module openconfig-system {

    yang-version 1;

    namespace
      "http://openconfig.net/yang/system";

    prefix oc-sys;

    import openconfig-inet-types {
      prefix oc-inet;
    }
    import openconfig-yang-types {
      prefix oc-yang;
    }
    import openconfig-types {
      prefix oc-types;
    }
    import openconfig-extensions {
      prefix oc-ext;
    }
    import openconfig-aaa {
      prefix oc-aaa;
    }
    import openconfig-system-logging {
      prefix oc-log;
    }
    import openconfig-system-management {
      prefix oc-sys-mgmt;
    }
    import openconfig-system-terminal {
      prefix oc-sys-term;
    }
    import openconfig-procmon {
      prefix oc-proc;
    }
    import openconfig-alarms {
      prefix oc-alarms;
    }
    import openconfig-messages {
      prefix oc-messages;
    }
    import openconfig-license {
      prefix oc-license;
    }

    organization "OpenConfig working group";

    contact
      "OpenConfig working group
    netopenconfig@googlegroups.com";

    description
      "Model for managing system-wide services and functions on
    network devices.

    Portions of this code were derived from IETF RFC 7317.
    Please reproduce this note if possible.

    IETF code is subject to the following copyright and license:
    Copyright (c) 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).";

    revision "2020-03-25" {
      description
        "Fix typo in description statement for ipv4-address
      list.";
      reference
        "0.9.1";

    }

    revision "2020-01-07" {
      description
        "Add import of license management model.";
      reference
        "0.9.0";

    }

    revision "2019-03-15" {
      description
        "Update boot time to be nanoseconds since epoch.";
      reference
        "0.8.0";

    }

    revision "2019-01-29" {
      description
        "Add messages module to the system model";
      reference
        "0.7.0";

    }

    revision "2018-11-21" {
      description
        "Add OpenConfig module metadata extensions.";
      reference
        "0.6.1";

    }

    revision "2018-07-17" {
      description "Add gRPC server data";
      reference
        "0.6.0";

    }

    revision "2018-01-21" {
      description "Add cpu utilization data";
      reference
        "0.5.0";

    }

    revision "2017-12-15" {
      description
        "Add alarms to the system model";
      reference
        "0.4.0";

    }

    revision "2017-09-18" {
      description
        "Updated to use OpenConfig types modules";
      reference
        "0.3.0";

    }

    revision "2017-07-06" {
      description
        "Move to oc-inet types, add IETF attribution, add RADIUS
      counters, changed password leaf names to indicate hashed";
      reference
        "0.2.0";

    }

    revision "2017-01-29" {
      description "Initial public release";
      reference
        "0.1.0";

    }

    oc-ext:openconfig-version "0.9.1";
    oc-ext:regexp-posix;
    oc-ext:catalog-organization "openconfig";
    oc-ext:origin "openconfig";

    identity NTP_AUTH_TYPE {
      description
        "Base identity for encryption schemes supported for NTP
      authentication keys";
    }

    identity NTP_AUTH_MD5 {
      base NTP_AUTH_TYPE;
      description "MD5 encryption method";
    }

    typedef timezone-name-type {
      type string;
      description
        "A time zone name as used by the Time Zone Database,
       sometimes referred to as the 'Olson Database'.

       The exact set of valid values is an implementation-specific
       matter.  Client discovery of the exact set of time zone names
       for a particular server is out of scope.";
      reference
        "BCP 175: Procedures for Maintaining the Time Zone Database";

    }
  }  // module openconfig-system