp corp implementation: 
http://www.imc.org/ietf-openpgp/mail-archive/msg08704.html

In fact just let all of this sort of ting be handled by the openpgp working 
group. They are the experts. (To the extent that they are.)