Correct, you are at the mercy that both Wikis are interoperable. But, each of the N actors can have its model and only agree on an abstraction, which the intero

Correct, you are at the mercy that both Wikis are interoperable. But, each of the N actors can have its model and only agree on an abstraction, which the interoperability is based on. Let's assume an application provides a new feature, which deviates from the abstraction model. As an example, that feature could be of a "like" counter. The counter would then only be visible in a subset of application. Since the underlying data structure is a graph, every application can attach arbitrary information to an node. But the application only retrieves the necessary bits. Furthermore, I think that apps must be able to handle missing bits to some extent. I hope this is not confusing. If it helps, one could think of Solid to be the GraphQL endpoint, where the clients send queries expressed as SPARQL and only get back the requested bits of information.