I like the idea of a notary signature that only signs a signature packet.
This would mean your signer doesn't even need to see the document that's
being notarized, which has a certain panache to it.
How about if I do this:
* Write up a description of a notary signature.
* Change the "revocation target" subpacket to be a "signature target"
subpacket so it can work double duty
How's that sound?
Jon