   module check {
     yang-version 1;
     namespace "urn:ietf:params:xml:ns:yang:ietf-network4:check:namespace";
     prefix nd;

     organization
       "IETF I2RS (Interface to the Routing System) Working Group";

     contact
       "WG Web:    <http://tools.ietf.org/wg/i2rs/>
        WG List:   <mailto:i2rs@ietf.org>

        WG Chair:  Susan Hares
                   <mailto:shares@ndzh.com>

        WG Chair:  Jeffrey Haas
                   <mailto:jhaas@pfrc.org>

        Editor:    Alexander Clemm
                   <mailto:alex@cisco.com>

        Editor:    Jan Medved
                   <mailto:jmedved@cisco.com>

        Editor:    Robert Varga
                   <mailto:rovarga@cisco.com>

        Editor:    Tony Tkacik
                   <mailto:ttkacik@cisco.com>

        Editor:    Nitin Bahadur
                   <mailto:nitin_bahadur@yahoo.com>

        Editor:    Hariharan Ananthakrishnan
                   <mailto:hari@packetdesign.com>";

     description
       "This module defines a common base model for a collection
        of nodes in a network. Node definitions are further used
        in network topologies and inventories.

        Copyright (c) 2015 IETF Trust and the persons identified as
        authors of the code.  All rights reserved.

        Redistribution and use in source and binary forms, with or
        without modification, is permitted pursuant to, and subject
        to the license terms contained in, the Simplified BSD License
        set forth in Section 4.c of the IETF Trust's Legal Provisions
        Relating to IETF Documents
        (http://trustee.ietf.org/license-info).

        This version of this YANG module is part of
        draft-ietf-i2rs-yang-network-topo-02;
        see the RFC itself for full legal notices.

        NOTE TO RFC EDITOR: Please replace above reference to
        draft-ietf-i2rs-yang-network-topo-02 with RFC
        number when published (i.e. RFC xxxx).";

     revision 2015-12-08 {
       description
         "Initial revision.
          NOTE TO RFC EDITOR: Please replace the following reference
          to draft-ietf-i2rs-yang-network-topo-02 with
          RFC number when published (i.e. RFC xxxx).";
       reference
         "draft-ietf-i2rs-yang-network-topo-02";
     }

         container networks {
             leaf id {
                 type int32;
             }
             container network {
                  leaf ip-address {
                      type int32;
                  }
             }
         }
}