This is great. Regarding the tools used to do annotations, has any thought (possibly elsewhere) been given to (a) format(s) one can easily save, modify, share e

This is great. Regarding the tools used to do annotations, has any thought (possibly elsewhere) been given to (a) format(s) one can easily save, modify, share etc? I.e. doesn't require a (proprietary?) server, or even something that could be integrated with a federated wiki?