@JuttaBuschbom I see the trunk of the tree as being a cloud more or less enveloping the ideas of the ‘DOI for a DS’ sketch I introduced earlier. Within that cloud, different subsystems can be implemented in a centralised or distributed manner, or a combination of the two. The important facts are that i) there are access points/entities at the edge for users, institutions, aggregators, etc. and ii) that topologies of implementation (central, distributed, federated, etc.) are separate from arrangements of governance (centralised, decentralised) (which usually drive decisions about the former).
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