module ietf-netconf-system-notifications {

    namespace
      "urn:ietf:params:xml:ns:yang:ietf-netconf-system-notifications";

    prefix ncsys;

    import ietf-inet-types { prefix inet; }
    import ietf-netconf { prefix nc; }

    organization
     "IETF NETCONF (Network Configuration Protocol) Working Group";

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

      WG Chair: Bert Wijnen
                <mailto:bertietf@bwijnen.net>

      WG Chair: Mehmet Ersue
                <mailto:mehmet.ersue@nsn.com>

      Editor: Andy Bierman
              <mailto:andy.bierman@brocade.com>";

    description
     "This module defines an YANG data model for use with the
      NETCONF protocol that allows the NETCONF client to
      receive common NETCONF system notification events.

      Copyright (c) 2011 IETF Trust and the persons identified as
      the document authors.  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 RFC XXXX; see
      the RFC itself for full legal notices.";
    // RFC Ed.: replace XXXX with actual RFC number and remove this note

    // RFC Ed.: remove this note
    // Note: extracted from
    // draft-ietf-netconf-system-notifications-03.txt

    revision 2011-03-08 {
      description
        "Initial version.";
      reference
       "RFC XXXX: NETCONF System Notifications";
    }
    // RFC Ed.: replace XXXX with actual
    // RFC number and remove this note


   grouping common-session-parms {
     leaf username {
       description
         "Name of the user for the session.";
       type string;
       mandatory true;
     }

     leaf session-id {
       description
         "Identifier of the session.
          A non-NETCONF session will be identified by the value zero.";
       type nc:session-id-or-zero-type;
       mandatory true;
     }

     leaf source-host {
       description
         "Address of the remote host for the session.";
       type inet:ip-address;
     }
   }


   grouping changed-by-parms {
     container changed-by {
       description
         "Indicates who caused this change.
         If caused by internal action, then the
         empty leaf 'server' will be present.
         If caused by a management session, then
         the name, remote host address, and session ID
         of the session that made the change will be reported.";
       choice server-or-user {
         mandatory true;
         leaf server {
           type empty;
           description
             "If present, the change was caused
              by the server.";
         }

         case by-user {
           uses common-session-parms;
         }
       } // choice server-or-user
     } // container changed-by-parms;
   }


   notification netconf-config-change {
     description
       "Generated when the NETCONF server detects that the
        <running> or <startup> configuration datastore has changed.";

     uses changed-by-parms;

     leaf target-datastore {
       type enumeration {
         enum running {
           description "The running datastore has changed.";
         }
         enum startup {
           description "The startup datastore has changed";
         }
       }
       description
         "Indicates which configuration datastore has changed.";
       default "running";
     }

     list edit {
       description
         "An edit record will be present for each distinct
         edit operation on the target datastore.";

       leaf target {
         type instance-identifier;
         description
           "Topmost node associated with the configuration change.
            A server SHOULD set this object to the node within
            the datastore which is being altered.  A server MAY
            set this object to one of the ancestors of the actual
            node that was changed, or omit this object, if the
            exact node is not known.";
       }

       leaf operation {
         type nc:edit-operation-type;
         description
            "Type of edit operation performed.
             A server MUST set this object to the NETCONF edit
             operation performed on the target datastore.";
       }
     } // list edit
   } // notification netconf-config-change


   notification netconf-capability-change {
     description
       "Generated when a <capability> is added, deleted,
        or modified.";

     uses changed-by-parms;

     leaf-list added-capability {
       type inet:uri;
       description
         "List of capabilities that have just been added.";
     }

     leaf-list deleted-capability {
       type inet:uri;
       description
         "List of capabilities that have just been deleted.";
     }

     leaf-list modified-capability {
       type inet:uri;
       description
         "List of capabilities that have just been modified.
          A capability is considered to be modified if the
          base URI for the capability has not changed, but
          one or more of the parameters encoded at the end of
          the capability URI has changed.
          The new modified value of the complete URI is returned.";
     }
   } // notification netconf-capability-change


   notification netconf-session-start {
     description
       "Generated when a new NETCONF session is started.";
     uses common-session-parms;
   } // notification netconf-session-start


   notification netconf-session-end {
     description
       "Generated when a NETCONF session is terminated.";

     uses common-session-parms;

     leaf killed-by {
       when "../termination-reason = 'killed'";
       type nc:session-id-type;
       description
         "Session ID that issued the <kill-session>
         if the session was terminated by this operation.";
     }

     leaf termination-reason {
       type enumeration {
         enum "closed" {
           value 0;
           description
             "The session was terminated with
             the NETCONF <close-session> operation.";
         }
         enum "killed" {
           value 1;
           description
             "The session was terminated with
             the NETCONF <kill-session> operation.";
         }
         enum "dropped" {
           value 2;
           description
             "The session was terminated because
             the transport layer connection was
             unexpectedly closed.";
         }
         enum "timeout" {
           value 3;
           description
             "The session was terminated because
             of inactivity, either waiting for
             the <hello> or <rpc> messages.";
         }
         enum "bad-hello" {
           value 4;
           description
             "The client's <hello> message was invalid.";
         }
         enum "other" {
           value 5;
           description
             "The session was terminated for
             some other reason.";
         }
       }
       mandatory "true";
       description "Reason the session was terminated.";
     }
   } // notification netconf-session-end


   notification netconf-confirmed-commit {
     description
       "Generated when a confirmed-commit event occurs.";
     reference
       "I-D draft-ietf-netconf-4741bis section 8.4";

     uses common-session-parms {
       when "../confirm-event != 'timeout'";
     }

     leaf confirm-event {
       description
         "Indicates the event that caused the notification.";
       type enumeration {
         enum "start" {
           value 0;
           description
             "The confirm-commit procedure has started.";
         }
         enum "cancel" {
           value 1;
           description
             "The confirm-commit procedure has been canceled,
             due to the session being terminated, or an
             explicit <cancel-commit> operation.";
         }
         enum "timeout" {
           value 2;
           description
             "The confirm-commit procedure has been canceled,
             due to the confirm-timeout interval expiring.
             The common session parameters will not be present
             in this sub-mode.";
         }
         enum "extend" {
           value 3;
           description
             "The confirm-commit timeout has been extended.";
         }
         enum "complete" {
           value 4;
           description
             "The confirm-commit procedure has been completed.";
         }
       }
       mandatory "true";
     }

     leaf timeout {
       when
        "../confirm-event = 'start' or ../confirm-event = 'extend'";
       description
        "The configured timeout value if the event type
         is 'start' or 'extend'.  This value represents the
         the approximate number of seconds from the event
         time when the 'timeout' event might occur.";
       units "seconds";
       type uint32;
     }
   } // notification netconf-confirmed-commit

 }