Endpoint discovery

[acdha]

During the latest conference call, the question of endpoint discovery came up. We should consider exactly how people intend to use this protocol to determine whether we in fact do need a way to retrieve a list of endpoints and, if so, how that should work.

[edsu]

One nice thing about an update mechanism to let an endpoint know you have fetched a bag, and where it is, is that you are basically announcing yourself as an endpoint.