<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
  xmlns:netconf="urn:ietf:params:xml:ns:netconf:base:1.0"
  xmlns:ncEvent="urn:ietf:params:xml:ns:netconf:notification:1.0"
  xmlns:inet="urn:ietf:params:xml:ns:inet-types"
  targetNamespace="urn:ietf:params:xml:ns:netconf:state"
  xmlns="urn:ietf:params:xml:ns:netconf:state"
  elementFormDefault="qualified">

  <!-- import base netconf definitions -->
  <xs:import namespace="urn:ietf:params:xml:ns:netconf:base:1.0"
    schemaLocation="netconf.xsd"/>

  <xs:import namespace="urn:ietf:params:xml:ns:netconf:notification:1.0"
  schemaLocation="notification.xsd"/>

  <xs:import namespace="urn:ietf:params:xml:ns:inet-types"
    schemaLocation="inet-ip.xsd"/>

  <!-- Model -->
  <xs:element name="netconf">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="capabilities" minOccurs="1" maxOccurs="1">
          <xs:annotation>
            <xs:documentation>
              The list of currently provided NETCONF capabilities.
              This may be different than those exchanged during
              session setup (i.e. hello).
            </xs:documentation>
          </xs:annotation>
          <xs:complexType>
            <xs:sequence>
              <xs:element name="capability" type="xs:anyURI"
                          maxOccurs="unbounded"/>
            </xs:sequence>
          </xs:complexType>
        </xs:element>

        <xs:element name="configurations" minOccurs="1" maxOccurs="1">
          <xs:annotation>
            <xs:documentation>
              Contains the NETCONF configurations data storesavailable
              on the device.
            </xs:documentation>
          </xs:annotation>
          <xs:complexType>
            <xs:sequence>
              <xs:element name="configuration"
                          type="ConfigurationDatastore"
                          minOccurs="0" maxOccurs="unbounded"/>
            </xs:sequence>
          </xs:complexType>
        </xs:element>

        <xs:element name="schemas" minOccurs="0" maxOccurs="1">
          <xs:annotation>
            <xs:documentation>
              Contains the list of supported schemas on the device.
              I.e. NETCONF data models, interface descriptions, etc.
            </xs:documentation>
          </xs:annotation>
          <xs:complexType>
            <xs:sequence>
              <xs:element name="schema" type="SchemaEntry"
                          minOccurs="0" maxOccurs="unbounded"/>
            </xs:sequence>
          </xs:complexType>
        </xs:element>

        <xs:element name="sessions" minOccurs="1" maxOccurs="1">
          <xs:annotation>
            <xs:documentation>
              Contains the details on active sessions on the device.
              Covers both NETCONF and non-NETCONF management sessions.
            </xs:documentation>
          </xs:annotation>
          <xs:complexType>
            <xs:sequence>
              <xs:element name="session" type="ManagementSession"
                          minOccurs="0" maxOccurs="unbounded"/>
            </xs:sequence>
          </xs:complexType>
        </xs:element>

        <xs:element name="subscriptions" minOccurs="0">
          <xs:annotation>
            <xs:documentation>
              Contains the details on active event stream
              subscriptions.  Includes active replay streams, if
              supported.
            </xs:documentation>
          </xs:annotation>
          <xs:complexType>
            <xs:sequence>
              <xs:element name="subscription" type="NetconfSubscription"
                          minOccurs="0" maxOccurs="unbounded"/>
            </xs:sequence>
          </xs:complexType>
        </xs:element>

        <xs:element name="statistics" type="ManagementStatistics"
                    minOccurs="0" maxOccurs="1">
          <xs:annotation>
            <xs:documentation>
              Contains  management metrics for the NETCONF server.
            </xs:documentation>
          </xs:annotation>
        </xs:element>
      </xs:sequence>
    </xs:complexType>
  </xs:element>

  <!-- Complex type definitions -->
  <xs:complexType name="ConfigurationDatastore">
    <xs:annotation>
      <xs:documentation>
        Contains information on the datastores available on
        the NETCONF server including locks.
      </xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name="name" type="NETCONFDatastoreType">
        <xs:annotation>
          <xs:documentation>
            enumeration of supported datastores; candidate,
            running, startup
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="locks" minOccurs="0">
        <xs:annotation>
          <xs:documentation>
            An indication of whether a resource is locked or
            unlocked.  If locked, additional information about
            the locking such as user an time stamp is provided.
          </xs:documentation>
        </xs:annotation>
        <xs:complexType>
          <xs:choice minOccurs="0">
            <xs:element name="globalLock" type="GlobalLock">
              <xs:annotation>
                <xs:documentation>
                  Present if a global lock is set.
                </xs:documentation>
              </xs:annotation>
            </xs:element>
            <xs:element name="partialLocks" type="PartialLock"
                        maxOccurs="unbounded">
              <xs:annotation>
                <xs:documentation>
                  Present if at least one partial lock is set.
                </xs:documentation>
              </xs:annotation>
            </xs:element>
          </xs:choice>
        </xs:complexType>
      </xs:element>
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="SchemaEntry">
    <xs:annotation>
      <xs:documentation>
        Contains the information used to describe the schema.
      </xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name="identifier" type="xs:string">
        <xs:annotation>
          <xs:documentation>
            Identifier to uniquely reference the schema.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="version" type="xs:string">
        <xs:annotation>
          <xs:documentation>
            Version of the schema supported.  Multiple versions can be
            supported simultaneously.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="format" type="SchemaFormat">
        <xs:annotation>
          <xs:documentation>
            Schema language for the file/module.  Eg: XSD, YANG, RNG.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="namespace" type="xs:anyURI">
        <xs:annotation>
          <xs:documentation>
            The XML namespace defined by the data model.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="location" minOccurs="0" maxOccurs="unbounded">
        <xs:annotation>
          <xs:documentation>
            A location from which the schema can be retrieved.  Can be
            either on the network device retrievable explicitly via
            the get-schema netconf operation (denoted by the value
            'NETCONF') or some network location (i.e. URL).
          </xs:documentation>
        </xs:annotation>
        <xs:simpleType>
          <xs:union>
            <xs:simpleType>
              <xs:restriction base="xs:string">
                <xs:enumeration value="NETCONF"/>
              </xs:restriction>
            </xs:simpleType>
            <xs:simpleType>
              <xs:restriction base="xs:anyURI">
              </xs:restriction>
            </xs:simpleType>
          </xs:union>
        </xs:simpleType>
      </xs:element>
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="ManagementSession">
    <xs:annotation>
      <xs:documentation>
        Contains information related to managment sessions on
        the device.
    </xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name="sessionId" type="netconf:SessionId">
        <xs:annotation>
          <xs:documentation>
            Unique identifier for the session instance.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="transport" type="TransportType">
        <xs:annotation>
          <xs:documentation>
            Identifies the transport for each session, e.g.
            "Console", "SSH".
          </xs:documentation>
        </xs:annotation>
      </xs:element>

      <xs:element name="protocol" type="ProtocolType">
        <xs:annotation>
          <xs:documentation>
            Identifies the protocol being used for each session,
            e.g. "NETCONF", "CLI", "WebUI".
          </xs:documentation>
        </xs:annotation>
      </xs:element>

      <xs:element name="username" type="xs:string">
        <xs:annotation>
          <xs:documentation>
            Session owner.
          </xs:documentation>
        </xs:annotation>
      </xs:element>

      <xs:element name="sourceHost" type="inet:host">
        <xs:annotation>
          <xs:documentation>
            Client for the session.
          </xs:documentation>
        </xs:annotation>
      </xs:element>

      <xs:element name="loginTime" type="xs:dateTime">
        <xs:annotation>
          <xs:documentation>
            Time at which the session was established.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="NetconfSubscription">
    <xs:annotation>
      <xs:documentation>
        Contains information on the active subscriptions on the
        NETCONF server.  Subscriptions which have ended are not
        reported.
      </xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name="sessionId" type="netconf:SessionId"/>
      <xs:element name="stream" type="ncEvent:streamNameType"/>
      <xs:element name="filter" type="netconf:filterInlineType"/>
      <xs:element name="startTime" type="xs:dateTime" minOccurs="0"/>
      <!-- stopTime is optional on servers with replay support -->
      <xs:element name="stopTime" type="xs:dateTime" minOccurs="0"/>
      <xs:element name="messagesSent" type="xs:unsignedInt"/>
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="ManagementStatistics">
    <xs:annotation>
      <xs:documentation>
        Contains management statistics for the NETCONF server.
    </xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name="netconfStartTime" type="xs:dateTime">
        <xs:annotation>
          <xs:documentation>
            Date and time at which the NETCONF server process was
            started.  Allows for calculation of time interval for
            reported metrics.
        </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="inSessions" type="xs:unsignedInt">
        <xs:annotation>
          <xs:documentation>
            The total number of NETCONF sessions started towards the
            NETCONF peer.
            inSessions - inBadHellos = 'number of correctly started
                                          netconf sessions'
        </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="inXMLParseErrors" type="xs:unsignedInt">
        <xs:annotation>
          <xs:documentation>
            The total number of messages that were unparsable and thus
            ignored.  This covers both unparsable 'hello' and 'rpc'
            messages.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="inBadHellos" type="xs:unsignedInt">
        <xs:annotation>
          <xs:documentation>
            The total number of sessions silently dropped because an
            invalid 'hello' message was received.  This includes hello
            messages with a 'session-id' attribute, bad namespace, and
            bad capability declarations.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="inRpcs" type="xs:unsignedInt">
        <xs:annotation>
          <xs:documentation>
            The total number of rpc requests received.
        </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="inBadRpcs" type="xs:unsignedInt">
        <xs:annotation>
          <xs:documentation>
            The total number of rpcs which were parsed correctly, but
            couldn't be serviced because they contained non-conformant
            XML, e.g. missing a mandatory parameter.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="inNotSupportedRpcs" type="xs:unsignedInt">
        <xs:annotation>
          <xs:documentation>
            The total number of rpcs which were parsed correctly, but
            couldn't be serviced because they were not supported by
            the agent.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="outRpcReplies" type="xs:unsignedInt">
        <xs:annotation>
          <xs:documentation>
            The total number of 'rpc-reply' messages sent.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="outRpcErrors" type="xs:unsignedInt">
        <xs:annotation>
          <xs:documentation>
            The total number of 'rpc-reply' messages with
            'rpc-error' sent.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="outNotifications" type="xs:unsignedInt">
        <xs:annotation>
          <xs:documentation>
            The total number of 'notification' messages sent.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="NETCONFDatastoreType">
    <xs:annotation>
      <xs:documentation>
        Enumeration of possible NETCONF datastore types.
      </xs:documentation>
    </xs:annotation>
    <xs:choice >
      <xs:element name="startup" type="xs:string"/>
      <xs:element name="candidate" type="xs:string"/>
      <xs:element name="running" type="xs:string"/>
    </xs:choice>
  </xs:complexType>

  <xs:complexType name="GlobalLock">
    <xs:sequence>
      <xs:element name="lockedBySession"
                  type="netconf:SessionId">
        <xs:annotation>
          <xs:documentation>
            The session Id which holds the lock.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="lockedTime"
                  type="xs:dateTime">
        <xs:annotation>
          <xs:documentation>
            Date and Time the lock was acquired.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="PartialLock">
    <xs:sequence>
      <xs:element name="lockId" type="xs:unsignedInt">
        <xs:annotation>
          <xs:documentation>
            For a partial lock this provides the lock id.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="lockedBySession"
                  type="netconf:SessionId">
        <xs:annotation>
          <xs:documentation>
            The session Id which holds the lock.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="lockedTime"
                  type="xs:dateTime">
        <xs:annotation>
          <xs:documentation>
            Date and Time the lock was acquired.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="select" maxOccurs="unbounded">
        <xs:annotation>
          <xs:documentation>
            The xpath expression which was used to request the lock.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="lockedNodes"
                  minOccurs="0" maxOccurs="unbounded">
        <xs:annotation>
          <xs:documentation>
            The list of instance-identifiers (i.e. the locked nodes).
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:sequence>
  </xs:complexType>


 <!-- Simple types -->
  <xs:simpleType name="SchemaFormat">
    <xs:annotation>
      <xs:documentation>
        Format of the schema.
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base="xs:string">
      <xs:enumeration value="XSD"/>
      <xs:enumeration value="YANG"/>
      <xs:enumeration value="RNG"/>
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="TransportType">
    <xs:annotation>
      <xs:documentation>
        Transport choices.
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base="xs:string">
      <xs:enumeration value="SSH"/>
      <xs:enumeration value="SSL"/>
      <xs:enumeration value="Console"/>
      <xs:enumeration value="HTTP"/>
      <xs:enumeration value="HTTPS"/>
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="ProtocolType">
    <xs:annotation>
      <xs:documentation>
        Protocol choices.
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base="xs:string">
      <xs:enumeration value="CLI"/>
      <xs:enumeration value="NETCONF"/>
      <xs:enumeration value="WebUI"/>
    </xs:restriction>
  </xs:simpleType>

  <!-- RPC Definitions -->
  <xs:element name="get-schema"
              substitutionGroup="netconf:rpcOperation">
    <xs:annotation>
      <xs:documentation>
        RPC definition:  &lt;get-schema&gt;
      </xs:documentation>
    </xs:annotation>
  <xs:complexType>
    <xs:complexContent>
      <xs:extension base="netconf:rpcOperationType">
        <xs:sequence>
          <xs:element name="identifier" type="xs:string"/>
          <xs:element name="version" type="xs:string"/>
          <xs:element name="format" type="SchemaFormat"/>
        </xs:sequence>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  </xs:element>
</xs:schema>