module ietf-5277-netconf {

    yang-version 1;

    namespace
      "urn:ietf:params:xml:ns:yang:ietf-5277-netconf";

    prefix notif;

    import ietf-yang-types {
      prefix yang;
    }

    organization "IETF";

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

     WG Chair: Mahesh Jethanandani
               <mailto:mjethanandani@gmail.com>

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

     Editor:   Alberto Gonzalez Prieto
               <mailto:albertgo@cisco.com>

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

     Editor:   Eric Voit
               <mailto:evoit@cisco.com>

     Editor:   Einar Nilsen-Nygaard
               <mailto:einarnn@cisco.com>

     Editor:   Ambika Prasad Tripathy
               <mailto:ambtripa@cisco.com>";

    description
      "Model for RPCs and Notifications in RFC 5277: NETCONF Event
     Notifications";

    revision "2016-06-15" {
      description
        "Model for RPC in RFC 5277: NETCONF Event Notifications";
      reference
        "RFC 5277: NETCONF Event Notifications";

    }


    identity stream {
      description
        "Base identity to represent a generic stream of event
       notifications.";
    }

    identity NETCONF {
      base stream;
      description
        "Default NETCONF event stream, containing events based on
       notifications defined as YANG modules that are supported
       by the system.";
    }

    typedef stream {
      type identityref {
        base stream;
      }
      description
        "Specifies a system-provided datastream.";
    }

    grouping base-filter {
      description
        "This grouping defines the base for filters for
       notification events.
       It includes the filter defined in 5277 and
       it enables extending filtering to other
       types of filters";
      choice filter-type {
        description
          "A filter needs to be a single filter of a given type.
         Mixing and matching of multiple filters does not occur
         at the level of this grouping.";
        anyxml filter {
          description
            "Filter per RFC 5277. Notification filter.
            If a filter element is specified to look for data of a
            particular value, and the data item is not present
            within a particular event notification for its value to
            be checked against, the notification will be filtered
            out. For example, if one were to check for
            'severity=critical' in a configuration event
            notification where this field was not supported, then
            the notification would be filtered out. For subtree
            filtering, a non-empty node set means that the filter
            matches.  For XPath filtering, the mechanisms defined
            in [XPATH] should be used to convert the returned
            value to boolean.";
        }
      }  // choice filter-type
    }  // grouping base-filter

    grouping subscription-info-5277 {
      description
        "This grouping describes the information in a 5277
       subscription.";
      leaf stream {
        type stream;
        default "NETCONF";
        description
          "Indicates which stream of events is of interest.
         If not present, events in the default NETCONF stream
         will be sent.";
      }

      uses base-filter;

      leaf startTime {
        type yang:date-and-time;
        description
          "Used to trigger the replay feature
         and indicate that the replay should start at the time
         specified.  If <startTime> is not present, this is not a
         replay subscription.  It is not valid to specify start
         times that are later than the current time.  If the
         <startTime> specified is earlier than the log can support,
         the replay will begin with the earliest available
         notification.  This parameter is of type dateTime and
         compliant to [RFC3339].  Implementations must
         support time zones.";
      }

      leaf stopTime {
        type yang:date-and-time;
        must "current()  > ../startTime" {
          description
            "stopTime must be used with and be later than <startTime>";
        }
        description
          "Used with the optional replay feature to indicate the
         newest notifications of interest.  If <stopTime> is
         not present, the notifications will continue until the
         subscription is terminated.  Must be used with and be
         later than <startTime>.  Values of <stopTime> in the
         future are valid.  This parameter is of type dateTime and
         compliant to [RFC3339].  Implementations must support time
         zones.";
      }
    }  // grouping subscription-info-5277

    rpc create-subscription {
      description
        "This operation initiates an event notification subscription
       that will send asynchronous event notifications to the
       initiator of the command until the subscription terminates.";
      input {
        uses subscription-info-5277;
      }
    }  // rpc create-subscription
  }  // module ietf-5277-netconf