A community needs a common interest or other relationship that defines the scope of the sensitive information shared, such as one market sector with membership limited to that sector, a geographical location or common ownership, and it needs trust between members, in particular that every member will follow the information sharing agreement. The community's scope statement and its agreement are the two artefacts everything else rests on.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.