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SACM Working Group                                           H. Birkholz
Internet-Draft                                            Fraunhofer SIT
Intended status: Standards Track                           N. Cam-Winget
Expires: January 20, 2018                                  Cisco Systems
                                                           July 19, 2017


           YANG subscribed notifications via SACM Statements
                  draft-birkholz-sacm-yang-content-00

Abstract

   This document summarizes the data model designed at the IETF 99
   Hackathon and is intended to grow in to a definition of general XML
   SACM statements (and later JSON and CBOR, respectively) for virtually
   every kind of Content Element (e.g. software identifiers, assessment
   guidance/results, ECA Policy rules, VDD, etc.).  The SACM Statement
   data structure is based on the Information Element (IE) definitions
   provided by the SACM Information Model.  The initial Content Element
   type transferred are YANG Subscribed Notification acquired via YANG
   push.  In combination with the Origin Metadata Annotation defined in
   draft-ietf-netmod-revised-datastores the data model defined in this
   document will ultimately be able to express collected endpoint
   characteristics, imperative guidance that define and orchestrate
   assessment instructions, and also the declarative guidance for
   endpoint attributes.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on January 20, 2018.








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Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements notation . . . . . . . . . . . . . . . . . . . .   3
   3.  Brokering of YANG push telemetry via SACM statements  . . . .   3
   4.  Encapsulation of YANG notifications in SACM content-elements    3
     4.1.  Enumeration definition for content-type . . . . . . . . .   4
     4.2.  Element definition for content-metadata . . . . . . . . .   4
     4.3.  Definition of the yang-output-metadata element included
           in content-metadata . . . . . . . . . . . . . . . . . . .   5
   5.  SACM Component Composition  . . . . . . . . . . . . . . . . .   7
   6.  IANA considerations . . . . . . . . . . . . . . . . . . . . .   7
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   7
   9.  Change Log  . . . . . . . . . . . . . . . . . . . . . . . . .   7
   10. Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   7
   11. Normative References  . . . . . . . . . . . . . . . . . . . .   7
   Appendix A.  Minimal SACM Statement Definition for YANG Output  .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  27

1.  Introduction

   YANG modules are a powerful established tool to provide endpoint
   attributes (IE) with well-defined semantics.  YANG push
   [I-D.ietf-netconf-yang-push] and the corresponding YANG subscribed
   notification [I-D.ietf-netconf-subscribed-notifications] drafts make
   use of these modules to create streams of notifications (telemetry)
   providing SACM content on the data plane.  Correspondingly, filter
   expressions used in the context of YANG subscriptions constitute SACM
   content that is imperative guidance consumed by SACM components on
   the management plane.





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   The SACM component illustrated in this draft incorporates a YANG Push
   client function and an xmpp-grid publisher function.  The output of
   the YANG Push client function is encapsulated in a SACM Content
   Element envelope, which is again encapsulated in a SACM statement
   envelope.  The corresponding SACM statements are published via the
   xmpp-grid publisher function into a SACM Domain.

2.  Requirements notation

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in RFC
   2119, BCP 14 [RFC2119].

3.  Brokering of YANG push telemetry via SACM statements

   Every SACM content is published into a SACM domain using a statement
   envelope/encapsulation.  The general structure of a Statement is
   based in the Information Element defintion in
   [I-D.ietf-sacm-information-model] and can be summarized as follows:

   o  a statement encapsulates statement-metadata and content-elements

   o  a content-element encapsulates content-metadata and SACM content

   In the scope of this document, only one type of SACM content is
   covered: YANG output.  Correspondingly, only the minimal required
   structure of statements, statement-metadata, content-elements, and
   content-metadata are defined.  A complete XML schema definition of
   this minimal statement can be found in Appendix A.

4.  Encapsulation of YANG notifications in SACM content-elements

   A YANG notification is associated with a set of YANG specific
   metadata.  Hence, a YANG notification published to a SACM Domain MUST
   be encapsulated with its corresponding metadata in a Content Element
   as defined below.

   YANG output that is SACM content is represented as an element
   defintion included in the content choice of the content-element.











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<CODE BEGINS>
<xs:complexType name="content-element">
  <xs:sequence>
    <xs:element name="content-metadata" type="content-metadata" maxOccurs="unbounded"/>
    <xs:choice>
      <xs:element name="yang-output" type="yang-output" />
        <!-- There is only one element here now, but virtually every other content choice
             will go here, i.e. data models, such as OVAL, SCAP, SWID, etc. -->
    </xs:choice>
  </xs:sequence>
</xs:complexType>
<CODE ENDS>

4.1.  Enumeration definition for content-type

   One occurrence of the yang-output element MUST be instantiated in the
   content-metadata element if YANG push output is to be transferred.
   Also, the content-type must be set to the enumeration value "yang-
   output", respectively.

   In general, the list of content-type enumerations is including every
   subject as defined in the SACM Information Model.  For the scope of
   this document, the list of potential content is reduced to "yang-
   output" only.

<CODE BEGINS>
<xs:simpleType name="content-type">
  <xs:restriction base="xs:string">
    <xs:enumeration value="yang-output" />
       <!-- There is only one type here now, but virtually every other content-type
            will go here, i.e. data models, such as OVAL, SCAP, SWID, etc. -->
  </xs:restriction>
</xs:simpleType>
<CODE ENDS>

4.2.  Element definition for content-metadata

   The list of optional elements included in content-metadata will
   incorporate any every potential metadata type.  For the scope of this
   document, the list of elements is also limited to the minimal
   required set of metadata elements and the yang-output metadata
   element to support the encapsulation of NETCONF subscribed
   notifications and YANG query result.  As defined above, one
   occurrence of the yang-output element has to be included in the
   content-metadata element.

   The general content-metadata elements are illustrated in the
   Appendix A.



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<CODE BEGINS>
<xs:complexType name="content-metadata">
  <xs:sequence>
    <xs:element name="content-element-guid" type="content-element-guid"/>
    <xs:element name="content-creation-timestamp" type="content-creation-timestamp"/>
    <xs:element name="content-topic" type="content-topic"/>
    <xs:element name="content-type" type="content-type"/>
    <xs:element name="data-source" type="data-source" minOccurs="0"/>
    <xs:element name="data-origin" type="data-origin" minOccurs="0"/>
    <xs:element name="relationship" type="relationship" minOccurs="0" maxOccurs="unbounded"/>
    <xs:element name="yang-output-metadata" type="yang-output-metadata" minOccurs="0"/>
  </xs:sequence>
</xs:complexType>
<CODE ENDS>

4.3.  Definition of the yang-output-metadata element included in
      content-metadata

   The composition of metadata that can be associated with a XML NETCONF
   result depends on multiple factors:

   o  acquisition method: query / subscription

   o  encoding: XML / JSON / CBOR

   o  subscription interval: periodic / on-change

   o  filter-type: xpath / subtree

   Additionally, the actual filter expression (or in future iterations
   of this work a referencing label, such as a URI, UUID or other
   composed identifier) has to be included in the content-metadata.



















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<CODE BEGINS>
<xs:complexType name="yang-output-metadata">
  <xs:sequence>
    <xs:choice maxOccurs="1">
      <xs:element name="yang-query" type="yang-query" />
      <xs:element name="yang-subscribe" type="yang-subscribe" />
    </xs:choice>
    <xs:element name="encoding" type="yang-encoding" />
    <xs:element name="module-names" type="module-name" minOccurs="0" maxOccurs="unbounded" />
  </xs:sequence>
</xs:complexType>

<xs:complexType name="yang-subscribe">
  <xs:restriction base="xs:NMTOKEN">
    <xs:enumeration value="periodic" />
    <xs:enumeration value="on-change" />
  </xs:restriction>
  <xs:restriction base="xs:NMTOKEN">
    <xs:enumeration value="xpath" />
    <xs:enumeration value="subtree" />
  </xs:restriction>
<xs:complexType>

<xs:simpleType name="filter-expression">
  <xs:restriction base="xs:string" />
</xs:simpleType>

<xs:simpleType name="yang-query">
  <xs:restriction base="xs:string" />
</xs:simpleType>

<xs:simpleType name="yang-encoding">
  <xs:restriction base="xs:NMTOKEN">
    <xs:enumeration value="netconf" />
    <xs:enumeration value="restconf" />
    <xs:enumeration value="comi" />
  </xs:restriction>
</xs:simpleType>

<xs:simpleType name="module-name">
  <xs:restriction base="xs:string" />
</xs:simpleType>
<CODE ENDS>








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5.  SACM Component Composition

   A SACM Component able to process YANG subscribed notifications
   requires at least two functions:

   o  a YANG push client function [I-D.ietf-netconf-yang-push],
      [I-D.ietf-netconf-subscribed-notifications]

   o  an xmpp-grid provider function [I-D.ietf-mile-xmpp-grid]

   Orchestattion of functions inside a component, their discovery as
   capabiliites and the internal communication of SACM content inside a
   SACM component is out of scope of this document for now.

6.  IANA considerations

   This document includes requests to IANA.

7.  Security Considerations

   TBD

8.  Acknowledgements

   Christoph Vigano, Guangying Zheng, Eric Voit, Alexander Clemm

9.  Change Log

   First version -00

10.  Contributors

11.  Normative References

   [I-D.ietf-mile-xmpp-grid]
              Cam-Winget, N., Appala, S., and S. Pope, "Using XMPP
              Protocol and its Extensions for Use with IODEF", draft-
              ietf-mile-xmpp-grid-03 (work in progress), July 2017.

   [I-D.ietf-netconf-subscribed-notifications]
              Voit, E., Clemm, A., Prieto, A., Nilsen-Nygaard, E., and
              A. Tripathy, "Custom Subscription to Event Notifications",
              draft-ietf-netconf-subscribed-notifications-03 (work in
              progress), July 2017.







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   [I-D.ietf-netconf-yang-push]
              Clemm, A., Voit, E., Prieto, A., Tripathy, A., Nilsen-
              Nygaard, E., Bierman, A., and B. Lengyel, "Subscribing to
              YANG datastore push updates", draft-ietf-netconf-yang-
              push-07 (work in progress), June 2017.

   [I-D.ietf-sacm-information-model]
              Waltermire, D., Watson, K., Kahn, C., Lorenzin, L., Cokus,
              M., Haynes, D., and H. Birkholz, "SACM Information Model",
              draft-ietf-sacm-information-model-10 (work in progress),
              April 2017.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <http://www.rfc-editor.org/info/rfc2119>.

Appendix A.  Minimal SACM Statement Definition for YANG Output

   The definitions of statements, statement-metadata, content-element,
   and content-metadata are provided by the SACM Information Model
   [I-D.ietf-sacm-information-model].

   Due to the stripping down of content-elements to YANG output, the
   enumerations still included in the relationship type are not able to
   point to other content actually.

<CODE BEGINS>
<?xml version="1.0"?>
<xs:schema version="1.0"
           xmlns:xs="http://www.w3.org/2001/XMLSchema"
           elementFormDefault="qualified">

  <xs:complexType name="StatementMetadata">
    <xs:sequence>
      <xs:element name="statement-guid" type="statement-guid" />
      <xs:element name="data-origin" type="data-origin" />
      <xs:element name="statement-creation-timestamp" type="statement-creation-timestamp" minOccurs="0" />
      <xs:element name="statement-publish-timestamp" type="statement-creation-timestamp" />
      <xs:element name="statement-type" type="statement-type" />
      <xs:element name="content-elements" type="content-elements" />
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="sacm-statement">
    <xs:sequence>
      <xs:element name="statement-metadata" type="StatementMetadata" />
      <xs:element name="content-element" type="content-element" minOccurs="1" maxOccurs="unbounded" />



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    </xs:sequence>
  </xs:complexType>

  <xs:element name="sacm-statement" type="sacm-statement">
  </xs:element>

  <xs:simpleType name="statement-guid">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="decimal-fraction-denominator">
    <xs:restriction base="xs:integer" />
  </xs:simpleType>

  <xs:simpleType name="decimal-fraction-numerator">
    <xs:restriction base="xs:integer" />
  </xs:simpleType>

  <xs:simpleType name="content-elements">
    <xs:restriction base="xs:integer" />
  </xs:simpleType>

  <xs:complexType name="statement-creation-timestamp">
    <xs:sequence>
      <xs:element name="decimal-fraction-denominator" type="decimal-fraction-denominator"/>
      <xs:element name="decimal-fraction-numerator" type="decimal-fraction-numerator"/>
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="content-creation-timestamp">
    <xs:sequence>
      <xs:element name="decimal-fraction-denominator" type="decimal-fraction-denominator"/>
      <xs:element name="decimal-fraction-numerator" type="decimal-fraction-numerator"/>
    </xs:sequence>
  </xs:complexType>

  <xs:simpleType name="statement-type">
    <xs:restriction base="xs:string">
      <xs:enumeration value="Observation" />
      <xs:enumeration value="DirectoryContent" />
      <xs:enumeration value="Correlation" />
      <xs:enumeration value="Assessment" />
      <xs:enumeration value="Guidance" />
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="content-topic">
    <xs:restriction base="xs:string">



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      <xs:enumeration value="Session" />
      <xs:enumeration value="User" />
      <xs:enumeration value="Interface" />
      <xs:enumeration value="PostureProfile" />
      <xs:enumeration value="Flow" />
      <xs:enumeration value="PostureAssessment" />
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="content-type">
    <xs:restriction base="xs:string">
      <xs:enumeration value="EndpointConfiguration" />
      <xs:enumeration value="EndpointState" />
      <xs:enumeration value="DirectoryEntry" />
      <xs:enumeration value="Event" />
      <xs:enumeration value="Incident" />
      <xs:enumeration value="yang-output" />
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="content-element-guid">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:complexType name="yang-output-metadata">
    <xs:sequence>
      <xs:choice maxOccurs="1">
        <xs:element name="yang-query" type="yang-query" />
        <xs:element name="yang-subscribe" type="yang-subscribe" />
      </xs:choice>
      <xs:element name="encoding" type="yang-encoding" />
      <xs:element name="module-names" type="module-name" minOccurs="0" maxOccurs="unbounded" />
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="yang-subscribe">
    <xs:restriction base="xs:NMTOKEN">
      <xs:enumeration value="periodic" />
      <xs:enumeration value="on-change" />
    </xs:restriction>
    <xs:restriction base="xs:NMTOKEN">
      <xs:enumeration value="xpath" />
      <xs:enumeration value="subtree" />
    </xs:restriction>
  </xs:complexType>

  <xs:simpleType name="filter-expression">
    <xs:restriction base="xs:string" />



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  </xs:simpleType>

  <xs:simpleType name="yang-query">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="yang-encoding">
    <xs:restriction base="xs:NMTOKEN">
      <xs:enumeration value="netconf" />
      <xs:enumeration value="restconf" />
      <xs:enumeration value="comi" />
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="module-name">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="relationship-type">
    <xs:restriction base="xs:string">
      <xs:enumeration value="associated_with_user" />
      <xs:enumeration value="applies_to_session" />
      <xs:enumeration value="seen_on_interface" />
      <xs:enumeration value="associated_with_flow" />
      <xs:enumeration value="contains_virtual_device" />
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="relationship-content-element-guid">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="relationship-statement-guid">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="relationship-object-label">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="data-source-label">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="data-origin">
    <xs:restriction base="xs:string" />
  </xs:simpleType>




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  <xs:simpleType name="host-name">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="administrative-domain-label">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="sub-administrative-domain">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="super-administrative-domain">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:complexType name="relationship">
    <xs:sequence>
      <xs:element name="relationship-type" type="relationship-type" />
      <xs:element name="relationship-content-element-guid" type="relationship-content-element-guid" minOccurs="0" maxOccurs="unbounded" />
      <xs:element name="relationship-statement-guid" type="relationship-statement-guid" minOccurs="0" maxOccurs="unbounded" />
      <xs:element name="relationship-object-label" type="relationship-object-label" minOccurs="0" maxOccurs="unbounded" />
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="flow-element">
    <xs:sequence>
      <xs:element name="network-address" type="network-address"/>
      <xs:element name="layer4-port-address" type="layer4-port-address" />
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="flow-record">
    <xs:sequence>
      <xs:element name="src-flow-element" type="flow-element" />
      <xs:element name="dst-flow-element" type="flow-element" />
      <xs:element name="protocol" type="protocol" />
      <xs:element name="layer4-protocol" type="layer4-protocol" />
      <xs:element name="flow-statistics" type="flow-statistics" />
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="content-metadata">
    <xs:sequence>
      <xs:element name="content-element-guid" type="content-element-guid" />
      <xs:element name="content-creation-timestamp" type="content-creation-timestamp" />
      <xs:element name="content-topic" type="content-topic" />
      <xs:element name="content-type" type="content-type" />



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      <xs:element name="data-source" type="data-source" minOccurs="0" />
      <xs:element name="data-origin" type="data-origin" minOccurs="0" />
      <xs:element name="relationship" type="relationship" minOccurs="0" maxOccurs="unbounded"/>
      <xs:element name="yang-output-metadata" type="yang-output-metadata" minOccurs="0"/>
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="content-element">
    <xs:sequence>
      <xs:element name="content-metadata" type="content-metadata" maxOccurs="unbounded"/>
      <xs:choice maxOccurs="unbounded">
        <xs:element name="yang-output" type="yang-output" />
        <xs:element name="flow" type="flow-record" />
        <xs:element name="posture" type="xs:string" />
        <xs:element name="user" type="user" />
        <xs:element name="session" type="session" />
        <xs:element name="ethernet-interface" type="ethernet-interface" />
        <xs:element name="target-endpoint" type="target-endpoint" />
        <xs:element name="port" type="port" />
        <xs:element name="posture-assessment" type="posture-assessment" />
      </xs:choice>
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="posture-assessment"></xs:complexType>

  <xs:complexType name="target-endpoint">
    <xs:sequence>
      <xs:element name="host-name" type="host-name" />
      <xs:element name="te-label" type="te-label" />
      <xs:element name="administrative-domain" type="administrative-domain" minOccurs="0" />
      <xs:element name="application-instance" type="application-instance" minOccurs="0" maxOccurs="unbounded" />
      <xs:element name="ethernet-interface" type="ethernet-interface" minOccurs="0" maxOccurs="unbounded" />
      <xs:element name="address-association" type="address-association" minOccurs="0" maxOccurs="unbounded" />
      <xs:element name="data-source" type="data-source" minOccurs="0" />
      <xs:element name="operating-system" type="operating-system" minOccurs="0" />
    </xs:sequence>
  </xs:complexType>

  <xs:simpleType name="te-label">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:complexType name="application-instance">
    <xs:sequence>
      <xs:element name="application-label" type="application-label" />
      <xs:element name="target-endpoint" type="target-endpoint" />
    </xs:sequence>



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  </xs:complexType>

  <xs:simpleType name="attribute-name">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="attribute-value">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:complexType name="attribute-value-pair">
    <xs:sequence>
      <xs:element name="attribute-name" type="attribute-name" />
      <xs:element name="attribute-value" type="attribute-value" />
    </xs:sequence>
  </xs:complexType>

  <xs:simpleType name="application-label">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="application-name">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="application-version">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="application-manufacturer">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <!--     TODO: is it possible to declare this as an enumeration or is that unrealistic? -->
  <xs:simpleType name="application-type">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="application-component">
    <xs:restriction base="xs:string" />
  </xs:simpleType>



  <xs:complexType name="application">
    <xs:sequence>
      <xs:element name="application-label" type="application-label" minOccurs="0" />
      <xs:element name="application-name" type="application-name" />



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      <xs:element name="application-type" type="application-type" minOccurs="0" maxOccurs="unbounded" />
      <xs:element name="application-component" type="application-component" minOccurs="0" maxOccurs="unbounded" />
      <xs:element name="application-manufacturer" type="application-manufacturer" minOccurs="0" />
      <xs:element name="application-version" type="application-version" minOccurs="0" />
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="address-association">
    <xs:sequence>
      <xs:element name="address" type="address" />
      <xs:element name="address-association-type" type="address-association-type" />
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="address">
    <xs:sequence>
      <xs:element name="address-mask-value" type="address-mask-value" />
      <xs:element name="address-type" type="address-type" />
      <xs:element name="address-value" type="address-value" />
    </xs:sequence>
  </xs:complexType>

  <xs:simpleType name="address-type">
    <xs:restriction base="xs:string">
      <xs:enumeration value="Ethernet" />
      <xs:enumeration value="ZigBee" />
      <xs:enumeration value="ModBus" />
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="session-state-type">
    <xs:restriction base="xs:string">
      <xs:enumeration value="Authenticating"></xs:enumeration>
      <xs:enumeration value="Authenticated"></xs:enumeration>
      <xs:enumeration value="Postured"></xs:enumeration>
      <xs:enumeration value="Started"></xs:enumeration>
      <xs:enumeration value="Disconnected"></xs:enumeration>
    </xs:restriction>
  </xs:simpleType>

  <xs:complexType name="session">
    <xs:sequence>
      <xs:element name="session-state-type" type="session-state-type" />
      <!-- TODO: add additional elements for Session Type -->
    </xs:sequence>
  </xs:complexType>

  <xs:simpleType name="user-id">



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    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="username">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="user-directory">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:complexType name="user">
    <xs:sequence>
      <xs:element name="user-id" type="user-id" />
      <xs:element name="username" type="username" minOccurs="0" />
      <xs:element name="data-source" type="data-source" minOccurs="0" />
      <xs:element name="user-directory" type="user-directory" minOccurs="0" />
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="ethernet-interface">
    <xs:sequence>
      <xs:element name="interface-label" type="interface-label" />
      <xs:element name="network-interface-name" type="network-interface-name" minOccurs="0"/>
      <xs:element name="mac-address" type="mac-address" />
      <xs:element name="network-name" type="network-name" minOccurs="0"/>
      <xs:element name="network-id" type="network-id" minOccurs="0"/>
      <xs:element name="layer2-interface-type" type="layer2-interface-type" minOccurs="0"/>
      <xs:element name="sub-interface-label" type="sub-interface-label" minOccurs="0" maxOccurs="unbounded"/>
      <xs:element name="super-interface-label" type="super-interface-label" minOccurs="0" maxOccurs="unbounded"/>
    </xs:sequence>
  </xs:complexType>

  <xs:simpleType name="event-type">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="event-threshold">
    <xs:restriction base="xs:integer" />
  </xs:simpleType>

  <xs:simpleType name="event-threshold-name">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="event-trigger">
    <xs:restriction base="xs:string" />
  </xs:simpleType>



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  <xs:simpleType name="timestamp-type">
    <xs:restriction base="xs:string">
      <xs:enumeration value="discovered" />
      <xs:enumeration value="classified" />
      <xs:enumeration value="collected" />
      <xs:enumeration value="published" />
    </xs:restriction>
  </xs:simpleType>

  <xs:complexType name="typed-timestamp">
    <xs:sequence>
      <xs:element name="decimal-fraction-denominator" type="decimal-fraction-denominator"/>
      <xs:element name="decimal-fraction-numerator" type="decimal-fraction-numerator"/>
      <xs:element name="timestamp-type" type="timestamp-type" />
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="event">
    <xs:sequence>
      <xs:element name="event-type" type="event-type" minOccurs="0" />
      <xs:element name="event-threshold" type="event-threshold" minOccurs="0" />
      <xs:element name="event-threshold-name" type="event-threshold-name" minOccurs="0" />
      <xs:element name="event-trigger" type="event-trigger" minOccurs="0" />
      <xs:element name="typed-timestamp" type="typed-timestamp" />
      <xs:element name="content" type="xs:anySimpleType" />
    </xs:sequence>
  </xs:complexType>

  <xs:simpleType name="os-label">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="os-name">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="os-type">
    <xs:restriction base="xs:string">
      <xs:enumeration value="real-time" />
      <xs:enumeration value="consumer" />
      <xs:enumeration value="server" />
      <xs:enumeration value="security-enhanced" />
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="os-component">
    <xs:restriction base="xs:string" />
  </xs:simpleType>



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  <xs:simpleType name="os-manufacturer">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="os-version">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:complexType name="operating-system">
    <xs:sequence>
      <xs:element name="os-label" type="os-label" minOccurs="0" />
      <xs:element name="os-name" type="os-name" />
      <xs:element name="os-type" type="os-type" minOccurs="0" maxOccurs="unbounded" />
      <xs:element name="os-component" type="os-component" minOccurs="0" maxOccurs="unbounded"/>
      <xs:element name="os-manufacturer" type="os-manufacturer" minOccurs="0" />
      <xs:element name="os-version" type="os-version" minOccurs="0" />
    </xs:sequence>
  </xs:complexType>

  <xs:simpleType name="sub-interface-label">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="super-interface-label">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="address-association-type">
    <xs:restriction base="xs:string">
      <xs:enumeration value="broadcast-domain-member-list" />
      <xs:enumeration value="ip-subnet-member-list" />
      <xs:enumeration value="ip-mac" />
      <xs:enumeration value="shared-backhaul-interface" />
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="address-mask-value">
    <xs:restriction base="xs:string" />
  </xs:simpleType>
  <xs:simpleType name="address-value">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="interface-label">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="network-name">



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    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="network-id">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="network-interface-name">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="layer2-interface-type">
    <xs:restriction base="xs:string">
      <xs:enumeration value="fastEther" />
      <xs:enumeration value="fastEtherFX" />
      <xs:enumeration value="gigabitEthernet" />
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="ipv6-address-subnet-mask-cidrnot">
    <xs:restriction base="xs:string">
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name="ipv6-address-value">
    <xs:restriction base="xs:string">
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="ipv4-address-subnet-mask-cidrnot">
    <xs:restriction base="xs:string">
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name="ipv4-address-subnet-mask">
    <xs:restriction base="xs:string">
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name="ipv4-address-value">
    <xs:restriction base="xs:string">
    </xs:restriction>
  </xs:simpleType>

  <xs:complexType name="network-address">
    <xs:choice>
      <xs:element name="ipv4-address" type="ipv4-address" />
      <xs:element name="ipv6-address" type="ipv6-address" />
      <xs:element name="mac-address" type="mac-address" />
    </xs:choice>
  </xs:complexType>



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  <xs:complexType name="endpoint-identifier">
    <xs:choice>
      <xs:element name="certificate" type="certificate" />
      <xs:element name="firmware-id" type="firmware-id" />
      <xs:element name="hardware-serial-number" type="hardware-serial-number" />
      <xs:element name="host-name" type="host-name" />
      <xs:element name="ipv4-address-value" type="ipv4-address-value" />
      <xs:element name="ipv6-address-value" type="ipv6-address-value" />
      <xs:element name="mac-address" type="mac-address" />
      <xs:element name="public-key" type="public-key" />
      <xs:element name="username" type="username" />
    </xs:choice>
  </xs:complexType>

  <xs:complexType name="ipv4-address">
    <xs:sequence>
      <xs:element name="ipv4-address-value" type="ipv4-address-value" />
      <xs:element name="ipv4-address-subnet-mask-cidrnot" type="ipv4-address-subnet-mask-cidrnot"/>
      <xs:element name="ipv4-address-subnet-mask" type="ipv4-address-subnet-mask"/>
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="ipv6-address">
    <xs:sequence>
      <xs:element name="ipv6-address-value" type="ipv6-address-value" />
      <xs:element name="ipv6-address-subnet-mask-cidrnot" type="ipv6-address-subnet-mask-cidrnot"/>
    </xs:sequence>
  </xs:complexType>

  <xs:simpleType name="mac-address">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="layer4-port-address">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="protocol">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="layer4-protocol">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="bytes-received">
    <xs:restriction base="xs:integer" />
  </xs:simpleType>



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  <xs:simpleType name="bytes-sent">
    <xs:restriction base="xs:integer" />
  </xs:simpleType>

  <xs:simpleType name="units-received">
    <xs:restriction base="xs:integer" />
  </xs:simpleType>

  <xs:simpleType name="units-sent">
    <xs:restriction base="xs:integer" />
  </xs:simpleType>

  <xs:complexType name="flow-statistics">
    <xs:sequence>
      <xs:element name="bytes-received" type="bytes-received" />
      <xs:element name="bytes-sent" type="bytes-sent" />
      <xs:element name="units-received" type="units-received" />
      <xs:element name="units-sent" type="units-sent" />
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="person">
    <xs:sequence>
      <xs:element name="person-first-name" type="person-first-name" />
      <xs:element name="person-last-name" type="person-last-name" />
      <xs:element name="person-middle-name" type="person-middle-name" minOccurs="0" maxOccurs="unbounded" />
      <xs:element name="phone-contact" type="phone-contact" minOccurs="0" maxOccurs="unbounded" />
      <xs:element name="email-address" type="email-address" minOccurs="0" maxOccurs="unbounded" />
    </xs:sequence>
  </xs:complexType>

  <xs:simpleType name="person-first-name">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="person-last-name">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="person-middle-name">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="email-address">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:complexType name="phone-contact">



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    <xs:sequence>
      <xs:element name="phone-number" type="phone-number" />
      <xs:element name="phone-number-type" type="phone-number-type" minOccurs="0" />
    </xs:sequence>
  </xs:complexType>

  <xs:simpleType name="phone-number">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="phone-number-type">
    <xs:restriction base="xs:string">
      <xs:enumeration value="DSN" />
      <xs:enumeration value="Fax" />
      <xs:enumeration value="Home" />
      <xs:enumeration value="Mobile" />
      <xs:enumeration value="Pager" />
      <xs:enumeration value="Secure" />
      <xs:enumeration value="Unsecure" />
      <xs:enumeration value="Work" />
      <xs:enumeration value="Other" />
    </xs:restriction>
  </xs:simpleType>

  <xs:complexType name="privilege">
    <xs:sequence>
      <xs:element name="privilege-name" type="privilege-name" />
      <xs:element name="privilege-value" type="privilege-value" />
    </xs:sequence>
  </xs:complexType>

  <xs:simpleType name="privilege-name">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="privilege-value">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:complexType name="location">
    <xs:sequence>
      <xs:element name="WGS84-longitude" type="WGS84-longitude" />
      <xs:element name="WGS84-latitude" type="WGS84-latitude" />
      <xs:element name="WGS84-altitude" type="WGS84-altitude" />
    </xs:sequence>
  </xs:complexType>

  <xs:simpleType name="WGS84-longitude">



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    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="WGS84-latitude">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="WGS84-altitude">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="organization-id">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="organization-name">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:complexType name="organization">
    <xs:sequence>
      <xs:element name="organization-id" type="organization-id" />
      <xs:element name="organization-name" type="organization-name" />
      <xs:element name="location" type="location" minOccurs="0" />
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="data-source">
    <xs:sequence>
      <xs:element name="data-source-label" type="data-source-label" minOccurs="0" />
      <xs:element name="endpoint-identifier" type="endpoint-identifier" minOccurs="0" maxOccurs="unbounded" />
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="administrative-domain">
    <xs:sequence>
      <xs:element name="administrative-domain-label" type="administrative-domain-label" />
      <xs:element name="sub-administrative-domain" type="sub-administrative-domain" minOccurs="0" maxOccurs="unbounded" />
      <xs:element name="super-administrative-domain" type="super-administrative-domain" minOccurs="0" />
      <xs:element name="location" type="location" minOccurs="0" />
    </xs:sequence>
  </xs:complexType>

  <xs:simpleType name="access-privilege-type">
    <xs:restriction base="xs:string">
      <xs:enumeration value="read" />
      <xs:enumeration value="write" />
      <xs:enumeration value="none" />



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    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="account-name">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="authenticator">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="authentication-type">
    <xs:restriction base="xs:string">
      <!-- To be done -->
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="birthdate">
    <xs:restriction base="xs:date" />
  </xs:simpleType>

  <xs:simpleType name="certificate">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="collection-task-type">
    <xs:restriction base="xs:string">
      <xs:enumeration value="network-observation" />
      <xs:enumeration value="remote-acquisition" />
      <xs:enumeration value="self-reported" />
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="confidence">
    <xs:restriction base="xs:float">
      <xs:minInclusive value="0" />
      <xs:maxInclusive value="1" />
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="content-action">
    <xs:restriction base="xs:string">
      <xs:enumeration value="add" />
      <xs:enumeration value="delete" />
      <xs:enumeration value="update" />
    </xs:restriction>
  </xs:simpleType>




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  <xs:simpleType name="country-code">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="default-depth">
    <xs:restriction base="xs:integer" />
  </xs:simpleType>

  <xs:simpleType name="discoverer">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="firmware-id">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="hardware-serial-number">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="location-name">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="method-label">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="method-repository">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="network-access-level-type">
    <xs:restriction base="xs:string">
      <xs:enumeration value="block" />
      <xs:enumeration value="quarantine" />
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="patch-id">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="patch-name">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <!-- FIXME: is this type appropriate? -->



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  <xs:simpleType name="public-key">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="role-name">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="status">
    <xs:restriction base="xs:string">
      <xs:enumeration value="true" />
      <xs:enumeration value="false" />
      <xs:enumeration value="error" />
      <xs:enumeration value="unknown" />
      <xs:enumeration value="not applicable" />
      <xs:enumeration value="not evaluated" />
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="te-assessment-state">
    <xs:restriction base="xs:string">
      <xs:enumeration value="in-discovery" />
      <xs:enumeration value="discovered" />
      <xs:enumeration value="in-classification" />
      <xs:enumeration value="classified" />
      <xs:enumeration value="in-assessment" />
      <xs:enumeration value="assessed" />
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="timestamp">
    <xs:restriction base="xs:dateTime" />
  </xs:simpleType>

  <xs:simpleType name="web-site">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="port-id">
    <xs:restriction base="xs:string" />
  </xs:simpleType>

  <xs:simpleType name="atm-type">
    <xs:restriction base="xs:string">
      <xs:enumeration value="lowSpeed" />
      <xs:enumeration value="highSpeed" />
    </xs:restriction>
  </xs:simpleType>



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  <xs:simpleType name="enet-type">
    <xs:restriction base="xs:string">
      <xs:enumeration value="enet" />
      <xs:enumeration value="1genet" />
      <xs:enumeration value="10genet" />
      <xs:enumeration value="100genet" />
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="wifi-type">
    <xs:restriction base="xs:string">
      <xs:enumeration value="11n" />
      <xs:enumeration value="11a" />
      <xs:enumeration value="11gb" />
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="virtual-type">
    <xs:restriction base="xs:string">
      <xs:enumeration value="virtual-1g" />
    </xs:restriction>
  </xs:simpleType>

  <xs:complexType name="port">
    <xs:sequence>
      <xs:element name="port-id" type="port-id"/>
      <xs:element name="atm-type" type="atm-type" maxOccurs="1" minOccurs="0" />
      <xs:element name="enet-type" type="enet-type" maxOccurs="1" minOccurs="0" />
      <xs:element name="wifi-type" type="wifi-type" maxOccurs="1" minOccurs="0" />
      <xs:element name="virtual-type" type="virtual-type" maxOccurs="1" minOccurs="0" />
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="user-account">
    <xs:sequence>
      <xs:element name="user" type="user"/>
    </xs:sequence>
  </xs:complexType>
</xs:schema>
<CODE ENDS>

Authors' Addresses









Birkholz & Cam-Winget   Expires January 20, 2018               [Page 27]


Internet-DraYANG subscribed notifications via SACM Statements  July 2017


   Henk Birkholz
   Fraunhofer SIT
   Rheinstrasse 75
   Darmstadt  64295
   Germany

   Email: henk.birkholz@sit.fraunhofer.de


   Nancy Cam-Winget
   Cisco Systems
   3550 Cisco Way
   San Jose, CA  95134
   USA

   Email: ncamwing@cisco.com



































Birkholz & Cam-Winget   Expires January 20, 2018               [Page 28]


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