module ietf-network {
    yang-version 1;
    namespace "urn:ietf:params:xml:ns:yang:ietf-network";
    prefix nd;
    grouping networks {
        leaf network-id {
            type uint8;
            description
            "Identifies a network.";
        }
    }
    container current {
        leaf network-ref {
            type leafref {
            path "/networks/network-id";
            }
        }
    }
}