contract PermissionedNetworks {
        //Track nodes and their particular network state (their network permission).
        mapping(uint8 => mapping(bytes32 => bool)) public networkNodes;

        //Add a node to a particular network partition/zone.
        function addNodeToPermissionedNetwork(bytes32 _nodeID, uint8 _networkID, bool _nodeState) public {
            networkNodes[_networkID][_nodeID] = networkNodes[_networkID][_nodeID] = _nodeState;
        }
    }