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PROPOSED STANDARD

    Internet Engineering Task Force (IETF)                          J. Gould
    Request for Comments: 8590                                VeriSign, Inc.
    Category: Standards Track                                       K. Feher
    ISSN: 2070-1721                                                  Neustar
                                                                    May 2019

      Change Poll Extension for the Extensible Provisioning Protocol (EPP)

    Abstract

       This document describes an Extensible Provisioning Protocol (EPP)
       extension for notifying clients of operations on client-sponsored
       objects that were not initiated by the client through EPP.  These
       operations may include contractual or policy requirements including,
       but not limited to, regular batch processes, customer support
       actions, Uniform Domain-Name Dispute-Resolution Policy (UDRP) or
       Uniform Rapid Suspension (URS) actions, court-directed actions, and
       bulk updates based on customer requests.  Since the client is not
       directly involved or knowledgable of these operations, the extension
       is used along with an EPP object mapping to provide the resulting
       state of the postoperation object, and optionally a preoperation
       object, with the operation metadata of what, when, who, and why.

    Status of This Memo

       This is an Internet Standards Track document.

       This document is a product of the Internet Engineering Task Force
       (IETF).  It represents the consensus of the IETF community.  It has
       received public review and has been approved for publication by the
       Internet Engineering Steering Group (IESG).  Further information on
       Internet Standards is available in Section 2 of RFC 7841.

       Information about the current status of this document, any errata,
       and how to provide feedback on it may be obtained at
       https://www.rfc-editor.org/info/rfc8590.

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    Copyright Notice

       Copyright (c) 2019 IETF Trust and the persons identified as the
       document authors.  All rights reserved.

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

    Table of Contents

       1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
         1.1.  Conventions Used in This Document . . . . . . . . . . . .   3
       2.  Object Attributes . . . . . . . . . . . . . . . . . . . . . .   4
         2.1.  Operation . . . . . . . . . . . . . . . . . . . . . . . .   4
         2.2.  State . . . . . . . . . . . . . . . . . . . . . . . . . .   5
         2.3.  Who . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
         2.4.  Dates and Times . . . . . . . . . . . . . . . . . . . . .   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  . . . . . . . . . . . . . . . . .   6
           3.1.3.  EPP <transfer> Command  . . . . . . . . . . . . . . .  14
         3.2.  EPP Transform Commands  . . . . . . . . . . . . . . . . .  14
           3.2.1.  EPP <create> Command  . . . . . . . . . . . . . . . .  14
           3.2.2.  EPP <delete> Command  . . . . . . . . . . . . . . . .  14
           3.2.3.  EPP <renew> Command . . . . . . . . . . . . . . . . .  14
           3.2.4.  EPP <transfer> Command  . . . . . . . . . . . . . . .  14
           3.2.5.  EPP <update> Command  . . . . . . . . . . . . . . . .  14
       4.  Formal Syntax . . . . . . . . . . . . . . . . . . . . . . . .  15
         4.1.  Change Poll Extension Schema  . . . . . . . . . . . . . .  15
       5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  18
         5.1.  XML Namespace . . . . . . . . . . . . . . . . . . . . . .  18
         5.2.  EPP Extension Registry  . . . . . . . . . . . . . . . . .  18
       6.  Security Considerations . . . . . . . . . . . . . . . . . . .  19
       7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  19
         7.1.  Normative References  . . . . . . . . . . . . . . . . . .  19
         7.2.  Informative References  . . . . . . . . . . . . . . . . .  20
       Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  20
       Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  20

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    1.  Introduction

       This document describes an extension mapping for version 1.0 of the
       Extensible Provisioning Protocol (EPP) [RFC5730].  This mapping, an
       extension to EPP object mappings like the EPP domain name mapping
       [RFC5731], is used to notify clients of operations they are not
       directly involved in, on objects that the client sponsors.  It is up
       to server policy to determine what transform operations and clients
       to notify.  Using this extension, clients can more easily keep their
       systems in sync with the objects stored in the server.  When a change
       occurs that a client needs to be notified of, a poll message can be
       inserted by the server for consumption by the client using the EPP
       <poll> command and response defined in [RFC5730].  The extension
       supports including a "before" operation poll message and an "after"
       operation poll message.  The extension only extends the EPP <poll>
       response in [RFC5730] and does not extend the EPP <poll> command.
       Please refer to [RFC5730] for information and examples of the EPP
       <poll> command.

    1.1.  Conventions Used in This Document

       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] [RFC8174] when, and only when, they appear in all
       capitals, as shown here.

       XML is case sensitive.  Unless stated otherwise, XML specifications
       and examples provided in this document MUST be interpreted in the
       character case presented in order to develop a conforming
       implementation.

       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 are provided only to illustrate element
       relationships and are not a REQUIRED feature of this protocol.

       The XML namespace prefix "changePoll" is used for the namespace
       "urn:ietf:params:xml:ns:changePoll-1.0", but implementations MUST NOT
       depend on it; instead, they should employ a proper namespace-aware
       XML parser and serializer to interpret and output the XML documents.

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    2.  Object Attributes

       This extension adds additional elements to EPP object mappings like
       the EPP domain name mapping [RFC5731].  Only those new elements are
       described here.

    2.1.  Operation

       An operation consists of any transform operation that impacts objects
       that the client sponsors and should be notified of.  The
       <changePoll:operation> element defines the operation.  The OPTIONAL
       "op" attribute is an identifier, represented in the 7-bit US-ASCII
       character set defined in [RFC20], that is used to define a sub-
       operation or the name of a "custom" operation.  The enumerated list
       of <changePoll:operation> values is:

       "create":  Create operation as defined in [RFC5730].

       "delete":  Delete operation as defined in [RFC5730].  If the delete
           operation results in an immediate purge of the object, then the
           "op" attribute MUST be set to "purge".

       "renew":  Renew operation as defined in [RFC5730].

       "transfer":  Transfer operation as defined in [RFC5730] that MUST set
           the "op" attribute with one of the possible transfer-type values;
           these include "request", "approve", "cancel", or "reject".

       "update":  Update operation as defined in [RFC5730].

       "restore":  Restore operation as defined in [RFC3915] that MUST set
           the "op" attribute with one of the possible restore-type values;
           these include "request" or "report".

       "autoRenew":  Auto renew operation executed by the server.

       "autoDelete":  Auto delete operation executed by the server.  If the
           "autoDelete" operation results in an immediate purge of the
           object, then the "op" attribute MUST be set to "purge".

       "autoPurge":  Auto purge operation executed by the server when
           removing the object after it has had the status "pendingDelete".

       "custom":  Custom operation that MUST set the "op" attribute with the
           custom operation name.  The custom operations supported are up to
           server policy.

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    2.2.  State

       The state attribute reflects the state of the object "before" or
       "after" the operation.  The state is defined using the OPTIONAL
       "state" attribute of the <changePoll:changeData> element, with the
       possible values "before" or "after" and a default value of "after".
       The server MAY support both the "before" state and the "after" state
       of the operation by using one poll message for the "before" state and
       one poll message for the "after" state.  The "before" state poll
       message MUST be inserted into the message queue prior to the "after"
       state poll message.

       For operations in Section 2.1 that don't have an "after" state, the
       server MUST use the "before" state poll message.  For example, for
       the "delete" operation with the "op" attribute set to "purge", or the
       "autoPurge" operation, the server includes the state of the object
       prior to being purged in the "before" state poll message.

       For operations in Section 2.1 that don't have a "before" state, the
       server MUST use the "after" state poll message.  For example, for the
       "create" operation, the server includes the state of the object after
       creation in the "after" state poll message.

    2.3.  Who

       The <changePoll:who> element defines who executed the operation, for
       audit purposes.  It is a free-form value that is meant strictly for
       audit purposes and not to drive client-side logic.  The scheme used
       for the possible set of <changePoll:who> element values is up to
       server policy.  The server MAY identify the <changePoll:who> element
       value based on:

       "Identifier":  Unique user identifier of the user that executed the
           operation.  An example is "ClientX".

       "Name":  Name of the user that executed the operation.  An example is
           "John Doe".

       "Role":  Role of the user that executed operation.  An example is
           "CSR" for a Customer Support Representative or "Batch" for a
           server batch.

    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 uppercase "T" and "Z" characters defined in

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       [W3C.REC-xmlschema-2-20041028] MUST be used to represent date-time
       values, as XML Schema does not support truncated date-time forms or
       lowercase "T" and "Z" characters.

    3.  EPP Command Mapping

       A detailed description of the EPP syntax and semantics can be found
       in the EPP core protocol specification [RFC5730].

    3.1.  EPP Query Commands

       EPP provides three commands to retrieve object information: <check>
       to determine if an object is known to the server, <info> to retrieve
       detailed information associated with an object, and <transfer> to
       retrieve object-transfer status information.

    3.1.1.  EPP <check> Command

       This extension does not add any elements to the EPP <check> command
       or <check> response described in [RFC5730].

    3.1.2.  EPP <info> Command

       This extension does not add any elements to the EPP <info> command
       described in [RFC5730].

       This extension adds operational detail of EPP object-mapping
       operations (Section 2.1) to an EPP poll response, as described in
       [RFC5730].  It is an extension of the EPP object-mapping info
       response.  Any transform operation to an object defined in an EPP
       object mapping by a client other than the sponsoring client MAY
       result in extending the <info> response of the object for inserting
       an EPP poll message with the operation detail.  The sponsoring client
       will then receive the state of the object with operation detail like
       what, who, when, and why the object was changed.  The
       <changePoll:changeData> element contains the operation detail along
       with an indication of whether the object reflects the state before or
       after the operation as defined in Section 2.2.  The
       <changePoll:changeData> element includes the operation detail with
       the following child elements:

       <changePoll:operation>:  Transform operation executed on the object,
           as defined in Section 2.1.

       <changePoll:date>:  Date and time when the operation was executed.

       <changePoll:svTRID>:  Server transaction identifier of the operation.

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       <changePoll:who>:  Who executed the operation, as defined in
           Section 2.3.

       <changePoll:caseId>:  OPTIONAL case identifier associated with the
           operation.  The required "type" attribute defines the type of
           case.  The OPTIONAL "name" attribute is an identifier,
           represented in the 7-bit US-ASCII character set defined in
           [RFC20], that is used to define the name of the "custom" case
           type.  The enumerated list of case types is:

           udrp:  A Uniform Domain-Name Dispute-Resolution Policy (UDRP)
              case.

           urs:  A Uniform Rapid Suspension (URS) case.

           custom:  A custom case that is defined using the "name"
              attribute.

       <changePoll:reason>:  OPTIONAL reason for executing the operation.
           If present, this element contains the server-specific text to
           help explain the reason the operation was executed.  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).

       The following is an example poll <info> response with the
       <changePoll:changeData> extension for a URS lock transaction on the
       domain.example domain name, with the "before" state.  The "before"
       state is reflected in the <resData> block:

       S:<?xml version="1.0" encoding="UTF-8"?>
       S:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
       S:   <response>
       S:      <result code="1301">
       S:         <msg lang="en-US">
       S:       Command completed successfully; ack to dequeue</msg>
       S:      </result>
       S:      <msgQ id="201" count="1">
       S:         <qDate>2013-10-22T14:25:57.0Z</qDate>
       S:         <msg>Registry initiated update of domain.</msg>
       S:      </msgQ>
       S:    <resData>
       S:      <domain:infData
       S:       xmlns:domain="urn:ietf:params:xml:ns:domain-1.0">
       S:        <domain:name>domain.example</domain:name>
       S:        <domain:roid>EXAMPLE1-REP</domain:roid>
       S:        <domain:status s="ok"/>

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       S:        <domain:registrant>jd1234</domain:registrant>
       S:        <domain:contact type="admin">sh8013</domain:contact>
       S:        <domain:contact type="tech">sh8013</domain:contact>
       S:        <domain:clID>ClientX</domain:clID>
       S:        <domain:crID>ClientY</domain:crID>
       S:        <domain:crDate>2012-04-03T22:00:00.0Z</domain:crDate>
       S:        <domain:exDate>2014-04-03T22:00:00.0Z</domain:exDate>
       S:      </domain:infData>
       S:    </resData>
       S:    <extension>
       S:      <changePoll:changeData
       S:        xmlns:changePoll="urn:ietf:params:xml:ns:changePoll-1.0"
       S:        state="before">
       S:        <changePoll:operation>update</changePoll:operation>
       S:        <changePoll:date>2013-10-22T14:25:57.0Z</changePoll:date>
       S:        <changePoll:svTRID>12345-XYZ</changePoll:svTRID>
       S:        <changePoll:who>URS Admin</changePoll:who>
       S:        <changePoll:caseId type="urs">urs123</changePoll:caseId>
       S:        <changePoll:reason>URS Lock</changePoll:reason>
       S:      </changePoll:changeData>
       S:    </extension>
       S:    <trID>
       S:      <clTRID>ABC-12345</clTRID>
       S:      <svTRID>54321-XYZ</svTRID>
       S:    </trID>
       S:   </response>
       S:</epp>

       The following is an example poll <info> response with the
       <changePoll:changeData> extension for a URS lock transaction on the
       domain.example domain name, with the "after" state.  The "after"
       state is reflected in the <resData> block:

       S:<?xml version="1.0" encoding="UTF-8"?>
       S:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
       S:   <response>
       S:      <result code="1301">
       S:         <msg lang="en-US">
       S:       Command completed successfully; ack to dequeue</msg>
       S:      </result>
       S:      <msgQ id="202" count="1">
       S:         <qDate>2013-10-22T14:25:57.0Z</qDate>
       S:         <msg>Registry initiated update of domain.</msg>
       S:      </msgQ>
       S:    <resData>
       S:      <domain:infData
       S:       xmlns:domain="urn:ietf:params:xml:ns:domain-1.0">
       S:        <domain:name>domain.example</domain:name>

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       S:        <domain:roid>EXAMPLE1-REP</domain:roid>
       S:        <domain:status s="serverUpdateProhibited"/>
       S:        <domain:status s="serverDeleteProhibited"/>
       S:        <domain:status s="serverTransferProhibited"/>
       S:        <domain:registrant>jd1234</domain:registrant>
       S:        <domain:contact type="admin">sh8013</domain:contact>
       S:        <domain:contact type="tech">sh8013</domain:contact>
       S:        <domain:clID>ClientX</domain:clID>
       S:        <domain:crID>ClientY</domain:crID>
       S:        <domain:crDate>2012-04-03T22:00:00.0Z</domain:crDate>
       S:        <domain:upID>ClientZ</domain:upID>
       S:        <domain:upDate>2013-10-22T14:25:57.0Z</domain:upDate>
       S:        <domain:exDate>2014-04-03T22:00:00.0Z</domain:exDate>
       S:      </domain:infData>
       S:    </resData>
       S:    <extension>
       S:      <changePoll:changeData
       S:        xmlns:changePoll="urn:ietf:params:xml:ns:changePoll-1.0"
       S:        state="after">
       S:        <changePoll:operation>update</changePoll:operation>
       S:        <changePoll:date>2013-10-22T14:25:57.0Z</changePoll:date>
       S:        <changePoll:svTRID>12345-XYZ</changePoll:svTRID>
       S:        <changePoll:who>URS Admin</changePoll:who>
       S:        <changePoll:caseId type="urs">urs123</changePoll:caseId>
       S:        <changePoll:reason>URS Lock</changePoll:reason>
       S:      </changePoll:changeData>
       S:    </extension>
       S:    <trID>
       S:      <clTRID>ABC-12345</clTRID>
       S:      <svTRID>54321-XYZ</svTRID>
       S:    </trID>
       S:   </response>
       S:</epp>

       The following is an example poll <info> response with the
       <changePoll:changeData> extension for a custom "sync" operation on
       the domain.example domain name, with the default "after" state.  The
       "after" state is reflected in the <resData> block:

       S:<?xml version="1.0" encoding="UTF-8"?>
       S:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
       S:   <response>
       S:      <result code="1301">
       S:         <msg>Command completed successfully; ack to dequeue</msg>
       S:      </result>
       S:      <msgQ id="201" count="1">
       S:         <qDate>2013-10-22T14:25:57.0Z</qDate>
       S:    <msg>Registry initiated Sync of Domain Expiration Date</msg>

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       S:      </msgQ>
       S:    <resData>
       S:      <domain:infData
       S:       xmlns:domain="urn:ietf:params:xml:ns:domain-1.0">
       S:        <domain:name>domain.example</domain:name>
       S:        <domain:roid>EXAMPLE1-REP</domain:roid>
       S:        <domain:status s="ok"/>
       S:        <domain:registrant>jd1234</domain:registrant>
       S:        <domain:contact type="admin">sh8013</domain:contact>
       S:        <domain:contact type="tech">sh8013</domain:contact>
       S:        <domain:clID>ClientX</domain:clID>
       S:        <domain:crID>ClientY</domain:crID>
       S:        <domain:crDate>2012-04-03T22:00:00.0Z</domain:crDate>
       S:        <domain:upID>ClientZ</domain:upID>
       S:        <domain:upDate>2013-10-22T14:25:57.0Z</domain:upDate>
       S:        <domain:exDate>2014-04-03T22:00:00.0Z</domain:exDate>
       S:      </domain:infData>
       S:    </resData>
       S:    <extension>
       S:      <changePoll:changeData
       S:        xmlns:changePoll="urn:ietf:params:xml:ns:changePoll-1.0">
       S:        <changePoll:operation op="sync">custom
       S:        </changePoll:operation>
       S:        <changePoll:date>2013-10-22T14:25:57.0Z</changePoll:date>
       S:        <changePoll:svTRID>12345-XYZ</changePoll:svTRID>
       S:        <changePoll:who>CSR</changePoll:who>
       S:        <changePoll:reason lang="en">Customer sync request
       S:        </changePoll:reason>
       S:      </changePoll:changeData>
       S:    </extension>
       S:    <trID>
       S:      <clTRID>ABC-12345</clTRID>
       S:      <svTRID>54321-XYZ</svTRID>
       S:    </trID>
       S:   </response>
       S:</epp>

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       The following is an example poll <info> response with the
       <changePoll:changeData> extension for a "delete" operation on the
       domain.example domain name that is immediately purged, with the
       "before" state.  The "before" state is reflected in the <resData>
       block:

       S:<?xml version="1.0" encoding="UTF-8"?>
       S:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
       S:  <response>
       S:    <result code="1301">
       S:      <msg>Command completed successfully; ack to dequeue</msg>
       S:    </result>
       S:    <msgQ id="200" count="1">
       S:      <qDate>2013-10-22T14:25:57.0Z</qDate>
       S:      <msg>Registry initiated delete of
       S:         domain resulting in immediate purge.</msg>
       S:    </msgQ>
       S:    <resData>
       S:      <domain:infData
       S:        xmlns:domain="urn:ietf:params:xml:ns:domain-1.0">
       S:        <domain:name>domain.example</domain:name>
       S:        <domain:roid>EXAMPLE1-REP</domain:roid>
       S:        <domain:clID>ClientX</domain:clID>
       S:      </domain:infData>
       S:    </resData>
       S:    <extension>
       S:      <changePoll:changeData
       S:        xmlns:changePoll="urn:ietf:params:xml:ns:changePoll-1.0"
       S:        state="before">
       S:        <changePoll:operation op="purge">delete
       S:        </changePoll:operation>
       S:        <changePoll:date>2013-10-22T14:25:57.0Z
       S:        </changePoll:date>
       S:        <changePoll:svTRID>12345-XYZ
       S:        </changePoll:svTRID>
       S:        <changePoll:who>ClientZ
       S:        </changePoll:who>
       S:        <changePoll:reason>Court order
       S:        </changePoll:reason>
       S:      </changePoll:changeData>
       S:    </extension>
       S:    <trID>
       S:      <clTRID>ABC-12345</clTRID>
       S:      <svTRID>54321-XYZ</svTRID>
       S:    </trID>
       S:  </response>
       S:</epp>

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       The following is an example poll <info> response with the
       <changePoll:changeData> extension for an "autoPurge" operation on the
       domain.example domain name that previously had the "pendingDelete"
       status, with the "before" state.  The "before" state is reflected in
       the <resData> block:

       S:<?xml version="1.0" encoding="UTF-8"?>
       S:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
       S:  <response>
       S:    <result code="1301">
       S:      <msg>Command completed successfully; ack to dequeue
       S:      </msg>
       S:    </result>
       S:    <msgQ id="200" count="1">
       S:      <qDate>2013-10-22T14:25:57.0Z</qDate>
       S:      <msg>Registry purged domain with pendingDelete status.
       S:      </msg>
       S:    </msgQ>
       S:    <resData>
       S:      <domain:infData
       S:        xmlns:domain="urn:ietf:params:xml:ns:domain-1.0">
       S:        <domain:name>domain.example</domain:name>
       S:        <domain:roid>EXAMPLE1-REP</domain:roid>
       S:        <domain:status s="pendingDelete"/>
       S:        <domain:clID>ClientX</domain:clID>
       S:      </domain:infData>
       S:    </resData>
       S:    <extension>
       S:      <changePoll:changeData
       S:        xmlns:changePoll="urn:ietf:params:xml:ns:changePoll-1.0"
       S:        state="before">
       S:        <changePoll:operation>autoPurge
       S:        </changePoll:operation>
       S:        <changePoll:date>2013-10-22T14:25:57.0Z
       S:        </changePoll:date>
       S:        <changePoll:svTRID>12345-XYZ
       S:        </changePoll:svTRID>
       S:        <changePoll:who>Batch
       S:        </changePoll:who>
       S:        <changePoll:reason>Past pendingDelete 5 day period
       S:        </changePoll:reason>
       S:      </changePoll:changeData>
       S:    </extension>
       S:    <trID>
       S:      <clTRID>ABC-12345</clTRID>
       S:      <svTRID>54321-XYZ</svTRID>
       S:    </trID>

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       S:  </response>
       S:</epp>

       The following is an example poll <info> response with the
       <changePoll:changeData> extension for an "update" operation on the
       ns1.domain.example host, with the default "after" state.  The "after"
       state is reflected in the <resData> block:

       S:<?xml version="1.0" encoding="UTF-8"?>
       S:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
       S:   <response>
       S:      <result code="1301">
       S:         <msg>Command completed successfully; ack to dequeue</msg>
       S:      </result>
       S:      <msgQ id="201" count="1">
       S:         <qDate>2013-10-22T14:25:57.0Z</qDate>
       S:         <msg>Registry initiated update of host.</msg>
       S:      </msgQ>
       S:    <resData>
       S:      <host:infData
       S:       xmlns:host="urn:ietf:params:xml:ns:host-1.0">
       S:        <host:name>ns1.domain.example</host:name>
       S:        <host:roid>NS1_EXAMPLE1-REP</host:roid>
       S:        <host:status s="linked"/>
       S:        <host:status s="serverUpdateProhibited"/>
       S:        <host:status s="serverDeleteProhibited"/>
       S:        <host:addr ip="v4">192.0.2.2</host:addr>
       S:        <host:addr ip="v6">2001:db8:0:0:1:0:0:1</host:addr>
       S:        <host:clID>ClientX</host:clID>
       S:        <host:crID>ClientY</host:crID>
       S:        <host:crDate>2012-04-03T22:00:00.0Z</host:crDate>
       S:        <host:upID>ClientY</host:upID>
       S:        <host:upDate>2013-10-22T14:25:57.0Z</host:upDate>
       S:      </host:infData>
       S:    </resData>
       S:    <extension>
       S:      <changePoll:changeData
       S:        xmlns:changePoll="urn:ietf:params:xml:ns:changePoll-1.0">
       S:        <changePoll:operation>update</changePoll:operation>
       S:        <changePoll:date>2013-10-22T14:25:57.0Z</changePoll:date>
       S:        <changePoll:svTRID>12345-XYZ</changePoll:svTRID>
       S:        <changePoll:who>ClientZ</changePoll:who>
       S:        <changePoll:reason>Host Lock</changePoll:reason>
       S:      </changePoll:changeData>
       S:    </extension>
       S:    <trID>
       S:      <clTRID>ABC-12345</clTRID>
       S:      <svTRID>54321-XYZ</svTRID>

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       S:    </trID>
       S:   </response>
       S:</epp>

    3.1.3.  EPP <transfer> Command

       This extension does not add any elements to the EPP <transfer> query
       command or <transfer> response described in the [RFC5730].

    3.2.  EPP Transform Commands

       EPP provides five commands to transform objects: <create> to create
       an instance of an object, <delete> to delete an instance of an
       object, <renew> to extend the validity period of an object,
       <transfer> to manage object-sponsorship changes, and <update> to
       change information associated with an object.

    3.2.1.  EPP <create> Command

       This extension does not add any elements to the EPP <create> command
       or <create> response described in [RFC5730].

    3.2.2.  EPP <delete> Command

       This extension does not add any elements to the EPP <delete> command
       or <delete> response described in [RFC5730].

    3.2.3.  EPP <renew> Command

       This extension does not add any elements to the EPP <renew> command
       or <renew> response described in [RFC5730].

    3.2.4.  EPP <transfer> Command

       This extension does not add any elements to the EPP <transfer>
       command or <transfer> response described in [RFC5730].

    3.2.5.  EPP <update> Command

       This extension does not add any elements to the EPP <update> command
       or <update> response described in [RFC5730].

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    4.  Formal Syntax

       One schema is presented here: the EPP Change Poll Extension schema.

       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.

    4.1.  Change Poll Extension Schema

       BEGIN
       <?xml version="1.0" encoding="UTF-8"?>
        <schema targetNamespace="urn:ietf:params:xml:ns:changePoll-1.0"
                xmlns:eppcom="urn:ietf:params:xml:ns:eppcom-1.0"
                xmlns:epp="urn:ietf:params:xml:ns:epp-1.0"
                xmlns:changePoll="urn:ietf:params:xml:ns:changePoll-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"/>
         <import namespace="urn:ietf:params:xml:ns:epp-1.0"/>

          <annotation>
            <documentation>
              Extensible Provisioning Protocol v1.0
              Change Poll Mapping Schema.
            </documentation>
          </annotation>

          <!--
           Change element.
          -->
          <element name="changeData" type="changePoll:changeDataType"/>

          <!--
           Attributes associated with the change.
          -->
          <complexType name="changeDataType">
            <sequence>
              <element name="operation" type="changePoll:operationType"/>
              <element name="date" type="dateTime"/>
              <element name="svTRID" type="epp:trIDStringType"/>

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              <element name="who" type="changePoll:whoType"/>
              <element name="caseId" type="changePoll:caseIdType"
                minOccurs="0"/>
              <element name="reason" type="eppcom:reasonType"
                minOccurs="0"/>
            </sequence>
           <attribute name="state" type="changePoll:stateType"
             default="after"/>
          </complexType>

          <!--
           Enumerated list of operations, with extensibility via "custom".
          -->
          <simpleType name="operationEnum">
            <restriction base="token">
              <enumeration value="create"/>
              <enumeration value="delete"/>
              <enumeration value="renew"/>
              <enumeration value="transfer"/>
              <enumeration value="update"/>
              <enumeration value="restore"/>
              <enumeration value="autoRenew"/>
              <enumeration value="autoDelete"/>
              <enumeration value="autoPurge"/>
              <enumeration value="custom"/>
            </restriction>
          </simpleType>

          <!--
           Enumerated state of the object in the poll message.
          -->
          <simpleType name="stateType">
            <restriction base="token">
              <enumeration value="before"/>
              <enumeration value="after"/>
            </restriction>
          </simpleType>

          <!--
           Transform operation type
          -->
         <complexType name="operationType">
           <simpleContent>
             <extension base="changePoll:operationEnum">
               <attribute name="op" type="token"/>
             </extension>
           </simpleContent>
         </complexType>

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          <!--
           Case identifier type
          -->
         <complexType name="caseIdType">
           <simpleContent>
             <extension base="token">
               <attribute name="type" type="changePoll:caseTypeEnum"
                 use="required"/>
               <attribute name="name" type="token"
                 use="optional"/>
             </extension>
           </simpleContent>
         </complexType>

          <!--
           Enumerated list of case identifier types
          -->
          <simpleType name="caseTypeEnum">
            <restriction base="token">
              <enumeration value="udrp"/>
              <enumeration value="urs"/>
              <enumeration value="custom"/>
            </restriction>
          </simpleType>

          <!--
           Who type
          -->
         <simpleType name="whoType">
           <restriction base="normalizedString">
             <minLength value="1"/>
             <maxLength value="255"/>
           </restriction>
         </simpleType>

        <!--
        End of schema.
        -->
        </schema>
       END

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    5.  IANA Considerations

    5.1.  XML Namespace

       This document uses URNs to describe XML namespaces and XML schemas
       conforming to a registry mechanism described in [RFC3688].  The
       following URI assignment has been made by IANA:

       Registration for the changePoll namespace:

          URI: urn:ietf:params:xml:ns:changePoll-1.0

          Registrant Contact: IESG

          XML: None.  Namespace URIs do not represent an XML specification.

       Registration for the changePoll XML schema:

          URI: urn:ietf:params:xml:ns:changePoll-1.0

          Registrant Contact: IESG

          XML: See the "Formal Syntax" section of this document.

    5.2.  EPP Extension Registry

       The EPP extension described in this document has been registered by
       the IANA in the Extensions for the "Extensible Provisioning Protocol
       (EPP)" registry described in [RFC7451].  The details of the
       registration are as follows:

       Name of Extension: Change Poll Extension for the Extensible
       Provisioning Protocol (EPP)

       Document Status: Standards Track

       Reference: RFC 8590

       Registrant Name and Email Address: IESG <iesg@ietf.org>

       TLDs: Any

       IPR Disclosure: None

       Status: Active

       Notes: None

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    6.  Security Considerations

       The mapping extensions described in this document do not provide any
       security services beyond those described by EPP [RFC5730] and
       protocol layers used by EPP.  The security considerations described
       in these other specifications apply to this specification as well.

    7.  References

    7.1.  Normative References

       [RFC20]    Cerf, V., "ASCII format for network interchange", STD 80,
                  RFC 20, DOI 10.17487/RFC0020, October 1969,
                  <https://www.rfc-editor.org/info/rfc20>.

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

       [RFC3688]  Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
                  DOI 10.17487/RFC3688, January 2004,
                  <https://www.rfc-editor.org/info/rfc3688>.

       [RFC3915]  Hollenbeck, S., "Domain Registry Grace Period Mapping for
                  the Extensible Provisioning Protocol (EPP)", RFC 3915,
                  DOI 10.17487/RFC3915, September 2004,
                  <https://www.rfc-editor.org/info/rfc3915>.

       [RFC5730]  Hollenbeck, S., "Extensible Provisioning Protocol (EPP)",
                  STD 69, RFC 5730, DOI 10.17487/RFC5730, August 2009,
                  <https://www.rfc-editor.org/info/rfc5730>.

       [RFC5731]  Hollenbeck, S., "Extensible Provisioning Protocol (EPP)
                  Domain Name Mapping", STD 69, RFC 5731,
                  DOI 10.17487/RFC5731, August 2009,
                  <https://www.rfc-editor.org/info/rfc5731>.

       [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
                  2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
                  May 2017, <https://www.rfc-editor.org/info/rfc8174>.

       [W3C.REC-xmlschema-2-20041028]
                  Biron, P. and A. Malhotra, "XML Schema Part 2: Datatypes
                  Second Edition", World Wide Web Consortium Recommendation
                  REC-xmlschema-2-20041028, October 2004,
                  <http://www.w3.org/TR/2004/REC-xmlschema-2-20041028>.

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    7.2.  Informative References

       [RFC7451]  Hollenbeck, S., "Extension Registry for the Extensible
                  Provisioning Protocol", RFC 7451, DOI 10.17487/RFC7451,
                  February 2015, <https://www.rfc-editor.org/info/rfc7451>.

    Acknowledgments

       The authors wish to acknowledge the original concept for this
       document and the efforts in the initial versions of this document by
       Trung Tran and Sharon Wodjenski.

       Special suggestions that have been incorporated into this document
       were provided by Scott Hollenbeck, Michael Holloway, and Patrick
       Mevzek.

    Authors' Addresses

       James Gould
       VeriSign, Inc.
       12061 Bluemont Way
       Reston, VA  20190
       United States of America

       Email: jgould@verisign.com
       URI:   http://www.verisign.com

       Kal Feher
       Neustar
       lvl 8/10 Queens Road
       Melbourne, VIC  3004
       Australia

       Email: ietf@feherfamily.org
       URI:   http://www.neustar.biz

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