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Versions: (draft-schoenw-netmod-yang-types) 00 01 02 03 04 05 06 07 08 09 RFC 6021

Network Working Group                              J. Schoenwaelder, Ed.
Internet-Draft                                         Jacobs University
Intended status: Standards Track                        November 3, 2008
Expires: May 7, 2009


                         Common YANG Data Types
                    draft-ietf-netmod-yang-types-01

Status of this Memo

   By submitting this Internet-Draft, each author represents that any
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   This Internet-Draft will expire on May 7, 2009.

Copyright Notice

   Copyright (C) The IETF Trust (2008).














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Abstract

   This document introduces a collection of common data types to be used
   with the YANG data modeling language.


Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Core YANG Derived Types  . . . . . . . . . . . . . . . . . . .  4
   3.  Internet Specific Derived Types  . . . . . . . . . . . . . . . 12
   4.  IEEE Specific Derived Types  . . . . . . . . . . . . . . . . . 21
   5.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 24
   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . 25
   7.  Contributors . . . . . . . . . . . . . . . . . . . . . . . . . 26
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 27
     8.1.  Normative References . . . . . . . . . . . . . . . . . . . 27
     8.2.  Informative References . . . . . . . . . . . . . . . . . . 27
   Appendix A.  XSD Translations  . . . . . . . . . . . . . . . . . . 30
     A.1.  XSD of Core YANG Derived Types . . . . . . . . . . . . . . 30
     A.2.  XSD of Internet Specific Derived Types . . . . . . . . . . 37
     A.3.  XSD of IEEE Specific Derived Types . . . . . . . . . . . . 44
   Appendix B.  RelaxNG Translations  . . . . . . . . . . . . . . . . 47
     B.1.  RelaxNG of Core YANG Derived Types . . . . . . . . . . . . 47
     B.2.  RelaxNG of Internet Specific Derived Types . . . . . . . . 53
     B.3.  RelaxNG of IEEE Specific Derived Types . . . . . . . . . . 58
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 61
   Intellectual Property and Copyright Statements . . . . . . . . . . 62























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1.  Introduction

   YANG [YANG] is a data modeling language used to model configuration
   and state data manipulated by the NETCONF [RFC4741] protocol.  The
   YANG language supports a small set of built-in data types and
   provides mechanisms to derive other types from the built-in types.

   This document introduces a collection of common data types derived
   from the built-in YANG data types.  The definitions are organized in
   several YANG modules.  The "yang-types" module contains generally
   useful data types.  The "inet-types" module contains definitions that
   are relevant for the Internet protocol suite while the "ieee-types"
   module contains definitions that are relevant for IEEE 802 protocols.

   Their derived types are generally designed to be applicable for
   modeling all areas of management information.

   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 BCP
   14, [RFC2119].






























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2.  Core YANG Derived Types

module yang-types {

  namespace "urn:ietf:params:xml:ns:yang:yang-types";
  prefix "yang";

  organization
   "IETF NETMOD (NETCONF Data Modeling Language) Working Group";

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

    WG Chair: David Partain
              <mailto:david.partain@ericsson.com>

    WG Chair: David Harrington
              <mailto:ietfdbh@comcast.net>

    Editor:   Juergen Schoenwaelder
              <mailto:j.schoenwaelder@jacobs-university.de>";

  description
   "This module contains a collection of generally useful derived
    YANG data types.

    Copyright (C) The IETF Trust (2008).  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

  revision 2008-11-03 {
    description
     "Initial revision, published as RFC XXXX.";
  }
  // RFC Ed.: replace XXXX with actual RFC number and remove this note

  /*** collection of counter and gauge types ***/

  typedef counter32 {
    type uint32;
    description
     "The counter32 type represents a non-negative integer
      which monotonically increases until it reaches a
      maximum value of 2^32-1 (4294967295 decimal), when it
      wraps around and starts increasing again from zero.




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      Counters have no defined `initial' value, and thus, a
      single value of a counter has (in general) no information
      content.  Discontinuities in the monotonically increasing
      value normally occur at re-initialization of the
      management system, and at other times as specified in the
      description of an object instance using this type.  If
      such other times can occur, for example, the creation of
      an object instance of type counter32 at times other than
      re-initialization, then a corresponding object should be
      defined, with an appropriate type, to indicate the last
      discontinuity.

      The counter32 type should not be used for configuration
      objects. A default statement should not be used for
      attributes with a type value of counter32.

      This type is in the value set and its semantics equivalent
      to the Counter32 type of the SMIv2.";
    reference
     "RFC 2578: Structure of Management Information Version 2 (SMIv2)";
  }

  typedef zero-based-counter32 {
    type yang:counter32;
    default "0";
    description
     "The zero-based-counter32 type represents a counter32
      which has the defined `initial' value zero.

      Objects of this type will be set to zero(0) on creation
      and will thereafter count appropriate events, wrapping
      back to zero(0) when the value 2^32 is reached.

      Provided that an application discovers the new object within
      the minimum time to wrap it can use the initial value as a
      delta since it last polled the table of which this object is
      part.  It is important for a management station to be aware
      of this minimum time and the actual time between polls, and
      to discard data if the actual time is too long or there is
      no defined minimum time.

      This type is in the value set and its semantics equivalent
      to the ZeroBasedCounter32 textual convention of the SMIv2.";
    reference
      "RFC 2021: Remote Network Monitoring Management Information
                 Base Version 2 using SMIv2";
  }




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  typedef counter64 {
    type uint64;
    description
     "The counter64 type represents a non-negative integer
      which monotonically increases until it reaches a
      maximum value of 2^64-1 (18446744073709551615), when
      it wraps around and starts increasing again from zero.

      Counters have no defined `initial' value, and thus, a
      single value of a counter has (in general) no information
      content.  Discontinuities in the monotonically increasing
      value normally occur at re-initialization of the
      management system, and at other times as specified in the
      description of an object instance using this type.  If
      such other times can occur, for example, the creation of
      an object instance of type counter64 at times other than
      re-initialization, then a corresponding object should be
      defined, with an appropriate type, to indicate the last
      discontinuity.

      The counter64 type should not be used for configuration
      objects. A default statement should not be used for
      attributes with a type value of counter64.

      This type is in the value set and its semantics equivalent
      to the Counter64 type of the SMIv2.";
    reference
     "RFC 2578: Structure of Management Information Version 2 (SMIv2)";
  }

  typedef zero-based-counter64 {
    type yang:counter64;
    default "0";
    description
     "The zero-based-counter64 type represents a counter64 which
      has the defined `initial' value zero.

      Objects of this type will be set to zero(0) on creation
      and will thereafter count appropriate events, wrapping
      back to zero(0) when the value 2^64 is reached.

      Provided that an application discovers the new object within
      the minimum time to wrap it can use the initial value as a
      delta since it last polled the table of which this object is
      part.  It is important for a management station to be aware
      of this minimum time and the actual time between polls, and
      to discard data if the actual time is too long or there is
      no defined minimum time.



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      This type is in the value set and its semantics equivalent
      to the ZeroBasedCounter64 textual convention of the SMIv2.";
    reference
     "RFC 2856: Textual Conventions for Additional High Capacity
                Data Types";
  }

  typedef gauge32 {
    type uint32;
    description
     "The gauge32 type represents a non-negative integer, which
      may increase or decrease, but shall never exceed a maximum
      value, nor fall below a minimum value.  The maximum value
      can not be greater than 2^32-1 (4294967295 decimal), and
      the minimum value can not be smaller than 0.  The value of
      a gauge32 has its maximum value whenever the information
      being modeled is greater than or equal to its maximum
      value, and has its minimum value whenever the information
      being modeled is smaller than or equal to its minimum value.
      If the information being modeled subsequently decreases
      below (increases above) the maximum (minimum) value, the
      gauge32 also decreases (increases).

      This type is in the value set and its semantics equivalent
      to the Counter32 type of the SMIv2.";
    reference
     "RFC 2578: Structure of Management Information Version 2 (SMIv2)";
  }

  typedef gauge64 {
    type uint64;
    description
     "The gauge64 type represents a non-negative integer, which
      may increase or decrease, but shall never exceed a maximum
      value, nor fall below a minimum value.  The maximum value
      can not be greater than 2^64-1 (18446744073709551615), and
      the minimum value can not be smaller than 0.  The value of
      a gauge64 has its maximum value whenever the information
      being modeled is greater than or equal to its maximum
      value, and has its minimum value whenever the information
      being modeled is smaller than or equal to its minimum value.
      If the information being modeled subsequently decreases
      below (increases above) the maximum (minimum) value, the
      gauge64 also decreases (increases).

      This type is in the value set and its semantics equivalent
      to the CounterBasedGauge64 SMIv2 textual convention defined
      in RFC 2856";



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    reference
     "RFC 2856: Textual Conventions for Additional High Capacity
                Data Types";
  }

  /*** collection of identifier related types ***/

  typedef object-identifier {
    type string {
      pattern '(([0-1](\.[1-3]?[0-9]))|(2\.(0|([1-9]\d*))))'
            + '(\.(0|([1-9]\d*)))*';
    }
    description
     "The object-identifier type represents administratively
      assigned names in a registration-hierarchical-name tree.

      Values of this type are denoted as a sequence of numerical
      non-negative sub-identifier values. Each sub-identifier
      value MUST NOT exceed 2^32-1 (4294967295). Sub-identifiers
      are separated by single dots and without any intermediate
      white space.

      Although the number of sub-identifiers is not limited,
      module designers should realize that there may be
      implementations that stick with the SMIv2 limit of 128
      sub-identifiers.

      This type is a superset of the SMIv2 OBJECT IDENTIFIER type
      since it is not restricted to 128 sub-identifiers.";
    reference
     "ISO/IEC 9834-1: Information technology -- Open Systems
      Interconnection -- Procedures for the operation of OSI
      Registration Authorities: General procedures and top
      arcs of the ASN.1 Object Identifier tree";
  }

  typedef object-identifier-128 {
    type object-identifier {
      pattern '\d*(.\d){1,127}';
    }
    description
     "This type represents object-identifiers restricted to 128
      sub-identifiers.

      This type is in the value set and its semantics equivalent to
      the OBJECT IDENTIFIER type of the SMIv2.";
    reference
     "RFC 2578: Structure of Management Information Version 2 (SMIv2)";



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  }

  /*** collection of date and time related types ***/

  typedef date-and-time {
    type string {
      pattern '\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}(\.\d+)?'
            + '(Z|(\+|-)\d{2}:\d{2})';
    }
    description
     'The date-and-time type is a profile of the ISO 8601
      standard for representation of dates and times using the
      Gregorian calendar. The format is most easily described
      using the following ABFN (see RFC 3339):

      date-fullyear   = 4DIGIT
      date-month      = 2DIGIT  ; 01-12
      date-mday       = 2DIGIT  ; 01-28, 01-29, 01-30, 01-31
      time-hour       = 2DIGIT  ; 00-23
      time-minute     = 2DIGIT  ; 00-59
      time-second     = 2DIGIT  ; 00-58, 00-59, 00-60
      time-secfrac    = "." 1*DIGIT
      time-numoffset  = ("+" / "-") time-hour ":" time-minute
      time-offset     = "Z" / time-numoffset

      partial-time    = time-hour ":" time-minute ":" time-second
                        [time-secfrac]
      full-date       = date-fullyear "-" date-month "-" date-mday
      full-time       = partial-time time-offset

      date-time       = full-date "T" full-time

      The date-and-time type is compatible with the dateTime XML
      schema type except that dateTime allows negative years
      which are not allowed by RFC 3339.

      This type is not equivalent to the DateAndTime textual
      convention of the SMIv2 since RFC 3339 uses a different
      separator between full-date and full-time and provides
      higher resolution of time-secfrac.';

      // [TODO] This type may require normalization rules since Z and
      // +00:00 mean the same - but note that -00:00 does not according
      // to RFC 3339 section 4.3 but it does according to XSD.
      // In addition, it is possible to write the same data and time
      // value using different time zones. XSD says the canonical format
      // is UTC using the Z format.




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    reference
     "RFC 3339: Date and Time on the Internet: Timestamps
      RFC 2579: Textual Conventions for SMIv2";
  }

  typedef timeticks {
    type uint32;
    description
     "The timeticks type represents a non-negative integer which
      represents the time, modulo 2^32 (4294967296 decimal), in
      hundredths of a second between two epochs. When objects
      are defined which use this type, the description of the
      object identifies both of the reference epochs.

      This type is in the value set and its semantics equivalent to
      the TimeStamp textual convention of the SMIv2.";
    reference
     "RFC 2579: Textual Conventions for SMIv2";
  }

  typedef timestamp {
    type yang:timeticks;
    description
     "The timestamp type represents the value of an associated
      timeticks object at which a specific occurrence happened.
      The specific occurrence must be defined in the description
      of any object defined using this type.  When the specific
      occurrence occurred prior to the last time the associated
      timeticks attribute was zero, then the timestamp value is
      zero.  Note that this requires all timestamp values to be
      reset to zero when the value of the associated timeticks
      attribute reaches 497+ days and wraps around to zero.

      The associated timeticks object must be specified
      in the description of any object using this type.

      This type is in the value set and its semantics equivalent to
      the TimeStamp textual convention of the SMIv2.";
    reference
     "RFC 2579: Textual Conventions for SMIv2";
  }

  /*** collection of generic address types ***/

  typedef phys-address {
    type string {
      pattern '([0-9a0-fA-F]{2}(:[0-9a0-fA-F]{2})*)?';
    }



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    description
     "Represents media- or physical-level addresses represented
      as a sequence octets, each octet represented by two hexadecimal
      numbers. Octets are separated by colons.

      This type is in the value set and its semantics equivalent to
      the PhysAddress textual convention of the SMIv2.";
    reference
     "RFC 2579: Textual Conventions for SMIv2";
  }

}







































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3.  Internet Specific Derived Types

 module inet-types {

   namespace "urn:ietf:params:xml:ns:yang:inet-types";
   prefix "inet";

   organization
    "IETF NETMOD (NETCONF Data Modeling Language) Working Group";

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

     WG Chair: David Partain
               <mailto:david.partain@ericsson.com>

     WG Chair: David Harrington
               <mailto:ietfdbh@comcast.net>

     Editor:   Juergen Schoenwaelder
               <mailto:j.schoenwaelder@jacobs-university.de>";

   description
    "This module contains a collection of generally useful derived
     YANG data types for Internet addresses and related things.

     Copyright (C) The IETF Trust (2008).  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

   revision 2008-11-03 {
     description
      "Initial revision, published as RFC XXXX.";
   }
   // RFC Ed.: replace XXXX with actual RFC number and remove this note

   /*** collection of protocol field related types ***/

   typedef ip-version {
     type enumeration {
       enum unknown {
         value "0";
         description
          "An unknown or unspecified version of the Internet protocol.";
       }
       enum ipv4 {



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         value "1";
         description
          "The IPv4 protocol as defined in RFC 791.";
       }
       enum ipv6 {
         value "2";
         description
          "The IPv6 protocol as defined in RFC 2460.";
       }
     }
     description
      "This value represents the version of the IP protocol.

       This type is in the value set and its semantics equivalent
       to the InetVersion textual convention of the SMIv2. However,
       the lexical appearance is different from the InetVersion
       textual convention.";
     reference
      "RFC  791: Internet Protocol
       RFC 2460: Internet Protocol, Version 6 (IPv6) Specification
       RFC 4001: Textual Conventions for Internet Network Addresses";
   }

   typedef dscp {
     type uint8 {
       range "0..63";
     }
     description
      "The dscp type represents a Differentiated Services Code-Point
       that may be used for marking packets in a traffic stream.

       This type is in the value set and its semantics equivalent
       to the Dscp textual convention of the SMIv2.";
     reference
      "RFC 3289: Management Information Base for the Differentiated
                 Services Architecture
       RFC 2474: Definition of the Differentiated Services Field
                 (DS Field) in the IPv4 and IPv6 Headers
       RFC 2780: IANA Allocation Guidelines For Values In
                 the Internet Protocol and Related Headers";
   }

   typedef flow-label {
     type uint32 {
       range "0..1048575";
     }
     description
      "The flow-label type represents flow identifier or Flow Label



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       in an IPv6 packet header that may be used to discriminate
       traffic flows.

       This type is in the value set and its semantics equivalent
       to the IPv6FlowLabel textual convention of the SMIv2.";
     reference
      "RFC 3595: Textual Conventions for IPv6 Flow Label
       RFC 2460: Internet Protocol, Version 6 (IPv6) Specification";
   }

   typedef port-number {
     type uint16 {
       range "1..65535";
     }
     description
      "The port-number type represents a 16-bit port number of an
       Internet transport layer protocol such as UDP, TCP, DCCP or
       SCTP. Port numbers are assigned by IANA.  A current list of
       all assignments is available from <http://www.iana.org/>.

       Note that the value zero is not a valid port number. A union
       type might be used in situations where the value zero is
       meaningful.

       This type is in the value set and its semantics equivalent
       to the InetPortNumber textual convention of the SMIv2.";
     reference
      "RFC  768: User Datagram Protocol
       RFC  793: Transmission Control Protocol
       RFC 2960: Stream Control Transmission Protocol
       RFC 4340: Datagram Congestion Control Protocol (DCCP)
       RFC 4001: Textual Conventions for Internet Network Addresses";
   }

   /*** collection of autonomous system related types ***/

   typedef autonomous-system-number {
     type uint32;
     description
       "The as-number type represents autonomous system numbers
        which identify an Autonomous System (AS). An AS is a set
        of routers under a single technical administration, using
        an interior gateway protocol and common metrics to route
        packets within the AS, and using an exterior gateway
        protocol to route packets to other ASs'. IANA maintains
        the AS number space and has delegated large parts to the
        regional registries.




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        Autonomous system numbers are currently limited to 16 bits
        (0..65535). There is however work in progress to enlarge
        the autonomous system number space to 32 bits. This
        textual convention therefore uses an uint32 base type
        without a range restriction in order to support a larger
        autonomous system number space.

        This type is in the value set and its semantics equivalent
        to the InetAutonomousSystemNumber textual convention of
        the SMIv2.";
     reference
      "RFC 1930: Guidelines for creation, selection, and registration
                 of an Autonomous System (AS)
       RFC 4271: A Border Gateway Protocol 4 (BGP-4)
       RFC 4001: Textual Conventions for Internet Network Addresses";
   }

   /*** collection of IP address and hostname related types ***/

   typedef ip-address {
     type union {
       type inet:ipv4-address;
       type inet:ipv6-address;
     }
     description
      "The ip-address type represents an IP address and is IP
       version neutral. The format of the textual representations
       implies the IP version.";
   }

   typedef ipv4-address {
     type string {
       pattern '((0'
             +   '|(1[0-9]{0,2})'
             +   '|(2(([0-4][0-9]?)|(5[0-5]?)|([6-9]?)))'
             +   '|([3-9][0-9]?)'
             +  ')'
             + '\.){3}'
             + '(0'
             +  '|(1[0-9]{0,2})'
             +  '|(2(([0-4][0-9]?)|(5[0-5]?)|([6-9]?)))'
             +  '|([3-9][0-9]?)'
             + ')(%[\p{N}\p{L}]+)?';
     }
     description
       "The ipv4-address type represents an IPv4 address in
        dotted-quad notation. The IPv4 address may include a zone
        index, separated by a % sign.



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        The zone index is used to disambiguate identical address
        values.  For link-local addresses, the zone index will
        typically be the interface index number or the name of an
        interface. If the zone index is not present, the default
        zone of the device will be used.";

        // [TODO] There is an normalization issue with regard to
        // systems that allow numeric and textual zone indexes.
   }

   typedef ipv6-address {
     type string {
       pattern
        /* full */
        '((([0-9a-fA-F]{1,4}:){7})([0-9a-fA-F]{1,4})'
     +   '(%[\p{N}\p{L}]+)?)'
        /* mixed */
     +  '|((([0-9a-fA-F]{1,4}:){6})(([0-9]{1,3}\.'
     +      '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}))'
     +    '(%[\p{N}\p{L}]+)?)'
        /* shortened */
     +  '|((([0-9a-fA-F]{1,4}:)*([0-9a-fA-F]{1,4}))*(::)'
     +    '(([0-9a-fA-F]{1,4}:)*([0-9a-fA-F]{1,4}))*'
     +    '(%[\p{N}\p{L}]+)?)'
        /* shortened mixed */
     + '|((([0-9a-fA-F]{1,4}:)*([0-9a-fA-F]{1,4}))*(::)'
     +   '(([0-9a-fA-F]{1,4}:)*([0-9a-fA-F]{1,4}))*'
     +   '(([0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}))'
     +    '(%[\p{N}\p{L}]+)?)';
     }
     description
      "The ipv6-address type represents an IPv6 address in full,
       mixed, shortened and shortened mixed notation.  The IPv6
       address may include a zone index, separated by a % sign.

       The zone index is used to disambiguate identical address
       values.  For link-local addresses, the zone index will
       typically be the interface index number or the name of an
       interface. If the zone index is not present, the default
       zone of the device will be used.";

       // [TODO] Normalization needed due to the shortened and
       // mixed forms and the zone index?

     reference
      "RFC 4007: IPv6 Scoped Address Architecture";
   }




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   // [TODO] The pattern needs to be checked; once YANG supports
   // multiple pattern, we can perhaps be more precise.

   typedef ip-prefix {
     type union {
       type inet:ipv4-prefix;
       type inet:ipv6-prefix;
     }
     description
      "The ip-prefix type represents an IP prefix and is IP
       version neutral. The format of the textual representations
       implies the IP version.";
   }

   typedef ipv4-prefix {
     type string {
       pattern '(([0-1]?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])\.){3}'
             + '([0-1]?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])'
             + '/\d+';
     }
     description
      "The ipv4-prefix type represents an IPv4 address prefix.
       The prefix length is given by the number following the
       slash character and must be less than or equal to 32.

       A prefix length value of n corresponds to an IP address
       mask which has n contiguous 1-bits from the most
       significant bit (MSB) and all other bits set to 0.

       The IPv4 address represented in dotted quad notation
       should have all bits that do not belong to the prefix
       set to zero.";

       // [TODO] Normalization needed since bits of the prefix
       // can be set arbitrarily.
   }

   typedef ipv6-prefix {
     type string {
       pattern
        /* full */
        '((([0-9a-fA-F]{1,4}:){7})([0-9a-fA-F]{1,4})'
      +  '/\d+)'
        /* mixed */
      +  '|((([0-9a-fA-F]{1,4}:){6})(([0-9]{1,3}\.'
      +      '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}))'
      +   '/\d+)'
        /* shortened */



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      +  '|((([0-9a-fA-F]{1,4}:)*([0-9a-fA-F]{1,4}))*(::)'
      +   '(([0-9a-fA-F]{1,4}:)*([0-9a-fA-F]{1,4}))*'
      +   '/\d+)'
        /* shortened mixed */
      + '|((([0-9a-fA-F]{1,4}:)*([0-9a-fA-F]{1,4}))*(::)'
      +   '(([0-9a-fA-F]{1,4}:)*([0-9a-fA-F]{1,4}))*'
      +   '(([0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}))'
      +    '/\d+)';
     }
     description
      "The ipv6-prefix type represents an IPv6 address prefix.
       The prefix length is given by the number following the
       slash character and must be less than or equal 128.

       A prefix length value of n corresponds to an IP address
       mask which has n contiguous 1-bits from the most
       significant bit (MSB) and all other bits set to 0.

       The IPv6 address should have all bits that do not belong
       to the prefix set to zero.";

       // [TODO] Normalization needed due to the shortened and
       // mixed forms and since bits of the prefix can be set
       // arbitrarily.
   }

   // [TODO] The pattern needs to be checked; once YANG supports
   // multiple pattern, we can perhaps be more precise.]

   /*** collection of domain name and URI types ***/

   typedef domain-name {
     type string {
       pattern '([a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9]\.)*'
            +  '[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9]';
     }
     description
      "The domain-name type represents a DNS domain name. The
       name SHOULD be fully qualified whenever possible.

       The description clause of objects using the domain-name
       type MUST describe how (and when) these names are
       resolved to IP addresses.

       Note that the resolution of a domain-name value may
       require to query multiple DNS records (e.g., A for IPv4
       and AAAA for IPv6). The order of the resolution process
       and which DNS record takes precedence depends on the



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       configuration of the resolver.";

       // [TODO] Normalization needed since names are case
       // insensitive (normalize to lowercase characters).]

     reference
      "RFC 1034: Domain Names - Concepts and Facilities
       RFC 1123: Requirements for Internet Hosts -- Application
                 and Support";
   }

   // [TODO] RFC 2181 says there are no restrictions on DNS
   // labels. Need to check whether the pattern is too
   // restrictive.

   typedef host {
     type union {
       type inet:ip-address;
       type inet:domain-name;
     }
     description
      "The host type represents either an IP address or a DNS
       domain name.";
   }

   typedef uri {
     type string;    // [TODO] add the regex from RFC 3986 here?
     description
      "The uri type represents a Uniform Resource Identifier
       (URI) as defined by STD 66.

       Objects using the uri type must be in US-ASCII encoding,
       and MUST be normalized as described by RFC 3986 Sections
       6.2.1, 6.2.2.1, and 6.2.2.2.  All unnecessary
       percent-encoding is removed, and all case-insensitive
       characters are set to lowercase except for hexadecimal
       digits, which are normalized to uppercase as described in
       Section 6.2.2.1.

       The purpose of this normalization is to help provide
       unique URIs.  Note that this normalization is not
       sufficient to provide uniqueness.  Two URIs that are
       textually distinct after this normalization may still be
       equivalent.

       Objects using the uri type may restrict the schemes that
       they permit.  For example, 'data:' and 'urn:' schemes
       might not be appropriate.



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       A zero-length URI is not a valid URI.  This can be used to
       express 'URI absent' where required

       This type is in the value set and its semantics equivalent
       to the Uri textual convention of the SMIv2.";
     reference
      "RFC 3986: Uniform Resource Identifier (URI): Generic Syntax
       RFC 3305: Report from the Joint W3C/IETF URI Planning Interest
                 Group: Uniform Resource Identifiers (URIs), URLs,
                 and Uniform Resource Names (URNs): Clarifications
                 and Recommendations
       RFC 5017: MIB Textual Conventions for Uniform Resource
                 Identifiers (URIs)";
   }

 }



































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4.  IEEE Specific Derived Types

  module ieee-types {

    namespace "urn:ietf:params:xml:ns:yang:ieee-types";
    prefix "ieee";

    import yang-types { prefix yang; }

    organization
     "IETF NETMOD (NETCONF Data Modeling Language) Working Group";

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

      WG Chair: David Partain
                <mailto:david.partain@ericsson.com>

      WG Chair: David Harrington
                <mailto:ietfdbh@comcast.net>

      Editor:   Juergen Schoenwaelder
                <mailto:j.schoenwaelder@jacobs-university.de>";

    description
     "This module contains a collection of generally useful derived
      YANG data types for IEEE 802 addresses and related things.

      Copyright (C) The IETF Trust (2008).  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

    revision 2008-11-03 {
      description
       "Initial revision, published as RFC XXXX";
    }
    // RFC Ed.: replace XXXX with actual RFC number and remove this note

    /*** collection of IEEE address type definitions ***/

    typedef mac-address {
      type string {
        pattern '[0-9a-fA-F]{2}(:[0-9a-fA-F]{2}){5}';
      }
      description
       "The mac-address type represents an 802 MAC address represented



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        in the `canonical' order defined by IEEE 802.1a, i.e., as if it
        were transmitted least significant bit first, even though 802.5
        (in contrast to other 802.x protocols) requires MAC addresses
        to be transmitted most significant bit first.

        This type is in the value set and its semantics equivalent to
        the MacAddress textual convention of the SMIv2.";
      reference
        "RFC 2579: Textual Conventions for SMIv2";
    }

    /*** collection of IEEE 802 related identifier types ***/

    typedef bridgeid {
      type string {
        pattern '[0-9a-fA-F]{4}(:[0-9a-fA-F]{2}){6}';
      }
      description
       "The bridgeid type represents identifiers that uniquely
        identify a bridge.  Its first four hexadecimal digits
        contain a priority value followed by a colon. The
        remaining characters contain the MAC address used to
        refer to a bridge in a unique fashion (typically, the
        numerically smallest MAC address of all ports on the
        bridge).

        This type is in the value set and its semantics equivalent
        to the BridgeId textual convention of the SMIv2. However,
        since the BridgeId textual convention does not prescribe
        a lexical representation, the appearance might be different.";
      reference
       "RFC 4188: Definitions of Managed Objects for Bridges";
    }

    typedef vlanid {
      type uint16 {
        range "1..4094";
      }
      description
       "The vlanid type uniquely identifies a VLAN. This is the
        12-bit VLAN-ID used in the VLAN Tag header. The range is
        defined by the referenced specification.

        This type is in the value set and its semantics equivalent to
        the VlanId textual convention of the SMIv2.";
      reference
       "IEEE Std 802.1Q 2003 Edition: Virtual Bridged Local
                  Area Networks



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        RFC 4363: Definitions of Managed Objects for Bridges with
                  Traffic Classes, Multicast Filtering, and Virtual
                  LAN Extensions";
    }

  }













































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5.  IANA Considerations

   A registry for standard YANG modules shall be set up.  The name of
   the registry is "IETF YANG Modules" and the registry shall record for
   each entry the unique name of a YANG module, the assigned XML
   namespace from the YANG URI Scheme, and a reference to the module's
   documentation (typically and RFC).  Allocations require IETF Review
   as defined in [RFC5226].  The initial assignements are:

     YANG Module   XML namespace                           Reference
     -----------   --------------------------------------  ---------
     yang-types    urn:ietf:params:xml:ns:yang:yang-types  RFC XXXX
     inet-types    urn:ietf:params:xml:ns:yang:inet-types  RFC XXXX
     ieee-types    urn:ietf:params:xml:ns:yang:ieee-types  RFC XXXX

   RFC Ed.: replace XXXX with actual RFC number and remove this note

   This document registers three URIs1 in the IETF XML registry
   [RFC3688].  Following the format in RFC 3688, the following
   registration is requested.

     URI: urn:ietf:params:xml:ns:yang:yang-types
     URI: urn:ietf:params:xml:ns:yang:inet-types
     URI: urn:ietf:params:xml:ns:yang:ieee-types

     Registrant Contact: The NETMOD WG of the IETF.

     XML: N/A, the requested URI is an XML namespace.























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6.  Security Considerations

   This document defines common data types using the YANG data modeling
   language.  The definitions themselves have no security impact on the
   Internet but the usage of these definitions in concrete YANG modules
   might have.  The security considerations spelled out in the YANG
   specification [YANG] apply for this document as well.












































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7.  Contributors

   The following people all contributed significantly to the initial
   version of this draft:

    - Andy Bierman (andybierman.com)
    - Martin Bjorklund (Tail-f Systems)
    - Balazs Lengyel (Ericsson)
    - David Partain (Ericsson)
    - Phil Shafer (Juniper Networks)









































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8.  References

8.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC3688]  Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
              January 2004.

   [RFC5226]  Narten, T. and H. Alvestrand, "Guidelines for Writing an
              IANA Considerations Section in RFCs", BCP 26, RFC 5226,
              May 2008.

   [YANG]     Bjorklund, M., Ed., "YANG - A data modeling language for
              NETCONF", draft-ietf-netmod-yang-01 (work in progress).

8.2.  Informative References

   [802.1Q]   ANSI/IEEE Standard 802.1Q, "IEEE Standards for Local and
              Metropolitan Area Networks: Virtual Bridged Local Area
              Networks", 2003.

   [RFC0768]  Postel, J., "User Datagram Protocol", STD 6, RFC 768,
              August 1980.

   [RFC0791]  Postel, J., "Internet Protocol", STD 5, RFC 791,
              September 1981.

   [RFC0793]  Postel, J., "Transmission Control Protocol", STD 7,
              RFC 793, September 1981.

   [RFC1034]  Mockapetris, P., "Domain names - concepts and facilities",
              STD 13, RFC 1034, November 1987.

   [RFC1123]  Braden, R., "Requirements for Internet Hosts - Application
              and Support", STD 3, RFC 1123, October 1989.

   [RFC1930]  Hawkinson, J. and T. Bates, "Guidelines for creation,
              selection, and registration of an Autonomous System (AS)",
              BCP 6, RFC 1930, March 1996.

   [RFC2021]  Waldbusser, S., "Remote Network Monitoring Management
              Information Base Version 2 using SMIv2", RFC 2021,
              January 1997.

   [RFC2460]  Deering, S. and R. Hinden, "Internet Protocol, Version 6
              (IPv6) Specification", RFC 2460, December 1998.



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   [RFC2474]  Nichols, K., Blake, S., Baker, F., and D. Black,
              "Definition of the Differentiated Services Field (DS
              Field) in the IPv4 and IPv6 Headers", RFC 2474,
              December 1998.

   [RFC2578]  McCloghrie, K., Ed., Perkins, D., Ed., and J.
              Schoenwaelder, Ed., "Structure of Management Information
              Version 2 (SMIv2)", STD 58, RFC 2578, April 1999.

   [RFC2579]  McCloghrie, K., Ed., Perkins, D., Ed., and J.
              Schoenwaelder, Ed., "Textual Conventions for SMIv2",
              STD 58, RFC 2579, April 1999.

   [RFC2780]  Bradner, S. and V. Paxson, "IANA Allocation Guidelines For
              Values In the Internet Protocol and Related Headers",
              BCP 37, RFC 2780, March 2000.

   [RFC2856]  Bierman, A., McCloghrie, K., and R. Presuhn, "Textual
              Conventions for Additional High Capacity Data Types",
              RFC 2856, June 2000.

   [RFC2960]  Stewart, R., Xie, Q., Morneault, K., Sharp, C.,
              Schwarzbauer, H., Taylor, T., Rytina, I., Kalla, M.,
              Zhang, L., and V. Paxson, "Stream Control Transmission
              Protocol", RFC 2960, October 2000.

   [RFC3289]  Baker, F., Chan, K., and A. Smith, "Management Information
              Base for the Differentiated Services Architecture",
              RFC 3289, May 2002.

   [RFC3305]  Mealling, M. and R. Denenberg, "Report from the Joint W3C/
              IETF URI Planning Interest Group: Uniform Resource
              Identifiers (URIs), URLs, and Uniform Resource Names
              (URNs): Clarifications and Recommendations", RFC 3305,
              August 2002.

   [RFC3339]  Klyne, G., Ed. and C. Newman, "Date and Time on the
              Internet: Timestamps", RFC 3339, July 2002.

   [RFC3595]  Wijnen, B., "Textual Conventions for IPv6 Flow Label",
              RFC 3595, September 2003.

   [RFC3986]  Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
              Resource Identifier (URI): Generic Syntax", STD 66,
              RFC 3986, January 2005.

   [RFC4001]  Daniele, M., Haberman, B., Routhier, S., and J.
              Schoenwaelder, "Textual Conventions for Internet Network



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              Addresses", RFC 4001, February 2005.

   [RFC4007]  Deering, S., Haberman, B., Jinmei, T., Nordmark, E., and
              B. Zill, "IPv6 Scoped Address Architecture", RFC 4007,
              March 2005.

   [RFC4188]  Norseth, K. and E. Bell, "Definitions of Managed Objects
              for Bridges", RFC 4188, September 2005.

   [RFC4271]  Rekhter, Y., Li, T., and S. Hares, "A Border Gateway
              Protocol 4 (BGP-4)", RFC 4271, January 2006.

   [RFC4340]  Kohler, E., Handley, M., and S. Floyd, "Datagram
              Congestion Control Protocol (DCCP)", RFC 4340, March 2006.

   [RFC4741]  Enns, R., "NETCONF Configuration Protocol", RFC 4741,
              December 2006.

   [RFC5017]  McWalter, D., "MIB Textual Conventions for Uniform
              Resource Identifiers (URIs)", RFC 5017, September 2007.































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Appendix A.  XSD Translations

   This appendix provides XML Schema (XSD) translations of the types
   defined in this document.  This appendix is informative and not
   normative.

A.1.  XSD of Core YANG Derived Types

 <?xml version="1.0" encoding="UTF-8"?>
 <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
            targetNamespace="urn:ietf:params:xml:ns:yang:yang-types"
            xmlns="urn:ietf:params:xml:ns:yang:yang-types"
            xmlns:yang="urn:ietf:params:xml:ns:yang:yang-types"
            elementFormDefault="qualified"
            attributeFormDefault="unqualified"
            version="2008-11-03"
            xml:lang="en">

   <xs:annotation>
     <xs:documentation>
       This module contains a collection of generally useful derived
       YANG data types.

       Copyright (C) The IETF Trust (2008).  This version of this
       YANG module is part of RFC XXXX; see the RFC itself for full
       legal notices.
     </xs:documentation>
   </xs:annotation>

   <!-- YANG typedefs -->

   <xs:simpleType name="counter32">
     <xs:annotation>
       <xs:documentation>
         The counter32 type represents a non-negative integer
         which monotonically increases until it reaches a
         maximum value of 2^32-1 (4294967295 decimal), when it
         wraps around and starts increasing again from zero.

         Counters have no defined `initial' value, and thus, a
         single value of a counter has (in general) no information
         content.  Discontinuities in the monotonically increasing
         value normally occur at re-initialization of the
         management system, and at other times as specified in the
         description of an object instance using this type.  If
         such other times can occur, for example, the creation of
         an object instance of type counter32 at times other than
         re-initialization, then a corresponding object should be



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         defined, with an appropriate type, to indicate the last
         discontinuity.

         The counter32 type should not be used for configuration
         objects. A default statement should not be used for
         attributes with a type value of counter32.

         This type is in the value set and its semantics equivalent
         to the Counter32 type of the SMIv2.
       </xs:documentation>
     </xs:annotation>

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

   <xs:simpleType name="zero-based-counter32">
     <xs:annotation>
       <xs:documentation>
         The zero-based-counter32 type represents a counter32
         which has the defined `initial' value zero.

         Objects of this type will be set to zero(0) on creation
         and will thereafter count appropriate events, wrapping
         back to zero(0) when the value 2^32 is reached.

         Provided that an application discovers the new object within
         the minimum time to wrap it can use the initial value as a
         delta since it last polled the table of which this object is
         part.  It is important for a management station to be aware
         of this minimum time and the actual time between polls, and
         to discard data if the actual time is too long or there is
         no defined minimum time.

         This type is in the value set and its semantics equivalent
         to the ZeroBasedCounter32 textual convention of the SMIv2.
       </xs:documentation>
     </xs:annotation>

     <xs:restriction base="yang:counter32">
     </xs:restriction>
   </xs:simpleType>

   <xs:simpleType name="counter64">
     <xs:annotation>
       <xs:documentation>
         The counter64 type represents a non-negative integer
         which monotonically increases until it reaches a



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         maximum value of 2^64-1 (18446744073709551615), when
         it wraps around and starts increasing again from zero.

         Counters have no defined `initial' value, and thus, a
         single value of a counter has (in general) no information
         content.  Discontinuities in the monotonically increasing
         value normally occur at re-initialization of the
         management system, and at other times as specified in the
         description of an object instance using this type.  If
         such other times can occur, for example, the creation of
         an object instance of type counter64 at times other than
         re-initialization, then a corresponding object should be
         defined, with an appropriate type, to indicate the last
         discontinuity.

         The counter64 type should not be used for configuration
         objects. A default statement should not be used for
         attributes with a type value of counter64.

         This type is in the value set and its semantics equivalent
         to the Counter64 type of the SMIv2.
       </xs:documentation>
     </xs:annotation>

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

   <xs:simpleType name="zero-based-counter64">
     <xs:annotation>
       <xs:documentation>
         The zero-based-counter64 type represents a counter64 which
         has the defined `initial' value zero.

         Objects of this type will be set to zero(0) on creation
         and will thereafter count appropriate events, wrapping
         back to zero(0) when the value 2^64 is reached.

         Provided that an application discovers the new object within
         the minimum time to wrap it can use the initial value as a
         delta since it last polled the table of which this object is
         part.  It is important for a management station to be aware
         of this minimum time and the actual time between polls, and
         to discard data if the actual time is too long or there is
         no defined minimum time.

         This type is in the value set and its semantics equivalent
         to the ZeroBasedCounter64 textual convention of the SMIv2.



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       </xs:documentation>
     </xs:annotation>

     <xs:restriction base="yang:counter64">
     </xs:restriction>
   </xs:simpleType>

   <xs:simpleType name="gauge32">
     <xs:annotation>
       <xs:documentation>
         The gauge32 type represents a non-negative integer, which
         may increase or decrease, but shall never exceed a maximum
         value, nor fall below a minimum value.  The maximum value
         can not be greater than 2^32-1 (4294967295 decimal), and
         the minimum value can not be smaller than 0.  The value of
         a gauge32 has its maximum value whenever the information
         being modeled is greater than or equal to its maximum
         value, and has its minimum value whenever the information
         being modeled is smaller than or equal to its minimum value.
         If the information being modeled subsequently decreases
         below (increases above) the maximum (minimum) value, the
         gauge32 also decreases (increases).

         This type is in the value set and its semantics equivalent
         to the Counter32 type of the SMIv2.
       </xs:documentation>
     </xs:annotation>

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

   <xs:simpleType name="gauge64">
     <xs:annotation>
       <xs:documentation>
         The gauge64 type represents a non-negative integer, which
         may increase or decrease, but shall never exceed a maximum
         value, nor fall below a minimum value.  The maximum value
         can not be greater than 2^64-1 (18446744073709551615), and
         the minimum value can not be smaller than 0.  The value of
         a gauge64 has its maximum value whenever the information
         being modeled is greater than or equal to its maximum
         value, and has its minimum value whenever the information
         being modeled is smaller than or equal to its minimum value.
         If the information being modeled subsequently decreases
         below (increases above) the maximum (minimum) value, the
         gauge64 also decreases (increases).




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         This type is in the value set and its semantics equivalent
         to the CounterBasedGauge64 SMIv2 textual convention defined
         in RFC 2856
       </xs:documentation>
     </xs:annotation>

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

   <xs:simpleType name="object-identifier">
     <xs:annotation>
       <xs:documentation>
         The object-identifier type represents administratively
         assigned names in a registration-hierarchical-name tree.

         Values of this type are denoted as a sequence of numerical
         non-negative sub-identifier values. Each sub-identifier
         value MUST NOT exceed 2^32-1 (4294967295). Sub-identifiers
         are separated by single dots and without any intermediate
         white space.

         Although the number of sub-identifiers is not limited,
         module designers should realize that there may be
         implementations that stick with the SMIv2 limit of 128
         sub-identifiers.

         This type is a superset of the SMIv2 OBJECT IDENTIFIER type
         since it is not restricted to 128 sub-identifiers.
       </xs:documentation>
     </xs:annotation>

     <xs:restriction base="xs:string">
       <xs:pattern value="(([0-1](\.[1-3]?[0-9]))|(2\.(0|([1-9]\d*)))
                          )(\.(0|([1-9]\d*)))*"/>
     </xs:restriction>
   </xs:simpleType>

   <xs:simpleType name="object-identifier-128">
     <xs:annotation>
       <xs:documentation>
         This type represents object-identifiers restricted to 128
         sub-identifiers.

         This type is in the value set and its semantics equivalent to
         the OBJECT IDENTIFIER type of the SMIv2.
       </xs:documentation>
     </xs:annotation>



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     <xs:restriction base="object-identifier">
       <xs:pattern value="\d*(.\d){1,127}"/>
     </xs:restriction>
   </xs:simpleType>

   <xs:simpleType name="date-and-time">
     <xs:annotation>
       <xs:documentation>
         The date-and-time type is a profile of the ISO 8601
         standard for representation of dates and times using the
         Gregorian calendar. The format is most easily described
         using the following ABFN (see RFC 3339):

         date-fullyear   = 4DIGIT
         date-month      = 2DIGIT  ; 01-12
         date-mday       = 2DIGIT  ; 01-28, 01-29, 01-30, 01-31
         time-hour       = 2DIGIT  ; 00-23
         time-minute     = 2DIGIT  ; 00-59
         time-second     = 2DIGIT  ; 00-58, 00-59, 00-60
         time-secfrac    = "." 1*DIGIT
         time-numoffset  = ("+" / "-") time-hour ":" time-minute
         time-offset     = "Z" / time-numoffset

         partial-time    = time-hour ":" time-minute ":" time-second
                           [time-secfrac]
         full-date       = date-fullyear "-" date-month "-" date-mday
         full-time       = partial-time time-offset

         date-time       = full-date "T" full-time

         The date-and-time type is compatible with the dateTime XML
         schema type except that dateTime allows negative years
         which are not allowed by RFC 3339.

         This type is not equivalent to the DateAndTime textual
         convention of the SMIv2 since RFC 3339 uses a different
         separator between full-date and full-time and provides
         higher resolution of time-secfrac.
       </xs:documentation>
     </xs:annotation>

     <xs:restriction base="xs:string">
       <xs:pattern value="\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}(\.\d+)?
                          (Z|(\+|-)\d{2}:\d{2})"/>
     </xs:restriction>
   </xs:simpleType>

   <xs:simpleType name="timeticks">



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     <xs:annotation>
       <xs:documentation>
         The timeticks type represents a non-negative integer which
         represents the time, modulo 2^32 (4294967296 decimal), in
         hundredths of a second between two epochs. When objects
         are defined which use this type, the description of the
         object identifies both of the reference epochs.

         This type is in the value set and its semantics equivalent to
         the TimeStamp textual convention of the SMIv2.
       </xs:documentation>
     </xs:annotation>

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

   <xs:simpleType name="timestamp">
     <xs:annotation>
       <xs:documentation>
         The timestamp type represents the value of an associated
         timeticks object at which a specific occurrence happened.
         The specific occurrence must be defined in the description
         of any object defined using this type.  When the specific
         occurrence occurred prior to the last time the associated
         timeticks attribute was zero, then the timestamp value is
         zero.  Note that this requires all timestamp values to be
         reset to zero when the value of the associated timeticks
         attribute reaches 497+ days and wraps around to zero.

         The associated timeticks object must be specified
         in the description of any object using this type.

         This type is in the value set and its semantics equivalent to
         the TimeStamp textual convention of the SMIv2.
       </xs:documentation>
     </xs:annotation>

     <xs:restriction base="yang:timeticks">
     </xs:restriction>
   </xs:simpleType>

   <xs:simpleType name="phys-address">
     <xs:annotation>
       <xs:documentation>
         Represents media- or physical-level addresses represented
         as a sequence octets, each octet represented by two hexadecimal
         numbers. Octets are separated by colons.



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         This type is in the value set and its semantics equivalent to
         the PhysAddress textual convention of the SMIv2.
       </xs:documentation>
     </xs:annotation>

     <xs:restriction base="xs:string">
       <xs:pattern value="([0-9a0-fA-F]{2}(:[0-9a0-fA-F]{2})*)?"/>
     </xs:restriction>
   </xs:simpleType>


 </xs:schema>

A.2.  XSD of Internet Specific Derived Types

 <?xml version="1.0" encoding="UTF-8"?>
 <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
            targetNamespace="urn:ietf:params:xml:ns:yang:inet-types"
            xmlns="urn:ietf:params:xml:ns:yang:inet-types"
            xmlns:inet="urn:ietf:params:xml:ns:yang:inet-types"
            elementFormDefault="qualified"
            attributeFormDefault="unqualified"
            version="2008-11-03"
            xml:lang="en">

   <xs:annotation>
     <xs:documentation>
       This module contains a collection of generally useful derived
       YANG data types for Internet addresses and related things.

       Copyright (C) The IETF Trust (2008).  This version of this
       YANG module is part of RFC XXXX; see the RFC itself for full
       legal notices.
     </xs:documentation>
   </xs:annotation>

   <!-- YANG typedefs -->

   <xs:simpleType name="ip-version">
     <xs:annotation>
       <xs:documentation>
         This value represents the version of the IP protocol.

         This type is in the value set and its semantics equivalent
         to the InetVersion textual convention of the SMIv2. However,
         the lexical appearance is different from the InetVersion
         textual convention.
       </xs:documentation>



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     </xs:annotation>

     <xs:restriction base="xs:string">
       <xs:enumeration value="unknown"/>
       <xs:enumeration value="ipv4"/>
       <xs:enumeration value="ipv6"/>
     </xs:restriction>
   </xs:simpleType>

   <xs:simpleType name="dscp">
     <xs:annotation>
       <xs:documentation>
         The dscp type represents a Differentiated Services Code-Point
         that may be used for marking packets in a traffic stream.

         This type is in the value set and its semantics equivalent
         to the Dscp textual convention of the SMIv2.
       </xs:documentation>
     </xs:annotation>

     <xs:restriction base="xs:unsignedByte">
       <xs:minInclusive value="0"/>
       <xs:maxInclusive value="63"/>
     </xs:restriction>
   </xs:simpleType>

   <xs:simpleType name="flow-label">
     <xs:annotation>
       <xs:documentation>
         The flow-label type represents flow identifier or Flow Label
         in an IPv6 packet header that may be used to discriminate
         traffic flows.

         This type is in the value set and its semantics equivalent
         to the IPv6FlowLabel textual convention of the SMIv2.
       </xs:documentation>
     </xs:annotation>

     <xs:restriction base="xs:unsignedInt">
       <xs:minInclusive value="0"/>
       <xs:maxInclusive value="1048575"/>
     </xs:restriction>
   </xs:simpleType>

   <xs:simpleType name="port-number">
     <xs:annotation>
       <xs:documentation>
         The port-number type represents a 16-bit port number of an



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         Internet transport layer protocol such as UDP, TCP, DCCP or
         SCTP. Port numbers are assigned by IANA.  A current list of
         all assignments is available from &lt;http://www.iana.org/&gt;.

         Note that the value zero is not a valid port number. A union
         type might be used in situations where the value zero is
         meaningful.

         This type is in the value set and its semantics equivalent
         to the InetPortNumber textual convention of the SMIv2.
       </xs:documentation>
     </xs:annotation>

     <xs:restriction base="xs:unsignedShort">
       <xs:minInclusive value="1"/>
       <xs:maxInclusive value="65535"/>
     </xs:restriction>
   </xs:simpleType>

   <xs:simpleType name="autonomous-system-number">
     <xs:annotation>
       <xs:documentation>
         The as-number type represents autonomous system numbers
         which identify an Autonomous System (AS). An AS is a set
         of routers under a single technical administration, using
         an interior gateway protocol and common metrics to route
         packets within the AS, and using an exterior gateway
         protocol to route packets to other ASs'. IANA maintains
         the AS number space and has delegated large parts to the
         regional registries.

         Autonomous system numbers are currently limited to 16 bits
         (0..65535). There is however work in progress to enlarge
         the autonomous system number space to 32 bits. This
         textual convention therefore uses an uint32 base type
         without a range restriction in order to support a larger
         autonomous system number space.

         This type is in the value set and its semantics equivalent
         to the InetAutonomousSystemNumber textual convention of
         the SMIv2.
       </xs:documentation>
     </xs:annotation>

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




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   <xs:simpleType name="ip-address">
     <xs:annotation>
       <xs:documentation>
         The ip-address type represents an IP address and is IP
         version neutral. The format of the textual representations
         implies the IP version.
       </xs:documentation>
     </xs:annotation>

     <xs:union>
       <xs:simpleType>
         <xs:restriction base="inet:ipv4-address">
         </xs:restriction>
       </xs:simpleType>
       <xs:simpleType>
         <xs:restriction base="inet:ipv6-address">
         </xs:restriction>
       </xs:simpleType>
     </xs:union>
   </xs:simpleType>

   <xs:simpleType name="ipv4-address">
     <xs:annotation>
       <xs:documentation>
         The ipv4-address type represents an IPv4 address in
         dotted-quad notation. The IPv4 address may include a zone
         index, separated by a % sign.

         The zone index is used to disambiguate identical address
         values.  For link-local addresses, the zone index will
         typically be the interface index number or the name of an
         interface. If the zone index is not present, the default
         zone of the device will be used.
       </xs:documentation>
     </xs:annotation>

     <xs:restriction base="xs:string">
       <xs:pattern value="((0|(1[0-9]{0,2})|(2(([0-4][0-9]?)|(5[0-5]?
                          )|([6-9]?)))|([3-9][0-9]?))\.){3}(0|(1[0-9]{
                          0,2})|(2(([0-4][0-9]?)|(5[0-5]?)|([6-9]?)))|
                          ([3-9][0-9]?))(%[\p{N}\p{L}]+)?"/>
     </xs:restriction>
   </xs:simpleType>

   <xs:simpleType name="ipv6-address">
     <xs:annotation>
       <xs:documentation>
         The ipv6-address type represents an IPv6 address in full,



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         mixed, shortened and shortened mixed notation.  The IPv6
         address may include a zone index, separated by a % sign.

         The zone index is used to disambiguate identical address
         values.  For link-local addresses, the zone index will
         typically be the interface index number or the name of an
         interface. If the zone index is not present, the default
         zone of the device will be used.
       </xs:documentation>
     </xs:annotation>

     <xs:restriction base="xs:string">
       <xs:pattern value="((([0-9a-fA-F]{1,4}:){7})([0-9a-fA-F]{1,4})
                          (%[\p{N}\p{L}]+)?)|((([0-9a-fA-F]{1,4}:){6})
                          (([0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{
                          1,3}))(%[\p{N}\p{L}]+)?)|((([0-9a-fA-F]{1,4}
                          :)*([0-9a-fA-F]{1,4}))*(::)(([0-9a-fA-F]{1,4
                          }:)*([0-9a-fA-F]{1,4}))*(%[\p{N}\p{L}]+)?)|(
                          (([0-9a-fA-F]{1,4}:)*([0-9a-fA-F]{1,4}))*(::
                          )(([0-9a-fA-F]{1,4}:)*([0-9a-fA-F]{1,4}))*((
                          [0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,
                          3}))(%[\p{N}\p{L}]+)?)"/>
     </xs:restriction>
   </xs:simpleType>

   <xs:simpleType name="ip-prefix">
     <xs:annotation>
       <xs:documentation>
         The ip-prefix type represents an IP prefix and is IP
         version neutral. The format of the textual representations
         implies the IP version.
       </xs:documentation>
     </xs:annotation>

     <xs:union>
       <xs:simpleType>
         <xs:restriction base="inet:ipv4-prefix">
         </xs:restriction>
       </xs:simpleType>
       <xs:simpleType>
         <xs:restriction base="inet:ipv6-prefix">
         </xs:restriction>
       </xs:simpleType>
     </xs:union>
   </xs:simpleType>

   <xs:simpleType name="ipv4-prefix">
     <xs:annotation>



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       <xs:documentation>
         The ipv4-prefix type represents an IPv4 address prefix.
         The prefix length is given by the number following the
         slash character and must be less than or equal to 32.

         A prefix length value of n corresponds to an IP address
         mask which has n contiguous 1-bits from the most
         significant bit (MSB) and all other bits set to 0.

         The IPv4 address represented in dotted quad notation
         should have all bits that do not belong to the prefix
         set to zero.
       </xs:documentation>
     </xs:annotation>

     <xs:restriction base="xs:string">
       <xs:pattern value="(([0-1]?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])\.)
                          {3}([0-1]?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])/\
                          d+"/>
     </xs:restriction>
   </xs:simpleType>

   <xs:simpleType name="ipv6-prefix">
     <xs:annotation>
       <xs:documentation>
         The ipv6-prefix type represents an IPv6 address prefix.
         The prefix length is given by the number following the
         slash character and must be less than or equal 128.

         A prefix length value of n corresponds to an IP address
         mask which has n contiguous 1-bits from the most
         significant bit (MSB) and all other bits set to 0.

         The IPv6 address should have all bits that do not belong
         to the prefix set to zero.
       </xs:documentation>
     </xs:annotation>

     <xs:restriction base="xs:string">
       <xs:pattern value="((([0-9a-fA-F]{1,4}:){7})([0-9a-fA-F]{1,4})
                          /\d+)|((([0-9a-fA-F]{1,4}:){6})(([0-9]{1,3}\
                          .[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}))/\d+)|(
                          (([0-9a-fA-F]{1,4}:)*([0-9a-fA-F]{1,4}))*(::
                          )(([0-9a-fA-F]{1,4}:)*([0-9a-fA-F]{1,4}))*/\
                          d+)|((([0-9a-fA-F]{1,4}:)*([0-9a-fA-F]{1,4})
                          )*(::)(([0-9a-fA-F]{1,4}:)*([0-9a-fA-F]{1,4}
                          ))*(([0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-
                          9]{1,3}))/\d+)"/>



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

   <xs:simpleType name="domain-name">
     <xs:annotation>
       <xs:documentation>
         The domain-name type represents a DNS domain name. The
         name SHOULD be fully qualified whenever possible.

         The description clause of objects using the domain-name
         type MUST describe how (and when) these names are
         resolved to IP addresses.

         Note that the resolution of a domain-name value may
         require to query multiple DNS records (e.g., A for IPv4
         and AAAA for IPv6). The order of the resolution process
         and which DNS record takes precedence depends on the
         configuration of the resolver.
       </xs:documentation>
     </xs:annotation>

     <xs:restriction base="xs:string">
       <xs:pattern value="([a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9]\.)*[a
                          -zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9]"/>
     </xs:restriction>
   </xs:simpleType>

   <xs:simpleType name="host">
     <xs:annotation>
       <xs:documentation>
         The host type represents either an IP address or a DNS
         domain name.
       </xs:documentation>
     </xs:annotation>

     <xs:union>
       <xs:simpleType>
         <xs:restriction base="inet:ip-address">
         </xs:restriction>
       </xs:simpleType>
       <xs:simpleType>
         <xs:restriction base="inet:domain-name">
         </xs:restriction>
       </xs:simpleType>
     </xs:union>
   </xs:simpleType>

   <xs:simpleType name="uri">



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     <xs:annotation>
       <xs:documentation>
         The uri type represents a Uniform Resource Identifier
         (URI) as defined by STD 66.

         Objects using the uri type must be in US-ASCII encoding,
         and MUST be normalized as described by RFC 3986 Sections
         6.2.1, 6.2.2.1, and 6.2.2.2.  All unnecessary
         percent-encoding is removed, and all case-insensitive
         characters are set to lowercase except for hexadecimal
         digits, which are normalized to uppercase as described in
         Section 6.2.2.1.

         The purpose of this normalization is to help provide
         unique URIs.  Note that this normalization is not
         sufficient to provide uniqueness.  Two URIs that are
         textually distinct after this normalization may still be
         equivalent.

         Objects using the uri type may restrict the schemes that
         they permit.  For example, 'data:' and 'urn:' schemes
         might not be appropriate.

         A zero-length URI is not a valid URI.  This can be used to
         express 'URI absent' where required

         This type is in the value set and its semantics equivalent
         to the Uri textual convention of the SMIv2.
       </xs:documentation>
     </xs:annotation>

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


 </xs:schema>

A.3.  XSD of IEEE Specific Derived Types

 <?xml version="1.0" encoding="UTF-8"?>
 <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
            targetNamespace="urn:ietf:params:xml:ns:yang:ieee-types"
            xmlns="urn:ietf:params:xml:ns:yang:ieee-types"
            xmlns:ieee="urn:ietf:params:xml:ns:yang:ieee-types"
            elementFormDefault="qualified"
            attributeFormDefault="unqualified"
            version="2008-11-03"



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            xml:lang="en"
            xmlns:yang="urn:ietf:params:xml:ns:yang:yang-types">

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

   <xs:annotation>
     <xs:documentation>
       This module contains a collection of generally useful derived
       YANG data types for IEEE 802 addresses and related things.

       Copyright (C) The IETF Trust (2008).  This version of this
       YANG module is part of RFC XXXX; see the RFC itself for full
       legal notices.
     </xs:documentation>
   </xs:annotation>

   <!-- YANG typedefs -->

   <xs:simpleType name="mac-address">
     <xs:annotation>
       <xs:documentation>
         The mac-address type represents an 802 MAC address represented
         in the `canonical' order defined by IEEE 802.1a, i.e., as if it
         were transmitted least significant bit first, even though 802.5
         (in contrast to other 802.x protocols) requires MAC addresses
         to be transmitted most significant bit first.

         This type is in the value set and its semantics equivalent to
         the MacAddress textual convention of the SMIv2.
       </xs:documentation>
     </xs:annotation>

     <xs:restriction base="xs:string">
       <xs:pattern value="[0-9a-fA-F]{2}(:[0-9a-fA-F]{2}){5}"/>
     </xs:restriction>
   </xs:simpleType>

   <xs:simpleType name="bridgeid">
     <xs:annotation>
       <xs:documentation>
         The bridgeid type represents identifiers that uniquely
         identify a bridge.  Its first four hexadecimal digits
         contain a priority value followed by a colon. The
         remaining characters contain the MAC address used to
         refer to a bridge in a unique fashion (typically, the
         numerically smallest MAC address of all ports on the
         bridge).



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         This type is in the value set and its semantics equivalent
         to the BridgeId textual convention of the SMIv2. However,
         since the BridgeId textual convention does not prescribe
         a lexical representation, the appearance might be different.
       </xs:documentation>
     </xs:annotation>

     <xs:restriction base="xs:string">
       <xs:pattern value="[0-9a-fA-F]{4}(:[0-9a-fA-F]{2}){6}"/>
     </xs:restriction>
   </xs:simpleType>

   <xs:simpleType name="vlanid">
     <xs:annotation>
       <xs:documentation>
         The vlanid type uniquely identifies a VLAN. This is the
         12-bit VLAN-ID used in the VLAN Tag header. The range is
         defined by the referenced specification.

         This type is in the value set and its semantics equivalent to
         the VlanId textual convention of the SMIv2.
       </xs:documentation>
     </xs:annotation>

     <xs:restriction base="xs:unsignedShort">
       <xs:minInclusive value="1"/>
       <xs:maxInclusive value="4094"/>
     </xs:restriction>
   </xs:simpleType>


 </xs:schema>



















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Appendix B.  RelaxNG Translations

   This appendix provides RelaxNG translations of the types defined in
   this document.  This appendix is informative and not normative.

B.1.  RelaxNG of Core YANG Derived Types

namespace a = "http://relaxng.org/ns/compatibility/annotations/1.0"
namespace dc = "http://purl.org/dc/terms"
namespace dsrl = "http://purl.oclc.org/dsdl/dsrl"
namespace nm = "urn:ietf:params:xml:ns:netmod:dsdl-attrib:1"
namespace sch = "http://purl.oclc.org/dsdl/schematron"
namespace yang = "urn:ietf:params:xml:ns:yang:yang-types"

dc:creator [
  "IETF NETMOD (NETCONF Data Modeling Language) Working Group"
]
dc:description [
  "This module contains a collection of generally useful derived\x{a}" ~
  "YANG data types.\x{a}" ~
  "\x{a}" ~
  "Copyright (C) The IETF Trust (2008).  This version of this\x{a}" ~
  "YANG module is part of RFC XXXX; see the RFC itself for full\x{a}" ~
  "legal notices."
]
dc:issued [ "2008-11-03" ]
dc:source [ "YANG module 'yang-types' (automatic translation)" ]
dc:contributor [
  "WG Web:   <http://tools.ietf.org/wg/netmod/>\x{a}" ~
  "WG List:  <mailto:netmod@ietf.org>\x{a}" ~
  "\x{a}" ~
  "WG Chair: David Partain\x{a}" ~
  "          <mailto:david.partain@ericsson.com>\x{a}" ~
  "\x{a}" ~
  "WG Chair: David Harrington\x{a}" ~
  "          <mailto:ietfdbh@comcast.net>\x{a}" ~
  "\x{a}" ~
  "Editor:   Juergen Schoenwaelder\x{a}" ~
  "          <mailto:j.schoenwaelder@jacobs-university.de>"
]

## The counter32 type represents a non-negative integer
## which monotonically increases until it reaches a
## maximum value of 2^32-1 (4294967295 decimal), when it
## wraps around and starts increasing again from zero.
##
## Counters have no defined `initial' value, and thus, a
## single value of a counter has (in general) no information



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## content.  Discontinuities in the monotonically increasing
## value normally occur at re-initialization of the
## management system, and at other times as specified in the
## description of an object instance using this type.  If
## such other times can occur, for example, the creation of
## an object instance of type counter32 at times other than
## re-initialization, then a corresponding object should be
## defined, with an appropriate type, to indicate the last
## discontinuity.
##
## The counter32 type should not be used for configuration
## objects. A default statement should not be used for
## attributes with a type value of counter32.
##
## This type is in the value set and its semantics equivalent
## to the Counter32 type of the SMIv2.

## See: RFC 2578: Structure of Management Information Version 2 (SMIv2)
counter32 = xsd:unsignedInt

## The zero-based-counter32 type represents a counter32
## which has the defined `initial' value zero.
##
## Objects of this type will be set to zero(0) on creation
## and will thereafter count appropriate events, wrapping
## back to zero(0) when the value 2^32 is reached.
##
## Provided that an application discovers the new object within
## the minimum time to wrap it can use the initial value as a
## delta since it last polled the table of which this object is
## part.  It is important for a management station to be aware
## of this minimum time and the actual time between polls, and
## to discard data if the actual time is too long or there is
## no defined minimum time.
##
## This type is in the value set and its semantics equivalent
## to the ZeroBasedCounter32 textual convention of the SMIv2.

## See: RFC 2021: Remote Network Monitoring Management Information
##           Base Version 2 using SMIv2
zero-based-counter32 = counter32 >> dsrl:default-content [ "0" ]

## The counter64 type represents a non-negative integer
## which monotonically increases until it reaches a
## maximum value of 2^64-1 (18446744073709551615), when
## it wraps around and starts increasing again from zero.
##
## Counters have no defined `initial' value, and thus, a



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## single value of a counter has (in general) no information
## content.  Discontinuities in the monotonically increasing
## value normally occur at re-initialization of the
## management system, and at other times as specified in the
## description of an object instance using this type.  If
## such other times can occur, for example, the creation of
## an object instance of type counter64 at times other than
## re-initialization, then a corresponding object should be
## defined, with an appropriate type, to indicate the last
## discontinuity.
##
## The counter64 type should not be used for configuration
## objects. A default statement should not be used for
## attributes with a type value of counter64.
##
## This type is in the value set and its semantics equivalent
## to the Counter64 type of the SMIv2.

## See: RFC 2578: Structure of Management Information Version 2 (SMIv2)
counter64 = xsd:unsignedLong

## The zero-based-counter64 type represents a counter64 which
## has the defined `initial' value zero.
##
## Objects of this type will be set to zero(0) on creation
## and will thereafter count appropriate events, wrapping
## back to zero(0) when the value 2^64 is reached.
##
## Provided that an application discovers the new object within
## the minimum time to wrap it can use the initial value as a
## delta since it last polled the table of which this object is
## part.  It is important for a management station to be aware
## of this minimum time and the actual time between polls, and
## to discard data if the actual time is too long or there is
## no defined minimum time.
##
## This type is in the value set and its semantics equivalent
## to the ZeroBasedCounter64 textual convention of the SMIv2.

## See: RFC 2856: Textual Conventions for Additional High Capacity
##           Data Types
zero-based-counter64 = counter64 >> dsrl:default-content [ "0" ]

## The gauge32 type represents a non-negative integer, which
## may increase or decrease, but shall never exceed a maximum
## value, nor fall below a minimum value.  The maximum value
## can not be greater than 2^32-1 (4294967295 decimal), and
## the minimum value can not be smaller than 0.  The value of



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## a gauge32 has its maximum value whenever the information
## being modeled is greater than or equal to its maximum
## value, and has its minimum value whenever the information
## being modeled is smaller than or equal to its minimum value.
## If the information being modeled subsequently decreases
## below (increases above) the maximum (minimum) value, the
## gauge32 also decreases (increases).
##
## This type is in the value set and its semantics equivalent
## to the Counter32 type of the SMIv2.

## See: RFC 2578: Structure of Management Information Version 2 (SMIv2)
gauge32 = xsd:unsignedInt

## The gauge64 type represents a non-negative integer, which
## may increase or decrease, but shall never exceed a maximum
## value, nor fall below a minimum value.  The maximum value
## can not be greater than 2^64-1 (18446744073709551615), and
## the minimum value can not be smaller than 0.  The value of
## a gauge64 has its maximum value whenever the information
## being modeled is greater than or equal to its maximum
## value, and has its minimum value whenever the information
## being modeled is smaller than or equal to its minimum value.
## If the information being modeled subsequently decreases
## below (increases above) the maximum (minimum) value, the
## gauge64 also decreases (increases).
##
## This type is in the value set and its semantics equivalent
## to the CounterBasedGauge64 SMIv2 textual convention defined
## in RFC 2856

## See: RFC 2856: Textual Conventions for Additional High Capacity
##           Data Types
gauge64 = xsd:unsignedLong

## The object-identifier type represents administratively
## assigned names in a registration-hierarchical-name tree.
##
## Values of this type are denoted as a sequence of numerical
## non-negative sub-identifier values. Each sub-identifier
## value MUST NOT exceed 2^32-1 (4294967295). Sub-identifiers
## are separated by single dots and without any intermediate
## white space.
##
## Although the number of sub-identifiers is not limited,
## module designers should realize that there may be
## implementations that stick with the SMIv2 limit of 128
## sub-identifiers.



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##
## This type is a superset of the SMIv2 OBJECT IDENTIFIER type
## since it is not restricted to 128 sub-identifiers.

## See: ISO/IEC 9834-1: Information technology -- Open Systems
## Interconnection -- Procedures for the operation of OSI
## Registration Authorities: General procedures and top
## arcs of the ASN.1 Object Identifier tree
object-identifier =
  xsd:string {
    pattern =
      "(([0-1](\.[1-3]?[0-9]))|(2\.(0|([1-9]\d*))))(\.(0|([1-9]\d*)))*"
  }

## This type represents object-identifiers restricted to 128
## sub-identifiers.
##
## This type is in the value set and its semantics equivalent to
## the OBJECT IDENTIFIER type of the SMIv2.

## See: RFC 2578: Structure of Management Information Version 2 (SMIv2)
object-identifier-128 = object-identifier

## The date-and-time type is a profile of the ISO 8601
##       standard for representation of dates and times using the
##       Gregorian calendar. The format is most easily described
##       using the following ABFN (see RFC 3339):
##
##       date-fullyear   = 4DIGIT
##       date-month      = 2DIGIT  ; 01-12
##       date-mday       = 2DIGIT  ; 01-28, 01-29, 01-30, 01-31
##       time-hour       = 2DIGIT  ; 00-23
##       time-minute     = 2DIGIT  ; 00-59
##       time-second     = 2DIGIT  ; 00-58, 00-59, 00-60
##       time-secfrac    = "." 1*DIGIT
##       time-numoffset  = ("+" / "-") time-hour ":" time-minute
##       time-offset     = "Z" / time-numoffset
##
##       partial-time    = time-hour ":" time-minute ":" time-second
##                         [time-secfrac]
##       full-date       = date-fullyear "-" date-month "-" date-mday
##       full-time       = partial-time time-offset
##
##       date-time       = full-date "T" full-time
##
##       The date-and-time type is compatible with the dateTime XML
##       schema type except that dateTime allows negative years
##       which are not allowed by RFC 3339.



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##
##       This type is not equivalent to the DateAndTime textual
##       convention of the SMIv2 since RFC 3339 uses a different
##       separator between full-date and full-time and provides
##       higher resolution of time-secfrac.

## See: RFC 3339: Date and Time on the Internet: Timestamps
## RFC 2579: Textual Conventions for SMIv2
date-and-time =
  xsd:string {
    pattern =
      "\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}(\.\d+)?(Z|(\+|-)\d{2}:\d{2})"
  }

## The timeticks type represents a non-negative integer which
## represents the time, modulo 2^32 (4294967296 decimal), in
## hundredths of a second between two epochs. When objects
## are defined which use this type, the description of the
## object identifies both of the reference epochs.
##
## This type is in the value set and its semantics equivalent to
## the TimeStamp textual convention of the SMIv2.

## See: RFC 2579: Textual Conventions for SMIv2
timeticks = xsd:unsignedInt

## The timestamp type represents the value of an associated
## timeticks object at which a specific occurrence happened.
## The specific occurrence must be defined in the description
## of any object defined using this type.  When the specific
## occurrence occurred prior to the last time the associated
## timeticks attribute was zero, then the timestamp value is
## zero.  Note that this requires all timestamp values to be
## reset to zero when the value of the associated timeticks
## attribute reaches 497+ days and wraps around to zero.
##
## The associated timeticks object must be specified
## in the description of any object using this type.
##
## This type is in the value set and its semantics equivalent to
## the TimeStamp textual convention of the SMIv2.

## See: RFC 2579: Textual Conventions for SMIv2
timestamp = timeticks

## Represents media- or physical-level addresses represented
## as a sequence octets, each octet represented by two hexadecimal
## numbers. Octets are separated by colons.



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##
## This type is in the value set and its semantics equivalent to
## the PhysAddress textual convention of the SMIv2.

## See: RFC 2579: Textual Conventions for SMIv2
phys-address =
  xsd:string { pattern = "([0-9a0-fA-F]{2}(:[0-9a0-fA-F]{2})*)?" }

B.2.  RelaxNG of Internet Specific Derived Types

namespace a = "http://relaxng.org/ns/compatibility/annotations/1.0"
namespace dc = "http://purl.org/dc/terms"
namespace dsrl = "http://purl.oclc.org/dsdl/dsrl"
namespace inet = "urn:ietf:params:xml:ns:yang:inet-types"
namespace nm = "urn:ietf:params:xml:ns:netmod:dsdl-attrib:1"
namespace sch = "http://purl.oclc.org/dsdl/schematron"

dc:creator [
  "IETF NETMOD (NETCONF Data Modeling Language) Working Group"
]
dc:description [
  "This module contains a collection of generally useful derived\x{a}" ~
  "YANG data types for Internet addresses and related things.\x{a}" ~
  "\x{a}" ~
  "Copyright (C) The IETF Trust (2008).  This version of this\x{a}" ~
  "YANG module is part of RFC XXXX; see the RFC itself for full\x{a}" ~
  "legal notices."
]
dc:issued [ "2008-11-03" ]
dc:source [ "YANG module 'inet-types' (automatic translation)" ]
dc:contributor [
  "WG Web:   <http://tools.ietf.org/wg/netmod/>\x{a}" ~
  "WG List:  <mailto:netmod@ietf.org>\x{a}" ~
  "\x{a}" ~
  "WG Chair: David Partain\x{a}" ~
  "          <mailto:david.partain@ericsson.com>\x{a}" ~
  "\x{a}" ~
  "WG Chair: David Harrington\x{a}" ~
  "          <mailto:ietfdbh@comcast.net>\x{a}" ~
  "\x{a}" ~
  "Editor:   Juergen Schoenwaelder\x{a}" ~
  "          <mailto:j.schoenwaelder@jacobs-university.de>"
]

## This value represents the version of the IP protocol.
##
## This type is in the value set and its semantics equivalent
## to the InetVersion textual convention of the SMIv2. However,



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## the lexical appearance is different from the InetVersion
## textual convention.

## See: RFC  791: Internet Protocol
## RFC 2460: Internet Protocol, Version 6 (IPv6) Specification
## RFC 4001: Textual Conventions for Internet Network Addresses
ip-version = "unknown" | "ipv4" | "ipv6"

## The dscp type represents a Differentiated Services Code-Point
## that may be used for marking packets in a traffic stream.
##
## This type is in the value set and its semantics equivalent
## to the Dscp textual convention of the SMIv2.

## See: RFC 3289: Management Information Base for the Differentiated
##           Services Architecture
## RFC 2474: Definition of the Differentiated Services Field
##           (DS Field) in the IPv4 and IPv6 Headers
## RFC 2780: IANA Allocation Guidelines For Values In
##           the Internet Protocol and Related Headers
dscp = xsd:unsignedByte { minInclusive = "0" maxInclusive = "63" }

## The flow-label type represents flow identifier or Flow Label
## in an IPv6 packet header that may be used to discriminate
## traffic flows.
##
## This type is in the value set and its semantics equivalent
## to the IPv6FlowLabel textual convention of the SMIv2.

## See: RFC 3595: Textual Conventions for IPv6 Flow Label
## RFC 2460: Internet Protocol, Version 6 (IPv6) Specification
flow-label =
  xsd:unsignedInt { minInclusive = "0" maxInclusive = "1048575" }

## The port-number type represents a 16-bit port number of an
## Internet transport layer protocol such as UDP, TCP, DCCP or
## SCTP. Port numbers are assigned by IANA.  A current list of
## all assignments is available from <http://www.iana.org/>.
##
## Note that the value zero is not a valid port number. A union
## type might be used in situations where the value zero is
## meaningful.
##
## This type is in the value set and its semantics equivalent
## to the InetPortNumber textual convention of the SMIv2.

## See: RFC  768: User Datagram Protocol
## RFC  793: Transmission Control Protocol



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## RFC 2960: Stream Control Transmission Protocol
## RFC 4340: Datagram Congestion Control Protocol (DCCP)
## RFC 4001: Textual Conventions for Internet Network Addresses
port-number =
  xsd:unsignedShort { minInclusive = "1" maxInclusive = "65535" }

## The as-number type represents autonomous system numbers
## which identify an Autonomous System (AS). An AS is a set
## of routers under a single technical administration, using
## an interior gateway protocol and common metrics to route
## packets within the AS, and using an exterior gateway
## protocol to route packets to other ASs'. IANA maintains
## the AS number space and has delegated large parts to the
## regional registries.
##
## Autonomous system numbers are currently limited to 16 bits
## (0..65535). There is however work in progress to enlarge
## the autonomous system number space to 32 bits. This
## textual convention therefore uses an uint32 base type
## without a range restriction in order to support a larger
## autonomous system number space.
##
## This type is in the value set and its semantics equivalent
## to the InetAutonomousSystemNumber textual convention of
## the SMIv2.

## See: RFC 1930: Guidelines for creation, selection, and registration
##           of an Autonomous System (AS)
## RFC 4271: A Border Gateway Protocol 4 (BGP-4)
## RFC 4001: Textual Conventions for Internet Network Addresses
autonomous-system-number = xsd:unsignedInt

## The ip-address type represents an IP address and is IP
## version neutral. The format of the textual representations
## implies the IP version.
ip-address = ipv4-address | ipv6-address

## The ipv4-address type represents an IPv4 address in
## dotted-quad notation. The IPv4 address may include a zone
## index, separated by a % sign.
##
## The zone index is used to disambiguate identical address
## values.  For link-local addresses, the zone index will
## typically be the interface index number or the name of an
## interface. If the zone index is not present, the default
## zone of the device will be used.
ipv4-address =
  xsd:string {



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    pattern =
      "((0|(1[0-9]{0,2})|(2(([0-4][0-9]?)|(5[0-5]?)|([6-9]?)"
    ~ "))|([3-9][0-9]?))\.){3}(0|(1[0-9]{0,2})|(2(([0-4][0-9]?)|(5["
    ~ "0-5]?)|([6-9]?)))|([3-9][0-9]?))(%[\p{N}\p{L}]+)?"
  }

## The ipv6-address type represents an IPv6 address in full,
## mixed, shortened and shortened mixed notation.  The IPv6
## address may include a zone index, separated by a % sign.
##
## The zone index is used to disambiguate identical address
## values.  For link-local addresses, the zone index will
## typically be the interface index number or the name of an
## interface. If the zone index is not present, the default
## zone of the device will be used.

## See: RFC 4007: IPv6 Scoped Address Architecture
ipv6-address =
  xsd:string {
    pattern =
      "((([0-9a-fA-F]{1,4}:){7})([0-9a-fA-F]{1,4})(%[\p{N}\p"
    ~ "{L}]+)?)|((([0-9a-fA-F]{1,4}:){6})(([0-9]{1,3}\.[0-9]{1,3}\."
    ~ "[0-9]{1,3}\.[0-9]{1,3}))(%[\p{N}\p{L}]+)?)|((([0-9a-fA-F]{1,"
    ~ "4}:)*([0-9a-fA-F]{1,4}))*(::)(([0-9a-fA-F]{1,4}:)*([0-9a-fA-"
    ~ "F]{1,4}))*(%[\p{N}\p{L}]+)?)|((([0-9a-fA-F]{1,4}:)*([0-9a-fA"
    ~ "-F]{1,4}))*(::)(([0-9a-fA-F]{1,4}:)*([0-9a-fA-F]{1,4}))*(([0"
    ~ "-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}))(%[\p{N}\p{L}]"
    ~ "+)?)"
  }

## The ip-prefix type represents an IP prefix and is IP
## version neutral. The format of the textual representations
## implies the IP version.
ip-prefix = ipv4-prefix | ipv6-prefix

## The ipv4-prefix type represents an IPv4 address prefix.
## The prefix length is given by the number following the
## slash character and must be less than or equal to 32.
##
## A prefix length value of n corresponds to an IP address
## mask which has n contiguous 1-bits from the most
## significant bit (MSB) and all other bits set to 0.
##
## The IPv4 address represented in dotted quad notation
## should have all bits that do not belong to the prefix
## set to zero.
ipv4-prefix =
  xsd:string {



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    pattern =
      "(([0-1]?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])\.){3}([0-1]?"
    ~ "[0-9]?[0-9]|2[0-4][0-9]|25[0-5])/\d+"
  }

## The ipv6-prefix type represents an IPv6 address prefix.
## The prefix length is given by the number following the
## slash character and must be less than or equal 128.
##
## A prefix length value of n corresponds to an IP address
## mask which has n contiguous 1-bits from the most
## significant bit (MSB) and all other bits set to 0.
##
## The IPv6 address should have all bits that do not belong
## to the prefix set to zero.
ipv6-prefix =
  xsd:string {
    pattern =
      "((([0-9a-fA-F]{1,4}:){7})([0-9a-fA-F]{1,4})/\d+)|(((["
    ~ "0-9a-fA-F]{1,4}:){6})(([0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.["
    ~ "0-9]{1,3}))/\d+)|((([0-9a-fA-F]{1,4}:)*([0-9a-fA-F]{1,4}))*("
    ~ "::)(([0-9a-fA-F]{1,4}:)*([0-9a-fA-F]{1,4}))*/\d+)|((([0-9a-f"
    ~ "A-F]{1,4}:)*([0-9a-fA-F]{1,4}))*(::)(([0-9a-fA-F]{1,4}:)*([0"
    ~ "-9a-fA-F]{1,4}))*(([0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]"
    ~ "{1,3}))/\d+)"
  }

## The domain-name type represents a DNS domain name. The
## name SHOULD be fully qualified whenever possible.
##
## The description clause of objects using the domain-name
## type MUST describe how (and when) these names are
## resolved to IP addresses.
##
## Note that the resolution of a domain-name value may
## require to query multiple DNS records (e.g., A for IPv4
## and AAAA for IPv6). The order of the resolution process
## and which DNS record takes precedence depends on the
## configuration of the resolver.

## See: RFC 1034: Domain Names - Concepts and Facilities
## RFC 1123: Requirements for Internet Hosts -- Application
##           and Support
domain-name =
  xsd:string {
    pattern =
      "([a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9]\.)*[a-zA-Z0-9]["
    ~ "a-zA-Z0-9\-]*[a-zA-Z0-9]"



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  }

## The host type represents either an IP address or a DNS
## domain name.
host = ip-address | domain-name

## The uri type represents a Uniform Resource Identifier
## (URI) as defined by STD 66.
##
## Objects using the uri type must be in US-ASCII encoding,
## and MUST be normalized as described by RFC 3986 Sections
## 6.2.1, 6.2.2.1, and 6.2.2.2.  All unnecessary
## percent-encoding is removed, and all case-insensitive
## characters are set to lowercase except for hexadecimal
## digits, which are normalized to uppercase as described in
## Section 6.2.2.1.
##
## The purpose of this normalization is to help provide
## unique URIs.  Note that this normalization is not
## sufficient to provide uniqueness.  Two URIs that are
## textually distinct after this normalization may still be
## equivalent.
##
## Objects using the uri type may restrict the schemes that
## they permit.  For example, 'data:' and 'urn:' schemes
## might not be appropriate.
##
## A zero-length URI is not a valid URI.  This can be used to
## express 'URI absent' where required
##
## This type is in the value set and its semantics equivalent
## to the Uri textual convention of the SMIv2.

## See: RFC 3986: Uniform Resource Identifier (URI): Generic Syntax
## RFC 3305: Report from the Joint W3C/IETF URI Planning Interest
##           Group: Uniform Resource Identifiers (URIs), URLs,
##           and Uniform Resource Names (URNs): Clarifications
##           and Recommendations
## RFC 5017: MIB Textual Conventions for Uniform Resource
##           Identifiers (URIs)
uri = xsd:string

B.3.  RelaxNG of IEEE Specific Derived Types

namespace a = "http://relaxng.org/ns/compatibility/annotations/1.0"
namespace dc = "http://purl.org/dc/terms"
namespace dsrl = "http://purl.oclc.org/dsdl/dsrl"
namespace ieee = "urn:ietf:params:xml:ns:yang:ieee-types"



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namespace nm = "urn:ietf:params:xml:ns:netmod:dsdl-attrib:1"
namespace sch = "http://purl.oclc.org/dsdl/schematron"

dc:creator [
  "IETF NETMOD (NETCONF Data Modeling Language) Working Group"
]
dc:description [
  "This module contains a collection of generally useful derived\x{a}" ~
  "YANG data types for IEEE 802 addresses and related things.\x{a}" ~
  "\x{a}" ~
  "Copyright (C) The IETF Trust (2008).  This version of this\x{a}" ~
  "YANG module is part of RFC XXXX; see the RFC itself for full\x{a}" ~
  "legal notices."
]
dc:issued [ "2008-11-03" ]
dc:source [ "YANG module 'ieee-types' (automatic translation)" ]
dc:contributor [
  "WG Web:   <http://tools.ietf.org/wg/netmod/>\x{a}" ~
  "WG List:  <mailto:netmod@ietf.org>\x{a}" ~
  "\x{a}" ~
  "WG Chair: David Partain\x{a}" ~
  "          <mailto:david.partain@ericsson.com>\x{a}" ~
  "\x{a}" ~
  "WG Chair: David Harrington\x{a}" ~
  "          <mailto:ietfdbh@comcast.net>\x{a}" ~
  "\x{a}" ~
  "Editor:   Juergen Schoenwaelder\x{a}" ~
  "          <mailto:j.schoenwaelder@jacobs-university.de>"
]

## The mac-address type represents an 802 MAC address represented
## in the `canonical' order defined by IEEE 802.1a, i.e., as if it
## were transmitted least significant bit first, even though 802.5
## (in contrast to other 802.x protocols) requires MAC addresses
## to be transmitted most significant bit first.
##
## This type is in the value set and its semantics equivalent to
## the MacAddress textual convention of the SMIv2.

## See: RFC 2579: Textual Conventions for SMIv2
mac-address =
  xsd:string { pattern = "[0-9a-fA-F]{2}(:[0-9a-fA-F]{2}){5}" }

## The bridgeid type represents identifiers that uniquely
## identify a bridge.  Its first four hexadecimal digits
## contain a priority value followed by a colon. The
## remaining characters contain the MAC address used to
## refer to a bridge in a unique fashion (typically, the



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## numerically smallest MAC address of all ports on the
## bridge).
##
## This type is in the value set and its semantics equivalent
## to the BridgeId textual convention of the SMIv2. However,
## since the BridgeId textual convention does not prescribe
## a lexical representation, the appearance might be different.

## See: RFC 4188: Definitions of Managed Objects for Bridges
bridgeid = xsd:string { pattern = "[0-9a-fA-F]{4}(:[0-9a-fA-F]{2}){6}" }

## The vlanid type uniquely identifies a VLAN. This is the
## 12-bit VLAN-ID used in the VLAN Tag header. The range is
## defined by the referenced specification.
##
## This type is in the value set and its semantics equivalent to
## the VlanId textual convention of the SMIv2.

## See: IEEE Std 802.1Q 2003 Edition: Virtual Bridged Local
##           Area Networks
## RFC 4363: Definitions of Managed Objects for Bridges with
##           Traffic Classes, Multicast Filtering, and Virtual
##           LAN Extensions
vlanid = xsd:unsignedShort { minInclusive = "1" maxInclusive = "4094" }



























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Internet-Draft                 YANG-TYPES                  November 2008


Author's Address

   Juergen Schoenwaelder (editor)
   Jacobs University

   Email: j.schoenwaelder@jacobs-university.de













































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Internet-Draft                 YANG-TYPES                  November 2008


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