Sector-based communities may hold information of interest to communities in other sectors, so communities of communities can be formed around a shared interest, for example the kind of information involved; this is inter-sector communication. It is greatly facilitated where each community has a supporting entity, because the supporting entities can then agree the exchange arrangements and controls among themselves instead of every member of every community doing so, and where an inter-sector community needs the identity of sending or receiving organizations hidden, the supporting entities can do that too.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.