Bridge -> Mirror [label="mirrors*"];
Bridge -> Port [label="ports*"];
Bridge -> Controller [label="controller*"];
+ Bridge -> Flow_Table [label="flow_tables value*"];
Bridge -> NetFlow [label="netflow?"];
QoS [style=bold];
QoS -> Queue [label="queues value*"];
Open_vSwitch -> SSL [label="ssl?"];
Open_vSwitch -> Manager [label="manager_options*"];
Controller [];
+ Flow_Table [];
Queue [style=bold];
SSL [];
Manager [];