module ietf-network {
    yang-version 1;
    namespace "urn:ietf:params:xml:ns:yang:ietf-network";
    prefix nd;
    revision 2017-03-01 {
        reference
        "draft-ietf-i2rs-yang-network-topo-12";
    }
    container networks {
        list network {
            key "network-id";
            leaf network-id {
                type string;
            }
        }
    }
}