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rfc:rfc3732

Network Working Group S. Hollenbeck Request for Comments: 3732 VeriSign, Inc. Category: Standards Track March 2004

        Extensible Provisioning Protocol (EPP) Host Mapping

Status of this Memo

 This document specifies an Internet standards track protocol for the
 Internet community, and requests discussion and suggestions for
 improvements.  Please refer to the current edition of the "Internet
 Official Protocol Standards" (STD 1) for the standardization state
 and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

 Copyright (C) The Internet Society (2004).  All Rights Reserved.

Abstract

 This document describes an Extensible Provisioning Protocol (EPP)
 mapping for the provisioning and management of Internet host names
 stored in a shared central repository.  Specified in XML, the mapping
 defines EPP command syntax and semantics as applied to host names.

Table of Contents

 1.  Introduction. . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Relationship of Host Objects and Domain Objects . . . .   2
     1.2.  Conventions Used In This Document . . . . . . . . . . .   3
 2.  Object Attributes . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Host Names. . . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Client Identifiers. . . . . . . . . . . . . . . . . . .   3
     2.3.  Status Values . . . . . . . . . . . . . . . . . . . . .   3
     2.4.  Dates and Times . . . . . . . . . . . . . . . . . . . .   5
     2.5.  IP Addresses. . . . . . . . . . . . . . . . . . . . . .   5
 3. EPP Command Mapping. . . . . . . . . . . . . . . . . . . . . .   6
     3.1.  EPP Query Commands. . . . . . . . . . . . . . . . . . .   6
           3.1.1.  EPP <check> Command . . . . . . . . . . . . . .   6
           3.1.2.  EPP <info> Command. . . . . . . . . . . . . . .   8
           3.1.3.  EPP <transfer> Query Command. . . . . . . . . .  10
     3.2.  EPP Transform Commands. . . . . . . . . . . . . . . . .  11
           3.2.1.  EPP <create> Command. . . . . . . . . . . . . .  11
           3.2.2.  EPP <delete> Command. . . . . . . . . . . . . .  13
           3.2.3.  EPP <renew> Command . . . . . . . . . . . . . .  14
           3.2.4.  EPP <transfer> Command. . . . . . . . . . . . .  14
           3.2.5.  EPP <update> Command. . . . . . . . . . . . . .  15

Hollenbeck Standards Track [Page 1] RFC 3732 EPP Host Mapping March 2004

           3.2.6.  Offline Review of Requested Actions . . . . . .  17
 4.  Formal Syntax . . . . . . . . . . . . . . . . . . . . . . . .  19
 5.  Internationalization Considerations . . . . . . . . . . . . .  24
 6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  25
 7.  Security Considerations . . . . . . . . . . . . . . . . . . .  25
 8.  Acknowledgements. . . . . . . . . . . . . . . . . . . . . . .  25
 9.  References. . . . . . . . . . . . . . . . . . . . . . . . . .  26
     9.1.  Normative References. . . . . . . . . . . . . . . . . .  26
     9.2.  Informative References. . . . . . . . . . . . . . . . .  27
 10. Author's Address. . . . . . . . . . . . . . . . . . . . . . .  27
 11. Full Copyright Statement. . . . . . . . . . . . . . . . . . .  28

1. Introduction

 This document describes an Internet host name mapping for version 1.0
 of the Extensible Provisioning Protocol (EPP).  This mapping is
 specified using the Extensible Markup Language (XML) 1.0 as described
 in [XML] and XML Schema notation as described in [XMLS-1] and [XMLS-
 2].
 [RFC3730] provides a complete description of EPP command and response
 structures.  A thorough understanding of the base protocol
 specification is necessary to understand the mapping described in
 this document.
 XML is case sensitive.  Unless stated otherwise, XML specifications
 and examples provided in this document MUST be interpreted in the
 character case presented to develop a conforming implementation.

1.1. Relationship of Host Objects and Domain Objects

 This document assumes that host name objects have a subordinate
 relationship to a superordinate domain name object.  For example,
 host name "ns1.example.com" has a subordinate relationship to domain
 name "example.com".  EPP actions (such as object transfers) that do
 not preserve this relationship MUST be explicitly disallowed.
 A host name object can be created in a repository for which no
 superordinate domain name object exists.  For example, host name
 "ns1.example.com" can be created in the ".example" repository so that
 DNS domains in ".example" can be delegated to the host.  Such hosts
 are described as "external" hosts in this specification since the
 name of the host does not belong to the name space of the repository
 in which the host is being used for delegation purposes.
 Whether a host is external or internal relates to the repository in
 which the host is being used for delegation purposes.  Whether an
 internal host is subordinate or not relates to a domain within the

Hollenbeck Standards Track [Page 2] RFC 3732 EPP Host Mapping March 2004

 repository.  For example, host ns1.example1.com is a subordinate host
 of domain example1.com, but it is a not a subordinate host of domain
 example2.com.  ns1.example1.com can be used as a name server for
 example2.com.  In this case, ns1.example1.com MUST be treated as an
 internal host, subject to the rules governing operations on
 subordinate hosts within the same repository.

1.2. Conventions Used In This Document

 The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
 "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
 document are to be interpreted as described in [RFC2119].
 In examples, "C:" represents lines sent by a protocol client and "S:"
 represents lines returned by a protocol server.  Indentation and
 white space in examples is provided only to illustrate element
 relationships and is not a REQUIRED feature of this protocol.

2. Object Attributes

 An EPP host object has attributes and associated values that can be
 viewed and modified by the sponsoring client or the server.  This
 section describes each attribute type in detail.  The formal syntax
 for the attribute values described here can be found in the "Formal
 Syntax" section of this document and in the appropriate normative
 references.

2.1. Host Names

 The syntax for host names described in this document MUST conform to
 [RFC952] as updated by [RFC1123].  At the time of this writing, RFC
 3490 [RFC3490] describes a standard to use certain ASCII name labels
 to represent non-ASCII name labels.  These conformance requirements
 might change in the future as a result of progressing work in
 developing standards for internationalized host names.

2.2. Client Identifiers

 All EPP clients are identified by a server-unique identifier.  Client
 identifiers conform to the "clIDType" syntax described in [RFC3730].

2.3. Status Values

 A host object MUST always have at least one associated status value.
 Status values MAY be set only by the client that sponsors a host
 object and by the server on which the object resides.  A client can
 change the status of a host object using the EPP <update> command.
 Each status value MAY be accompanied by a string of human-readable

Hollenbeck Standards Track [Page 3] RFC 3732 EPP Host Mapping March 2004

 text that describes the rationale for the status applied to the
 object.
 A client MUST NOT alter status values set by the server.  A server
 MAY alter or override status values set by a client subject to local
 server policies.  The status of an object MAY change as a result of
 either a client-initiated transform command or an action performed by
 a server operator.
 Status values that can be added or removed by a client are prefixed
 with "client".  Corresponding status values that can be added or
 removed by a server are prefixed with "server".  Status values that
 do not begin with either "client" or "server" are server-managed.
 Status Value Descriptions:
  1. clientDeleteProhibited, serverDeleteProhibited
 Requests to delete the object MUST be rejected.
  1. clientUpdateProhibited, serverUpdateProhibited
 Requests to update the object (other than to remove this status) MUST
 be rejected.
  1. linked
 The host object has at least one active association with another
 object, such as a domain object.  Servers SHOULD provide services to
 determine existing object associations.
  1. ok
 This is the normal status value for an object that has no pending
 operations or prohibitions.  This value is set and removed by the
 server as other status values are added or removed.
  1. pendingCreate, pendingDelete, pendingTransfer, pendingUpdate
 A transform command has been processed for the object (or in the case
 of a <transfer> command, for the host object's superordinate domain
 object), but the action has not been completed by the server.  Server
 operators can delay action completion for a variety of reasons, such
 as to allow for human review or third-party action.  A transform
 command that is processed, but whose requested action is pending, is
 noted with response code 1001.

Hollenbeck Standards Track [Page 4] RFC 3732 EPP Host Mapping March 2004

 Transform commands MUST be rejected when a pendingCreate,
 pendingDelete, pendingTransfer, or pendingUpdate status is set.
 When the requested action has been completed, the pendingCreate,
 pendingDelete, pendingTransfer, or pendingUpdate status value MUST be
 removed.  All clients involved in the transaction MUST be notified
 using a service message that the action has been completed and that
 the status of the object has changed.
 "ok" status MAY only be combined with "linked" status.
 "linked" status MAY be combined with any status.
 "pendingDelete" status MUST NOT be combined with either
 "clientDeleteProhibited" or "serverDeleteProhibited" status.
 "pendingUpdate" status MUST NOT be combined with either
 "clientUpdateProhibited" or "serverUpdateProhibited" status.
 The pendingCreate, pendingDelete, pendingTransfer, and pendingUpdate
 status values MUST NOT be combined with each other.
 Other status combinations not expressly prohibited MAY be used.

2.4. Dates and Times

 Date and time attribute values MUST be represented in Universal
 Coordinated Time (UTC) using the Gregorian calendar.  The extended
 date-time form using upper case "T" and "Z" characters defined in
 [RFC3339] MUST be used to represent date-time values as XML Schema
 does not support truncated date-time forms or lower case "T" and "Z"
 characters.

2.5. IP Addresses

 The syntax for IPv4 addresses described in this document MUST conform
 to [RFC791].  The syntax for IPv6 addresses described in this
 document MUST conform to [RFC3513].  Practical considerations for
 publishing IPv6 address information in zone files are documented in
 [RFC1886], [RFC2874], and [RFC3152].  A server MAY reject IP
 addresses that have not been allocated for public use by IANA.  When
 a host object is provisioned for use as a DNS name server, IP
 addresses SHOULD be required only as needed to generate DNS glue
 records.

Hollenbeck Standards Track [Page 5] RFC 3732 EPP Host Mapping March 2004

3. EPP Command Mapping

 A detailed description of the EPP syntax and semantics can be found
 in [RFC3730].  The command mappings described here are specifically
 for use in provisioning and managing Internet host names via EPP.

3.1. EPP Query Commands

 EPP provides two commands to retrieve host information: <check> to
 determine if a host object can be provisioned within a repository,
 and <info> to retrieve detailed information associated with a host
 object.

3.1.1. EPP <check> Command

 The EPP <check> command is used to determine if an object can be
 provisioned within a repository.  It provides a hint that allows a
 client to anticipate the success or failure of provisioning an object
 using the <create> command as object provisioning requirements are
 ultimately a matter of server policy.
 In addition to the standard EPP command elements, the <check> command
 MUST contain a <host:check> element that identifies the host
 namespace and the location of the host schema.  The <host:check>
 element contains the following child elements:
  1. One or more <host:name> elements that contain the fully qualified

names of the host objects to be queried.

 Example <check> command:
 C:<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 C:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0"
 C:     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 C:     xsi:schemaLocation="urn:ietf:params:xml:ns:epp-1.0
 C:     epp-1.0.xsd">
 C:  <command>
 C:    <check>
 C:      <host:check
 C:       xmlns:host="urn:ietf:params:xml:ns:host-1.0"
 C:       xsi:schemaLocation="urn:ietf:params:xml:ns:host-1.0
 C:       host-1.0.xsd">
 C:        <host:name>ns1.example.com</host:name>
 C:        <host:name>ns2.example.com</host:name>
 C:        <host:name>ns3.example.com</host:name>
 C:      </host:check>
 C:    </check>
 C:    <clTRID>ABC-12345</clTRID>

Hollenbeck Standards Track [Page 6] RFC 3732 EPP Host Mapping March 2004

 C:  </command>
 C:</epp>
 When a <check> command has been processed successfully, the EPP
 <resData> element MUST contain a child <host:chkData> element that
 identifies the host namespace and the location of the host schema.
 The <host:chkData> element contains one or more <host:cd> elements
 that contain the following child elements:
  1. A <host:name> element that contains the fully qualified name of

the queried host object. This element MUST contain an "avail"

    attribute whose value indicates object availability (can it be
    provisioned or not) at the moment the <check> command was
    completed.  A value of "1" or "true" means that the object can be
    provisioned.  A value of "0" or "false" means that the object can
    not be provisioned.
  1. An OPTIONAL <host:reason> element that MAY be provided when an

object can not be provisioned. If present, this element contains

    server-specific text to help explain why the object can not be
    provisioned.  This text MUST be represented in the response
    language previously negotiated with the client; an OPTIONAL "lang"
    attribute MAY be present to identify the language if the
    negotiated value is something other than the default value of "en"
    (English).
 Example <check> response:
 S:<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 S:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0"
 S:     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 S:     xsi:schemaLocation="urn:ietf:params:xml:ns:epp-1.0
 S:     epp-1.0.xsd">
 S:  <response>
 S:    <result code="1000">
 S:      <msg>Command completed successfully</msg>
 S:    </result>
 S:    <resData>
 S:      <host:chkData
 S:       xmlns:host="urn:ietf:params:xml:ns:host-1.0"
 S:       xsi:schemaLocation="urn:ietf:params:xml:ns:host-1.0
 S:       host-1.0.xsd">
 S:        <host:cd>
 S:          <host:name avail="1">ns1.example.com</host:name>
 S:        </host:cd>
 S:        <host:cd>
 S:          <host:name avail="0">ns2.example2.com</host:name>
 S:          <host:reason>In use</host:reason>

Hollenbeck Standards Track [Page 7] RFC 3732 EPP Host Mapping March 2004

 S:        </host:cd>
 S:        <host:cd>
 S:          <host:name avail="1">ns3.example3.com</host:name>
 S:        </host:cd>
 S:      </host:chkData>
 S:    </resData>
 S:    <trID>
 S:      <clTRID>ABC-12345</clTRID>
 S:      <svTRID>54322-XYZ</svTRID>
 S:    </trID>
 S:  </response>
 S:</epp>
 An EPP error response MUST be returned if a <check> command can not
 be processed for any reason.

3.1.2. EPP <info> Command

 The EPP <info> command is used to retrieve information associated
 with a host object.  In addition to the standard EPP command
 elements, the <info> command MUST contain a <host:info> element that
 identifies the host namespace and the location of the host schema.
 The <host:info> element contains the following child elements:
  1. A <host:name> element that contains the fully qualified name of

the host object for which information is requested.

 Example <info> command:
 C:<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 C:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0"
 C:     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 C:     xsi:schemaLocation="urn:ietf:params:xml:ns:epp-1.0
 C:     epp-1.0.xsd">
 C:  <command>
 C:    <info>
 C:      <host:info
 C:       xmlns:host="urn:ietf:params:xml:ns:host-1.0"
 C:       xsi:schemaLocation="urn:ietf:params:xml:ns:host-1.0
 C:       host-1.0.xsd">
 C:        <host:name>ns1.example.com</host:name>
 C:      </host:info>
 C:    </info>
 C:    <clTRID>ABC-12345</clTRID>
 C:  </command>
 C:</epp>

Hollenbeck Standards Track [Page 8] RFC 3732 EPP Host Mapping March 2004

 When an <info> command has been processed successfully, the EPP
 <resData> element MUST contain a child <host:infData> element that
 identifies the host namespace and the location of the host schema.
 The <host:infData> element contains the following child elements:
  1. A <host:name> element that contains the fully qualified name of

the host object.

  1. A <host:roid> element that contains the Repository Object

IDentifier assigned to the host object when the object was

    created.
  1. One or more <host:status> elements that describe the status of the

host object.

  1. Zero or more <host:addr> elements that contain the IP addresses

associated with the host object.

  1. A <host:clID> element that contains the identifier of the

sponsoring client.

  1. A <host:crID> element that contains the identifier of the client

that created the host object.

  1. A <host:crDate> element that contains the date and time of host

object creation.

  1. A <host:upID> element that contains the identifier of the client

that last updated the host object. This element MUST NOT be

    present if the host object has never been modified.
  1. A <host:upDate> element that contains the date and time of the

most recent host object modification. This element MUST NOT be

    present if the host object has never been modified.
  1. A <host:trDate> element that contains the date and time of the

most recent successful host object transfer. This element MUST

    NOT be provided if the host object has never been transferred.
    Note that host objects MUST NOT be transferred directly; host
    objects MUST be transferred implicitly when the host object's
    superordinate domain object is transferred.  Host objects that are
    subject to transfer when transferring a domain object are listed
    in the response to an EPP <info> command performed on the domain
    object.

Hollenbeck Standards Track [Page 9] RFC 3732 EPP Host Mapping March 2004

 Example <info> response:
 S:<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 S:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0"
 S:     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 S:     xsi:schemaLocation="urn:ietf:params:xml:ns:epp-1.0
 S:     epp-1.0.xsd">
 S:  <response>
 S:    <result code="1000">
 S:      <msg>Command completed successfully</msg>
 S:    </result>
 S:    <resData>
 S:      <host:infData
 S:       xmlns:host="urn:ietf:params:xml:ns:host-1.0"
 S:       xsi:schemaLocation="urn:ietf:params:xml:ns:host-1.0
 S:       host-1.0.xsd">
 S:        <host:name>ns1.example.com</host:name>
 S:        <host:roid>NS1_EXAMPLE1-REP</host:roid>
 S:        <host:status s="linked"/>
 S:        <host:status s="clientUpdateProhibited"/>
 S:        <host:addr ip="v4">192.0.2.2</host:addr>
 S:        <host:addr ip="v4">192.0.2.29</host:addr>
 S:        <host:addr ip="v6">1080:0:0:0:8:800:200C:417A</host:addr>
 S:        <host:clID>ClientY</host:clID>
 S:        <host:crID>ClientX</host:crID>
 S:        <host:crDate>1999-04-03T22:00:00.0Z</host:crDate>
 S:        <host:upID>ClientX</host:upID>
 S:        <host:upDate>1999-12-03T09:00:00.0Z</host:upDate>
 S:        <host:trDate>2000-04-08T09:00:00.0Z</host:trDate>
 S:      </host:infData>
 S:    </resData>
 S:    <trID>
 S:      <clTRID>ABC-12345</clTRID>
 S:      <svTRID>54322-XYZ</svTRID>
 S:    </trID>
 S:  </response>
 S:</epp>
 An EPP error response MUST be returned if an <info> command can not
 be processed for any reason.

3.1.3. EPP <transfer> Query Command

 Transfer semantics do not directly apply to host objects, so there is
 no mapping defined for the EPP <transfer> query command.

Hollenbeck Standards Track [Page 10] RFC 3732 EPP Host Mapping March 2004

3.2. EPP Transform Commands

 EPP provides three commands to transform host objects: <create> to
 create an instance of a host object, <delete> to delete an instance
 of a host object, and <update> to change information associated with
 a host object.  This document does not define host object mappings
 for the EPP <renew> and <transfer> commands.
 Transform commands are typically processed and completed in real
 time.  Server operators MAY receive and process transform commands,
 but defer completing the requested action if human or third-party
 review is required before the requested action can be completed.  In
 such situations the server MUST return a 1001 response code to the
 client to note that the command has been received and processed, but
 the requested action is pending.  The server MUST also manage the
 status of the object that is the subject of the command to reflect
 the initiation and completion of the requested action.  Once the
 action has been completed, all clients involved in the transaction
 MUST be notified using a service message that the action has been
 completed and that the status of the object has changed.

3.2.1. EPP <create> Command

 The EPP <create> command provides a transform operation that allows a
 client to create a host object.  In addition to the standard EPP
 command elements, the <create> command MUST contain a <host:create>
 element that identifies the host namespace and the location of the
 host schema.  The <host:create> element contains the following child
 elements:
  1. A <host:name> element that contains the fully qualified name of

the host object to be created.

  1. Zero or more <host:addr> elements that contain the IP addresses to

be associated with the host. Each element MAY contain an "ip"

    attribute to identify the IP address format.  Attribute value "v4"
    is used to note IPv4 address format.  Attribute value "v6" is used
    to note IPv6 address format.  If the "ip" attribute is not
    specified, "v4" is the default attribute value.
 Hosts can be provisioned for use as name servers in the Domain Name
 System (DNS), described in [RFC1034] and [RFC1035].  Hosts
 provisioned as name servers might be subject to server operator
 policies that require or prohibit specification of IP addresses
 depending on the name of the host and the name space in which the
 server will be used as a name server.  When provisioned for use as a
 name server, IP addresses are REQUIRED only as needed to produce DNS
 glue records.  For example, if the server is authoritative for the

Hollenbeck Standards Track [Page 11] RFC 3732 EPP Host Mapping March 2004

 "com" name space and the name of the server is "ns1.example.net", the
 server is not required to produce DNS glue records for the name
 server and IP addresses for the server are not required by the DNS.
 If the host name exists in a name space for which the server is
 authoritative, then the superordinate domain of the host MUST be
 known to the server before the host object can be created.
 Example <create> command:
 C:<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 C:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0"
 C:     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 C:     xsi:schemaLocation="urn:ietf:params:xml:ns:epp-1.0
 C:     epp-1.0.xsd">
 C:  <command>
 C:    <create>
 C:      <host:create
 C:       xmlns:host="urn:ietf:params:xml:ns:host-1.0"
 C:       xsi:schemaLocation="urn:ietf:params:xml:ns:host-1.0
 C:       host-1.0.xsd">
 C:        <host:name>ns1.example.com</host:name>
 C:        <host:addr ip="v4">192.0.2.2</host:addr>
 C:        <host:addr ip="v4">192.0.2.29</host:addr>
 C:        <host:addr ip="v6">1080:0:0:0:8:800:200C:417A</host:addr>
 C:      </host:create>
 C:    </create>
 C:    <clTRID>ABC-12345</clTRID>
 C:  </command>
 C:</epp>
 When a <create> command has been processed successfully, the EPP
 <resData> element MUST contain a child <host:creData> element that
 identifies the host namespace and the location of the host schema.
 The <host:creData> element contains the following child elements:
  1. A <host:name> element that contains the fully qualified name of

the host object.

  1. A <host:crDate> element that contains the date and time of host

object creation.

 Example <create> response:
 S:<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 S:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0"
 S:     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 S:     xsi:schemaLocation="urn:ietf:params:xml:ns:epp-1.0

Hollenbeck Standards Track [Page 12] RFC 3732 EPP Host Mapping March 2004

 S:     epp-1.0.xsd">
 S:  <response>
 S:    <result code="1000">
 S:      <msg>Command completed successfully</msg>
 S:    </result>
 S:    <resData>
 S:      <host:creData
 S:       xmlns:host="urn:ietf:params:xml:ns:host-1.0"
 S:       xsi:schemaLocation="urn:ietf:params:xml:ns:host-1.0
 S:       host-1.0.xsd">
 S:        <host:name>ns1.example.com</host:name>
 S:        <host:crDate>1999-04-03T22:00:00.0Z</host:crDate>
 S:      </host:creData>
 S:    </resData>
 S:    <trID>
 S:      <clTRID>ABC-12345</clTRID>
 S:      <svTRID>54322-XYZ</svTRID>
 S:    </trID>
 S:  </response>
 S:</epp>
 An EPP error response MUST be returned if a <create> command can not
 be processed for any reason.

3.2.2. EPP <delete> Command

 The EPP <delete> command provides a transform operation that allows a
 client to delete a host object.  In addition to the standard EPP
 command elements, the <delete> command MUST contain a <host:delete>
 element that identifies the host namespace and the location of the
 host schema.  The <host:delete> element contains the following child
 elements:
  1. A <host:name> element that contains the fully qualified name of

the host object to be deleted.

 A host name object MUST NOT be deleted if the host object is
 associated with any other object.  For example, if the host object is
 associated with a domain object, the host object MUST NOT be deleted
 until the existing association has been broken.
 Example <delete> command:
 C:<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 C:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0"
 C:     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 C:     xsi:schemaLocation="urn:ietf:params:xml:ns:epp-1.0
 C:     epp-1.0.xsd">

Hollenbeck Standards Track [Page 13] RFC 3732 EPP Host Mapping March 2004

 C:  <command>
 C:    <delete>
 C:      <host:delete
 C:       xmlns:host="urn:ietf:params:xml:ns:host-1.0"
 C:       xsi:schemaLocation="urn:ietf:params:xml:ns:host-1.0
 C:       host-1.0.xsd">
 C:        <host:name>ns1.example.com</host:name>
 C:      </host:delete>
 C:    </delete>
 C:    <clTRID>ABC-12345</clTRID>
 C:  </command>
 C:</epp>
 When a <delete> command has been processed successfully, a server
 MUST respond with an EPP response with no <resData> element.
 Example <delete> response:
 S:<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 S:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0"
 S:     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 S:     xsi:schemaLocation="urn:ietf:params:xml:ns:epp-1.0
 S:     epp-1.0.xsd">
 S:  <response>
 S:    <result code="1000">
 S:      <msg>Command completed successfully</msg>
 S:    </result>
 S:    <trID>
 S:      <clTRID>ABC-12345</clTRID>
 S:      <svTRID>54321-XYZ</svTRID>
 S:    </trID>
 S:  </response>
 S:</epp>
 An EPP error response MUST be returned if a <delete> command can not
 be processed for any reason.

3.2.3. EPP <renew> Command

 Renewal semantics do not apply to host objects, so there is no
 mapping defined for the EPP <renew> command.

3.2.4. EPP <transfer> Command

 Transfer semantics do not directly apply to host objects, so there is
 no mapping defined for the EPP <transfer> command.  Host objects are
 subordinate to an existing superordinate domain object, and as such
 they are subject to transfer when a domain object is transferred.

Hollenbeck Standards Track [Page 14] RFC 3732 EPP Host Mapping March 2004

3.2.5. EPP <update> Command

 The EPP <update> command provides a transform operation that allows a
 client to modify the attributes of a host object.  In addition to the
 standard EPP command elements, the <update> command MUST contain a
 <host:update> element that identifies the host namespace and the
 location of the host schema.  The <host:update> element contains the
 following child elements:
  1. A <host:name> element that contains the fully qualified name of

the host object to be updated.

  1. An OPTIONAL <host:add> element that contains attribute values to

be added to the object.

  1. An OPTIONAL <host:rem> element that contains attribute values to

be removed from the object.

  1. An OPTIONAL <host:chg> element that contains object attribute

values to be changed.

 At least one <host:add>, <host:rem>, or <host:chg> element MUST be
 provided.  The <host:add> and <host:rem> elements contain the
 following child elements:
  1. One or more <host:addr> elements that contain IP addresses to be

associated with or removed from the host object. IP address

    restrictions described in the <create> command mapping apply here
    as well.
  1. One or more <host:status> elements that contain status values to

be associated with or removed from the object. When specifying a

    value to be removed, only the attribute value is significant;
    element text is not required to match a value for removal.
 A <host:chg> element contains the following child elements:
  1. A <host:name> element that contains a new fully qualified host

name by which the host object will be known.

 Host name changes MAY require the addition or removal of IP addresses
 to be accepted by the server.  IP address association MAY be subject
 to server policies for provisioning hosts as name servers.
 Host name changes can have an impact on associated objects that refer
 to the host object.  A host name change SHOULD NOT require additional
 updates of associated objects to preserve existing associations, with
 one exception:  changing an external host object that has

Hollenbeck Standards Track [Page 15] RFC 3732 EPP Host Mapping March 2004

 associations with objects that are sponsored by a different client.
 Attempts to update such hosts directly MUST fail with EPP error code
 2305.  The change can be provisioned by creating a new external host
 with a new name and needed new attributes and subsequently updating
 the other objects sponsored by the client.
 Example <update> command:
 C:<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 C:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0"
 C:     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 C:     xsi:schemaLocation="urn:ietf:params:xml:ns:epp-1.0
 C:     epp-1.0.xsd">
 C:  <command>
 C:    <update>
 C:      <host:update
 C:       xmlns:host="urn:ietf:params:xml:ns:host-1.0"
 C:       xsi:schemaLocation="urn:ietf:params:xml:ns:host-1.0
 C:       host-1.0.xsd">
 C:        <host:name>ns1.example.com</host:name>
 C:        <host:add>
 C:          <host:addr ip="v4">192.0.2.22</host:addr>
 C:          <host:status s="clientUpdateProhibited"/>
 C:        </host:add>
 C:        <host:rem>
 C:          <host:addr ip="v6">1080:0:0:0:8:800:200C:417A</host:addr>
 C:        </host:rem>
 C:        <host:chg>
 C:          <host:name>ns2.example.com</host:name>
 C:        </host:chg>
 C:      </host:update>
 C:    </update>
 C:    <clTRID>ABC-12345</clTRID>
 C:  </command>
 C:</epp>
 When an <update> command has been processed successfully, a server
 MUST respond with an EPP response with no <resData> element.
 Example <update> response:
 S:<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 S:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0"
 S:     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 S:     xsi:schemaLocation="urn:ietf:params:xml:ns:epp-1.0
 S:     epp-1.0.xsd">
 S:  <response>
 S:    <result code="1000">

Hollenbeck Standards Track [Page 16] RFC 3732 EPP Host Mapping March 2004

 S:      <msg>Command completed successfully</msg>
 S:    </result>
 S:    <trID>
 S:      <clTRID>ABC-12345</clTRID>
 S:      <svTRID>54321-XYZ</svTRID>
 S:    </trID>
 S:  </response>
 S:</epp>
 An EPP error response MUST be returned if an <update> command could
 not be processed for any reason.

3.2.6. Offline Review of Requested Actions

 Commands are processed by a server in the order they are received
 from a client.  Though an immediate response confirming receipt and
 processing of the command is produced by the server, a server
 operator MAY perform an offline review of requested transform
 commands before completing the requested action.  In such situations
 the response from the server MUST clearly note that the transform
 command has been received and processed, but the requested action is
 pending.  The status of the corresponding object MUST clearly reflect
 processing of the pending action.  The server MUST notify the client
 when offline processing of the action has been completed.
 Examples describing a <create> command that requires offline review
 are included here.  Note the result code and message returned in
 response to the <create> command.
 S:<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 S:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0"
 S:     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 S:     xsi:schemaLocation="urn:ietf:params:xml:ns:epp-1.0
 S:     epp-1.0.xsd">
 S:  <response>
 S:    <result code="1001">
 S:      <msg>Command completed successfully; action pending</msg>
 S:    </result>
 S:    <resData>
 S:      <host:creData
 S:       xmlns:host="urn:ietf:params:xml:ns:host-1.0"
 S:       xsi:schemaLocation="urn:ietf:params:xml:ns:host-1.0
 S:       host-1.0.xsd">
 S:        <host:name>ns1.example.com</host:name>
 S:        <host:crDate>1999-04-03T22:00:00.0Z</host:crDate>
 S:      </host:creData>
 S:    </resData>
 S:    <trID>

Hollenbeck Standards Track [Page 17] RFC 3732 EPP Host Mapping March 2004

 S:      <clTRID>ABC-12345</clTRID>
 S:      <svTRID>54322-XYZ</svTRID>
 S:    </trID>
 S:  </response>
 S:</epp>
 The status of the host object after returning this response MUST
 include "pendingCreate".  The server operator reviews the request
 offline, and informs the client of the outcome of the review by
 queuing a service message for retrieval via the <poll> command.
 The service message MUST contain text in the <response>, <msgQ>,
 <msg> element that describes the notification.  In addition, the EPP
 <resData> element MUST contain a child <host:panData> element that
 identifies the host namespace and the location of the host schema.
 The <host:panData> element contains the following child elements:
  1. A <host:name> element that contains the fully qualified name of

the host object. The <host:name> element contains a REQUIRED

    "paResult" attribute.  A positive boolean value indicates that the
    request has been approved and completed.  A negative boolean value
    indicates that the request has been denied and the requested
    action has not been taken.
  1. A <host:paTRID> element that contains the client transaction

identifier and server transaction identifier returned with the

    original response to process the command.  The client transaction
    identifier is OPTIONAL and will only be returned if the client
    provided an identifier with the original <create> command.
  1. A <host:paDate> element that contains the date and time describing

when review of the requested action was completed.

 Example "review completed" service message:
 S:<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 S:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0"
 S:     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 S:     xsi:schemaLocation="urn:ietf:params:xml:ns:epp-1.0
 S:     epp-1.0.xsd">
 S:  <response>
 S:    <result code="1301">
 S:      <msg>Command completed successfully; ack to dequeue</msg>
 S:    </result>
 S:    <msgQ count="5" id="12345">
 S:      <qDate>1999-04-04T22:01:00.0Z</qDate>
 S:      <msg>Pending action completed successfully.</msg>
 S:    </msgQ>

Hollenbeck Standards Track [Page 18] RFC 3732 EPP Host Mapping March 2004

 S:    <resData>
 S:      <host:panData
 S:       xmlns:host="urn:ietf:params:xml:ns:host-1.0"
 S:       xsi:schemaLocation="urn:ietf:params:xml:ns:host-1.0
 S:       host-1.0.xsd">
 S:        <host:name paResult="1">ns1.example.com</host:name>
 S:        <host:paTRID>
 S:          <clTRID>ABC-12345</clTRID>
 S:          <svTRID>54322-XYZ</svTRID>
 S:        </host:paTRID>
 S:        <host:paDate>1999-04-04T22:00:00.0Z</host:paDate>
 S:      </host:panData>
 S:    </resData>
 S:    <trID>
 S:      <clTRID>BCD-23456</clTRID>
 S:      <svTRID>65432-WXY</svTRID>
 S:    </trID>
 S:  </response>
 S:</epp>

4. Formal Syntax

 An EPP object mapping is specified in XML Schema notation.  The
 formal syntax presented here is a complete schema representation of
 the object mapping suitable for automated validation of EPP XML
 instances.  The BEGIN and END tags are not part of the schema; they
 are used to note the beginning and ending of the schema for URI
 registration purposes.
 BEGIN
 <?xml version="1.0" encoding="UTF-8"?>
 <schema targetNamespace="urn:ietf:params:xml:ns:host-1.0"
         xmlns:host="urn:ietf:params:xml:ns:host-1.0"
         xmlns:epp="urn:ietf:params:xml:ns:epp-1.0"
         xmlns:eppcom="urn:ietf:params:xml:ns:eppcom-1.0"
         xmlns="http://www.w3.org/2001/XMLSchema"
         elementFormDefault="qualified">
 <!--
 Import common element types.
 -->
   <import namespace="urn:ietf:params:xml:ns:eppcom-1.0"
           schemaLocation="eppcom-1.0.xsd"/>
   <import namespace="urn:ietf:params:xml:ns:epp-1.0"
           schemaLocation="epp-1.0.xsd"/>
   <annotation>

Hollenbeck Standards Track [Page 19] RFC 3732 EPP Host Mapping March 2004

     <documentation>
       Extensible Provisioning Protocol v1.0
       host provisioning schema.
     </documentation>
   </annotation>
 <!--
 Child elements found in EPP commands.
 -->
   <element name="check" type="host:mNameType"/>
   <element name="create" type="host:createType"/>
   <element name="delete" type="host:sNameType"/>
   <element name="info" type="host:sNameType"/>
   <element name="update" type="host:updateType"/>
 <!--
 Child elements of the <create> command.
 -->
   <complexType name="createType">
     <sequence>
       <element name="name" type="eppcom:labelType"/>
       <element name="addr" type="host:addrType"
        minOccurs="0" maxOccurs="unbounded"/>
     </sequence>
   </complexType>
   <complexType name="addrType">
     <simpleContent>
       <extension base="host:addrStringType">
         <attribute name="ip" type="host:ipType"
          default="v4"/>
       </extension>
     </simpleContent>
   </complexType>
   <simpleType name="addrStringType">
     <restriction base="token">
       <minLength value="3"/>
       <maxLength value="45"/>
     </restriction>
   </simpleType>
   <simpleType name="ipType">
     <restriction base="token">
       <enumeration value="v4"/>
       <enumeration value="v6"/>
     </restriction>
   </simpleType>

Hollenbeck Standards Track [Page 20] RFC 3732 EPP Host Mapping March 2004

 <!--
 Child elements of the <delete> and <info> commands.
 -->
   <complexType name="sNameType">
     <sequence>
       <element name="name" type="eppcom:labelType"/>
     </sequence>
   </complexType>
 <!--
 Child element of commands that accept multiple names.
 -->
   <complexType name="mNameType">
     <sequence>
       <element name="name" type="eppcom:labelType"
        maxOccurs="unbounded"/>
     </sequence>
   </complexType>
 <!--
 Child elements of the <update> command.
 -->
   <complexType name="updateType">
     <sequence>
       <element name="name" type="eppcom:labelType"/>
       <element name="add" type="host:addRemType"
        minOccurs="0"/>
       <element name="rem" type="host:addRemType"
        minOccurs="0"/>
       <element name="chg" type="host:chgType"
        minOccurs="0"/>
     </sequence>
   </complexType>
 <!--
 Data elements that can be added or removed.
 -->
   <complexType name="addRemType">
     <sequence>
       <element name="addr" type="host:addrType"
        minOccurs="0" maxOccurs="unbounded"/>
       <element name="status" type="host:statusType"
        minOccurs="0" maxOccurs="7"/>
     </sequence>
   </complexType>
 <!--
 Data elements that can be changed.
 -->

Hollenbeck Standards Track [Page 21] RFC 3732 EPP Host Mapping March 2004

   <complexType name="chgType">
     <sequence>
       <element name="name" type="eppcom:labelType"/>
     </sequence>
   </complexType>
 <!--
 Child response elements.
 -->
   <element name="chkData" type="host:chkDataType"/>
   <element name="creData" type="host:creDataType"/>
   <element name="infData" type="host:infDataType"/>
   <element name="panData" type="host:panDataType"/>
 <!--
 <check> response elements.
 -->
   <complexType name="chkDataType">
     <sequence>
       <element name="cd" type="host:checkType"
        maxOccurs="unbounded"/>
     </sequence>
   </complexType>
   <complexType name="checkType">
     <sequence>
       <element name="name" type="host:checkNameType"/>
       <element name="reason" type="eppcom:reasonType"
        minOccurs="0"/>
     </sequence>
   </complexType>
   <complexType name="checkNameType">
     <simpleContent>
       <extension base="eppcom:labelType">
         <attribute name="avail" type="boolean"
          use="required"/>
       </extension>
     </simpleContent>
   </complexType>
 <!--
 <create> response elements.
 -->
   <complexType name="creDataType">
     <sequence>
       <element name="name" type="eppcom:labelType"/>
       <element name="crDate" type="dateTime"/>

Hollenbeck Standards Track [Page 22] RFC 3732 EPP Host Mapping March 2004

     </sequence>
   </complexType>
 <!--
 <info> response elements.
 -->
   <complexType name="infDataType">
     <sequence>
       <element name="name" type="eppcom:labelType"/>
       <element name="roid" type="eppcom:roidType"/>
       <element name="status" type="host:statusType"
        maxOccurs="7"/>
       <element name="addr" type="host:addrType"
        minOccurs="0" maxOccurs="unbounded"/>
       <element name="clID" type="eppcom:clIDType"/>
       <element name="crID" type="eppcom:clIDType"/>
       <element name="crDate" type="dateTime"/>
       <element name="upID" type="eppcom:clIDType"
        minOccurs="0"/>
       <element name="upDate" type="dateTime"
        minOccurs="0"/>
       <element name="trDate" type="dateTime"
        minOccurs="0"/>
     </sequence>
   </complexType>
 <!--
 Status is a combination of attributes and an optional human-readable
 message that may be expressed in languages other than English.
 -->
   <complexType name="statusType">
     <simpleContent>
       <extension base="normalizedString">
         <attribute name="s" type="host:statusValueType"
          use="required"/>
         <attribute name="lang" type="language"
          default="en"/>
       </extension>
     </simpleContent>
   </complexType>
   <simpleType name="statusValueType">
     <restriction base="token">
       <enumeration value="clientDeleteProhibited"/>
       <enumeration value="clientUpdateProhibited"/>
       <enumeration value="linked"/>
       <enumeration value="ok"/>
       <enumeration value="pendingCreate"/>

Hollenbeck Standards Track [Page 23] RFC 3732 EPP Host Mapping March 2004

       <enumeration value="pendingDelete"/>
       <enumeration value="pendingTransfer"/>
       <enumeration value="pendingUpdate"/>
       <enumeration value="serverDeleteProhibited"/>
       <enumeration value="serverUpdateProhibited"/>
     </restriction>
   </simpleType>
 <!--
 Pending action notification response elements.
 -->
   <complexType name="panDataType">
     <sequence>
       <element name="name" type="host:paNameType"/>
       <element name="paTRID" type="epp:trIDType"/>
       <element name="paDate" type="dateTime"/>
     </sequence>
   </complexType>
   <complexType name="paNameType">
     <simpleContent>
       <extension base="eppcom:labelType">
         <attribute name="paResult" type="boolean"
          use="required"/>
       </extension>
     </simpleContent>
   </complexType>
 <!--
 End of schema.
 -->
 </schema>
 END

5. Internationalization Considerations

 EPP is represented in XML, which provides native support for encoding
 information using the Unicode character set and its more compact
 representations including UTF-8.  Conformant XML processors recognize
 both UTF-8 and UTF-16 [RFC2781].  Though XML includes provisions to
 identify and use other character encodings through use of an
 "encoding" attribute in an <?xml?> declaration, use of UTF-8 is
 RECOMMENDED in environments where parser encoding support
 incompatibility exists.
 All date-time values presented via EPP MUST be expressed in Universal
 Coordinated Time using the Gregorian calendar.  XML Schema allows use
 of time zone identifiers to indicate offsets from the zero meridian,
 but this option MUST NOT be used with EPP.  The extended date-time

Hollenbeck Standards Track [Page 24] RFC 3732 EPP Host Mapping March 2004

 form using upper case "T" and "Z" characters defined in [RFC3339]
 MUST be used to represent date-time values as XML Schema does not
 support truncated date-time forms or lower case "T" and "Z"
 characters.
 This document requires host name syntax as specified in [RFC952] as
 updated by [RFC1123].  At the time of this writing, RFC 3490
 [RFC3490] describes a standard to use certain ASCII name labels to
 represent non-ASCII name labels.  These conformance requirements
 might change as a result of progressing work in developing standards
 for internationalized host names.

6. IANA Considerations

 This document uses URNs to describe XML namespaces and XML schemas
 conforming to a registry mechanism described in [RFC3688].  Two URI
 assignments have been registered by the IANA.
 Registration request for the host namespace:
 URI: urn:ietf:params:xml:ns:host-1.0
 Registrant Contact: See the "Author's Address" section of this
 document.
 XML: None.  Namespace URIs do not represent an XML specification.
 Registration request for the host XML schema:
 URI: urn:ietf:params:xml:schema:host-1.0
 Registrant Contact: See the "Author's Address" section of this
 document.
 XML: See the "Formal Syntax" section of this document.

7. Security Considerations

 The object mapping described in this document does not provide any
 security services or introduce any additional considerations beyond
 those described by [RFC3730] and protocol layers used by EPP.

8. Acknowledgements

 This document was originally written as an individual submission
 Internet-Draft.  The provreg working group later adopted it as a
 working group document and provided many invaluable comments and
 suggested improvements.  The author wishes to acknowledge the efforts

Hollenbeck Standards Track [Page 25] RFC 3732 EPP Host Mapping March 2004

 of WG chairs Edward Lewis and Jaap Akkerhuis for their process and
 editorial contributions.
 Specific suggestions that have been incorporated into this document
 were provided by Chris Bason, Jordyn Buchanan, Dave Crocker, Anthony
 Eden, Sheer El-Showk, Klaus Malorny, Dan Manley, Michael Mealling,
 Patrick Mevzek, and Rick Wesson.

9. References

9.1. Normative References

 [RFC791]   Postel, J., "Internet Protocol", STD 5, RFC 791, September
            1981.
 [RFC952]   Harrenstien, K, Stahl, M. and E. Feinler, "DOD Internet
            Host Table Specification", RFC 952, October 1985.
 [RFC1034]  Mockapetris, P., "Domain Names - Concepts and Facilities",
            STD 13, RFC 1034, November 1987.
 [RFC1035]  Mockapetris, P., "Domain Names - Implementation and
            Specification", STD 13, RFC 1035, November 1987.
 [RFC1123]  Braden, R., "Requirements for Internet Hosts --
            Application and Support", STD 3, RFC 1123, October 1989.
 [RFC2119]  Bradner, S., "Key Words for Use in RFCs to Indicate
            Requirement Levels", BCP 14, RFC 2119, March 1997.
 [RFC3339]  Klyne, G. and C. Newman, "Date and Time on the Internet:
            Timestamps", RFC 3339, July 2002.
 [RFC3513]  Hinden, R. and S. Deering, "IP Version 6 Addressing
            Architecture", RFC 3513, April 2003.
 [RFC3688]  Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
            January 2004.
 [RFC3730]  Hollenbeck, S., "Extensible Provisioning Protocol (EPP)",
            RFC 3730, March 2004.
 [XML]      Editor T. Bray et al.: "Extensible Markup Language (XML)
            1.0 (Second Edition)", W3C Recommendation 6 October 2000.
 [XMLS-1]   Editors H. Thompson et al.: "XML Schema Part 1:
            Structures", W3C Recommendation 2 May 2001.

Hollenbeck Standards Track [Page 26] RFC 3732 EPP Host Mapping March 2004

 [XMLS-2]   Editors P. Biron, A. Malhotra: "XML Schema Part 2:
            Datatypes", W3C Recommendation 2 May 2001.

9.2. Informative References

 [RFC1886]  Thomson, S. and C. Huitema, "DNS Extensions to support IP
            version 6", RFC 1886, December 1995.
 [RFC2781]  Hoffman, P. and F. Yergeau, "UTF-16, an encoding of ISO
            10646", RFC 2781, February 2000.
 [RFC2874]  Crawford, M. and C. Huitema, "DNS Extensions to Support
            IPv6 Address Aggregation and Renumbering", RFC 2874, July
            2000.
 [RFC3152]  Bush, R., "Delegation of IP6.ARPA", BCP 49, RFC 3152,
            August 2001.
 [RFC3490]  Faltstrom, P., Hoffman, P. and A. Costello,
            "Internationalizing Domain Names in Applications (IDNA)",
            RFC 3490, March 2003.

10. Author's Address

 Scott Hollenbeck
 VeriSign Global Registry Services
 21345 Ridgetop Circle
 Dulles, VA 20166-6503
 USA
 EMail: shollenbeck@verisign.com

Hollenbeck Standards Track [Page 27] RFC 3732 EPP Host Mapping March 2004

11. Full Copyright Statement

 Copyright (C) The Internet Society (2004).  This document is subject
 to the rights, licenses and restrictions contained in BCP 78 and
 except as set forth therein, the authors retain all their rights.
 This document and the information contained herein are provided on an
 "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS
 OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET
 ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED,
 INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE
 INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
 WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

Intellectual Property

 The IETF takes no position regarding the validity or scope of any
 Intellectual Property Rights or other rights that might be claimed to
 pertain to the implementation or use of the technology described in
 this document or the extent to which any license under such rights
 might or might not be available; nor does it represent that it has
 made any independent effort to identify any such rights.  Information
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Acknowledgement

 Funding for the RFC Editor function is currently provided by the
 Internet Society.

Hollenbeck Standards Track [Page 28]

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