Before revision: If no identifier exists yet for the endpoint, the client software will either prompt the user to determine if the client should trust the identifier or it will simply trust the identifier which was given and record the trust relationship into its trust database.
After revision: If no identifier exists yet for the endpoint, the client software will either prompt the user to confirm they have verified the purported identifier is authentic, or if manual verification is not assumed to be possible in the protocol, the client will simply trust the identifier which was given and record the trust relationship into its trust database.