module augment-abstract-topology {
    yang-version 1;
    namespace "urn:model:augment:abstract:topology";
    prefix "atp";

    import ietf-inet-types { 
        prefix "inet";
        revision-date 2010-09-24;
    }

    import ietf-interfaces {
        prefix "if";
        revision-date 2012-11-15;
    }

    import abstract-topology {
        prefix "at";
        revision-date 2013-02-08;
    }

    organization "OPEN DAYLIGHT";
    contact "http://www.opendaylight.org/";

    revision "2013-05-03" {
        reference "http://www.opendaylight.org/";
    }

    augment "at:topology" {
        container interfaces {
            list interface {
                key "interface-id";

                leaf interface-id {
                    type leafref {
                        path "/if:interfaces/if:interface/if:name";
                    }
                }

                leaf-list higher-layer-if {
                    type leafref {
                        path "/if:interfaces/if:interface/if:higher-layer-if";
                    }
                }
            }
        }
    }

    augment "at:topology/at:network-links/at:network-link" {
        container tunnels {
            list tunnel {
                key "tunnel-id";

                leaf tunnel-id {
                    type leafref {
                        path "../../../link-id";
                    }
                }
            }
        }
    }

    augment "at:topology/at:network-links/at:network-link" {
        leaf interface {
            type leafref {
                path "../atp:interfaces/atp:interface/atp:interface-id";
            }
        }
    }
}