What is a community root cross-reference?
A community root cross-reference is a community root authority expressed with a cross-reference. This enables peer-to-peer identifier communities to form and evolve without registration. Using a globally unique identifier as the community root cross-reference helps ensure against name collisions (however there is no ironclad guarantee that two or more communities will not choose the same cross-reference for their root.) Typically a community root cross-reference is identified by a URI.
