Internet Engineering Task Force (IETF)                        T. Sattler
Internet-Draft
Intended status: Standards Track                               R. Carney
Expires: June 30, 2021                                         J. Kolker
                                                            GoDaddy Inc.
                                                        December 8, 2020

               Registry Maintenance Notifications for the
                 Extensible Provisioning Protocol (EPP)
              draft-ietf-regext-epp-registry-maintenance-06

Abstract
   This document describes an Extensible Provision Protocol (EPP)
   mapping for registry's maintenance notifications.

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

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   This Internet-Draft will expire on June 30, 2021.

Copyright Notice
   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   described in the Simplified BSD License.

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Table of Contents
   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Terminology and Definitions . . . . . . . . . . . . . . .   3
   2.  Object Attributes . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Internationalized Domain Names  . . . . . . . . . . . . .   3
     2.2.  Dates and Times . . . . . . . . . . . . . . . . . . . . .   3
     2.3.  Maintenance Elements  . . . . . . . . . . . . . . . . . .   4
   3.  EPP Command Mapping . . . . . . . . . . . . . . . . . . . . .   6
     3.1.  EPP Query Commands  . . . . . . . . . . . . . . . . . . .   6
       3.1.1.  EPP <check> Command . . . . . . . . . . . . . . . . .   6
       3.1.2.  EPP <transfer> Command  . . . . . . . . . . . . . . .   6
       3.1.3.  EPP <info> Command  . . . . . . . . . . . . . . . . .   6
       3.1.3.1.  Info Maintenance Item . . . . . . . . . . . . . . .   6
       3.1.3.2.  Info Maintenance List . . . . . . . . . . . . . . .   8
       3.1.4.  EPP <poll> Command  . . . . . . . . . . . . . . . . .   9
     3.2.  EPP Transform Commands  . . . . . . . . . . . . . . . . .  11
       3.2.1.  EPP <create> Command  . . . . . . . . . . . . . . . .  11
       3.2.2.  EPP <delete> Command  . . . . . . . . . . . . . . . .  11
       3.2.3.  EPP <renew> Command . . . . . . . . . . . . . . . . .  11
       3.2.4.  EPP <transfer> Command  . . . . . . . . . . . . . . .  11
       3.2.5.  EPP <update> Command  . . . . . . . . . . . . . . . .  11
   4.  Formal Syntax . . . . . . . . . . . . . . . . . . . . . . . .  12
     4.1.  Registry Maintenance EPP Mapping Schema . . . . . . . . .  12
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  17
     5.1.  XML Namespace . . . . . . . . . . . . . . . . . . . . . .  17
     5.2.  EPP Extension Registry  . . . . . . . . . . . . . . . . .  17
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  18
   7.  Implementation Status . . . . . . . . . . . . . . . . . . . .  18
     7.1.  GoDaddy Registry  . . . . . . . . . . . . . . . . . . . .  18
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  19
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  19
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  19
   Appendix A.  Change History . . . . . . . . . . . . . . . . . . .  19
     A.1.  Change from draft-sattler-epp-poll-maintenance-response to
           draft-sattler-epp-registry-maintenance .  . . . . . . . .  19
     A.2.  Change from draft-sattler-epp-registry-maintenance to
           draft-ietf-regext-epp-registry-maintenance  . . . . . . .  19
     A.3.  Change from 00 to 01  . . . . . . . . . . . . . . . . . .  19
     A.4.  Change from 01 to 02  . . . . . . . . . . . . . . . . . .  20
     A.5.  Change from 02 to 03  . . . . . . . . . . . . . . . . . .  20
     A.6.  Change from 03 to 04  . . . . . . . . . . . . . . . . . .  20
     A.7.  Change from 04 to 05  . . . . . . . . . . . . . . . . . .  20
     A.8.  Change from 05 to 06  . . . . . . . . . . . . . . . . . .  20
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  21
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  21

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1.  Introduction

   Registries usually conduct maintenances and inform registrars in
   different ways. Given the expansion of the DNS namespace, it is now
   desirable to provide a method for EPP servers to notify EPP clients
   as well as a method for EPP clients to query EPP servers for upcoming
   maintenances.

   This document describes an extension mapping for version 1.0 of the
   Extensible Provision Protocol [RFC5730]. This mapping provides a
   mechanism by which EPP servers may notify and EPP clients to query  
   for upcoming maintenances.

1.1.  Terminology and Definitions

   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] when
   specified in their uppercase forms.

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

   "maint" is used as an abbreviation for "urn:ietf:params:xml:ns:epp:
   maintenance-0.1". The XML namespace prefix "maint" is used, but
   implementations MUST NOT depend on it and instead employ a proper
   namespace-aware XML parser and serializer to interpret and output
   the XML documents.

   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.

2.  Object Attributes

2.1.  Internationalized Domain Names

   Names of affected hosts MUST be provided as A-label according to
   [RFC5891].

2.2.  Dates and Times

   All dates and times attribute values MUST be expressed in Universal
   Coordinated Time (UTC) using the Gregorian calendar. The extended
   date-time form using upper case "T" and "Z" characters defined in ISO
   8601 [RFC3339] MUST be used to represent date-time values.

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2.3.  Maintenance Elements

   The <maint:item> element describes a single registry maintenance
   event during a specific period. This element is used in a maintenance
   item EPP <info> response and <poll> message.

   For creating a new maintenance the attribute <maint:crDate> MUST be
   set and the attribute <maint:upDate> SHALL NOT be present.

   For updating a maintenance the attributes <maint:crDate> and
   <maint:upDate> MUST be set.

   <maint:id>
     MUST be present and a server unique id and SHALL NOT be
     changed if maintenance is updated or deleted. A human-readable
     description of the maintenance is identified via an OPTIONAL
     "msg" attribute.

   <maint:systems>
     MUST be present and contains one or more <maint:system> elements.
     The server SHOULD NOT list systems which are not affected by the
     maintenance.

     <maint:system>
       MUST be present at least once and has an element of <maint:name>,
       <maint:host> and <maint:impact>.

       <maint:name>
         MUST be present and indicates the name of the affected system,
         such as "EPP", "WHOIS", "DNS", "Portal", etc.

       <maint:host>
         MUST be present and indicates the affected maintained system
         contains the hostname and OPTIONAL an IP address.
         Hostname SHALL be A-label according [RFC5891].
         IPv4 addresses SHALL be dotted-decimal notation.
           An example of this textual representation is "192.0.2.0".
         IPv6 addresses SHALL be according [RFC5952].
           An example of this textual representation is
           "2001:db8::1:0:0:1".

       <maint:impact>
         MUST be present and contains the impact level; values MUST
         either be "full" or "partial".

     <maint:environment>
       MUST be present and indicates the type of the affected system;
       the attribute type is REQUIRED and SHOULD either be "production",
       "ote", "staging", "dev" or "custom". And alternatively the
       attribute name could be used to define a server specific affected
       system for example. In that case name MUST be set:
       <maint:environment type="custom" name="marketing"/>

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     <maint:start>
       SHOULD be present and indicates the start of the maintenance
       according ISO 8601 [RFC3339].
       Format: YYYY-MM-DDThh:mm:ssTZ

     <maint:end>
       SHOULD be present and indicates the end of the maintenance
       according to ISO 8601 [RFC3339], and MUST be equal to or greater
       than <maint:start>.
       Format: YYYY-MM-DDThh:mm:ssTZ

     <maint:reason>
       MUST be present and contains the reason behind the maintenance;
       values SHOULD either be "planned" or "emergency".

     <maint:detail>
       MAY be present and contains URI to detailed maintenance
       description.

     <maint:description>
       MAY be present and provides a freeform description of the
       maintenance without having to create and traverse an external
       resource.

     <maint:tlds>
       SHOULD be present and contains <maint:tld> elements.

       <maint:tld>
         MUST be present and contains the affected top-level domain.
         A-label format according to [RFC5891].

     <maint:intervention>
       SHOULD be present and contains <maint:connection> and
       <maint:implementation>.

       <maint:connection>
         MUST be present and indicates if a client needs to do
         something that is connection-related, such as a reconnect. The
         value SHALL be boolean.
         
       <maint:implementation>
         MUST be present and indicates if a client needs to do something
         that is implementation-related, such as a code change. The
         value SHALL be boolean.

     <maint:crDate>
       MUST be present and contains the creation date of the maintenance
       according ISO 8601 [RFC3339].
       Format: YYYY-MM-DDThh:mm:ssTZ

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     <maint:upDate>
       MAY be present and contains the updated date of the maintenance
       according to ISO 8601 [RFC3339], and if set MUST be equal to or
       greater than <main:crDate>.
       Format: YYYY-MM-DDThh:mm:ssTZ

3.  EPP Command Mapping

   A detailed description of the EPP syntax and semantics can be found
   in the EPP core protocol specification [RFC5730]. The command
   mappings described here are specifically for the use to notify of
   Registry Maintenances and Registry Maintenance object mapping.

3.1.  EPP Query Commands

   EPP [RFC5730] 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

   Available check semantics do not apply to maintenance objects, so
   there is no mapping defined for the EPP <check> command.

3.1.2.  EPP <transfer> Command

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

3.1.3.  EPP <info> Command

   EPP provides the <info> command that is used to retrieve registry
   maintenance information. In addition to the standard EPP command
   elements, the <info> command MUST contain a <maint:info>
   element that identifies the maintenance namespace.

   The <maint:info> element MUST contain a child element. It is either
   <maint:id> to retrieve a specific maintenance item or
   <maint:list> to query all maintenance items.

3.1.3.1.  Info Maintenance Item

   The information on a specific Maintenance Item can be retrieved by
   using <info> command with the element <maint:info> and the child
   element <maint:id>.

   If a <maint:info> is sent with a <maint:id> that does not exist on
   the server side, then the result code 2303 MUST be responded.

   Example to retrieve a specific maintenance item in an <info> command.
   
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   C:<?xml version="1.0" encoding="UTF-8" standalone="no"?>
   C:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
   C:  <command>
   C:    <info>
   C:      <maint:info
   C:        xmlns:maint="urn:ietf:params:xml:ns:epp:maintenance-0.1">
   C:        <maint:id>2e6df9b0-4092-4491-bcc8-9fb2166dcee6</maint:id>
   C:      </maint:info>
   C:    </info>
   C:    <clTRID>ABC-12345</clTRID>
   C:  </command>
   C:</epp>

   When an <info> command has been processed successfully, the EPP
   <resData> element MUST contain a child <maint:infData> element that
   identifies the maintenance namespace. The <maint:infData> element 
   contains the <maint:item> element defined in Section 2.3.

   Example of returning a specific maintenance item in an <info>
   response.

   S:<?xml version="1.0" encoding="UTF-8"?>
   S:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
   S:   <response>
   S:      <result code="1000">
   S:         <msg>Command completed successfully</msg>
   S:      </result>
   S:      <resData>
   S:        <maint:infData
   S:          xmlns:maint="urn:ietf:params:xml:ns:epp:maintenance-0.1">
   S:          <maint:item>
   S:            <maint:id>2e6df9b0-4092-4491-bcc8-9fb2166dcee6
   S:            </maint:id>
   S:            <maint:systems>
   S:              <maint:system>
   S:                <maint:name>EPP</maint:name>
   S:                <maint:host>epp.registry.example
   S:                </maint:host>
   S:                <maint:impact>full</maint:impact>
   S:              </maint:system>
   S:            </maint:systems>
   S:            <maint:environment type="production"/>
   S:            <maint:start>2020-09-30T06:00:00Z</maint:start>
   S:            <maint:end>2020-09-30T14:25:57Z</maint:end>

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   S:            <maint:reason>planned</maint:reason>
   S:            <maint:detail>
   S:              https://www.registry.example/notice?123
   S:            </maint:detail>
   S:            <maint:description lang="en">free text
   S:            </maint:description>
   S:            <maint:tlds>
   S:              <maint:tld>example</maint:tld>
   S:              <maint:tld>test</maint:tld>
   S:            </maint:tlds>
   S:            <maint:intervention>
   S:              <maint:connection>false</maint:connection>
   S:              <maint:implementation>false</maint:implementation>
   S:            </maint:intervention>
   S:            <maint:crDate>2020-03-08T22:10:00Z</maint:crDate>
   S:          </maint:item>
   S:        </maint:infData>      
   S:      </resData>
   S:      <trID>
   S:         <clTRID>ABC-12345</clTRID>
   S:         <svTRID>54321-XYZ</svTRID>
   S:      </trID>
   S:   </response>
   S:</epp>

3.1.3.2. Info Maintenance List

   The Info Maintenance List can be retrieved by using the <info>
   command and the element <maint:info> with the child element
   <maint:list/>. Server policy determines if previous maintenances will
   be listed in the <maint:list>.

   Example to retrieve the maintenance list in an <info> command.

   C:<?xml version="1.0" encoding="UTF-8" standalone="no"?>
   C:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
   C:  <command>
   C:    <info>
   C:      <maint:info
   C:        xmlns:maint="urn:ietf:params:xml:ns:epp:maintenance-0.1">
   C:        <maint:list/>
   C:      </maint:info>
   C:    </info>
   C:    <clTRID>ABC-12345</clTRID>
   C:  </command>
   C:</epp>
   
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   When an <info> command has been processed successfully, the EPP
   <resData> element MUST contain a child <maint:infData> element
   that identifies the maintenance namespace. The <maint:infData>
   element contains the <maint:list> element a list of <maint:listItem>
   elements. The <maint:listItem> element contains the following child
   elements:
     <maint:id>: <maint:id> defined in Section 2.3.
     <maint:start>: <maint:start> defined in Section 2.3.
     <maint:end>: <maint:end> defined in Section 2.3.
     <maint:crDate>: <maint:crDate> defined in Section 2.3.
     <maint:upDate>: OPTIONAL <maint:upDate> defined in Section 2.3.

   Example of returning the maintenance list in an <info> response.

   S:<?xml version="1.0" encoding="UTF-8"?>
   S:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
   S:   <response>
   S:      <result code="1000">
   S:         <msg>Command completed successfully</msg>
   S:      </result>
   S:      <resData>
   S:        <maint:infData
   S:          xmlns:maint="urn:ietf:params:xml:ns:epp:maintenance-0.1">
   S:          <maint:list>
   S:            <maint:listItem>
   S:              <maint:id>2e6df9b0-4092-4491-bcc8-9fb2166dcee6
   S:              </maint:id>
   S:              <maint:start>2020-04-30T06:00:00Z</maint:start>
   S:              <maint:end>2020-04-30T07:00:00Z</maint:end>
   S:              <maint:crDate>2020-02-08T22:10:00Z</maint:crDate>
   S:            </maint:listItem>  
   S:            <maint:listItem>
   S:              <maint:id>91e9dabf-c4e9-4c19-a56c-78e3e89c2e2f
   S:              </maint:id>
   S:              <maint:start>2020-06-15T04:30:00Z</maint:start>
   S:              <maint:end>2020-06-15T05:30:00Z</maint:end>
   S:              <maint:crDate>2020-02-08T22:10:00Z</maint:crDate>
   S:              <maint:upDate>2020-03-08T20:11:00Z</maint:upDate>
   S:            </maint:listItem>
   S:          </maint:list>
   S:        </maint:infData>      
   S:      </resData>
   S:      <trID>
   S:         <clTRID>ABC-12345</clTRID>
   S:         <svTRID>54321-XYZ</svTRID>
   S:      </trID>
   S:   </response>
   S:</epp>

3.1.4.  EPP <poll> Command

   The EPP <poll> command and response is defined in Section 2.9.2.3 of
   [RFC5730]. The Registry Maintenance Notification is included in the
   EPP <poll> response of [RFC5730].
   
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   For the Registry Maintenance Notification, there are three types of
   poll messages. The poll message applies whenever the domain name
   registry creates, updates, or deletes maintenance. In the case of
   a Registry Maintenance specific message, a <maint:infData> element
   will be included within the <resData> element of the standard <poll>
   response.

   The <maint:infData> element will include a reference to the
   Registry Maintenance namespace. EPP data contained within the
   <maint:infData> element is formatted according to the
   maintenance-poll schema.

   Please see the defintion of <maint> elements in Section 2.3. 

   Example <poll> command:

   C:<?xml version="1.0" encoding="UTF-8" standalone="no"?>
   C:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
   C:  <command>
   C:  <poll op="req"/>
   C:    <clTRID>ABC-12345</clTRID>
   C:  </command>
   C:</epp>

   Example <poll> response with the Registry Maintenance poll message:

   S:<?xml version="1.0" encoding="UTF-8" standalone="no"?>
   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 count="1" id="12345">
   S:    <qDate>2020-10-08T22:10:00Z</qDate>
   S:    <msg lang="en">Registry Maintenance Notification</msg>
   S:  </msgQ>
   S:  <resData>
   S:    <maint:infData
   S:      xmlns:maint="urn:ietf:params:xml:ns:epp:maintenance-0.1">
   S:      <maint:item>
   S:        <maint:id>2e6df9b0-4092-4491-bcc8-9fb2166dcee6</maint:id>
   S:        <maint:systems>
   S:          <maint:system>
   S:            <maint:name>EPP</maint:name>
   S:            <maint:host>epp.registry.example
   S:            </maint:host>
   S:            <maint:impact>full</maint:impact>
   S:          </maint:system>
   S:        </maint:systems>
   S:        <maint:environment type="production"/>
   S:        <maint:start>2020-10-30T06:00:00Z</maint:start>
   S:        <maint:end>2020-10-30T14:25:57Z</maint:end>
   S:        <maint:reason>planned</maint:reason>

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   S:        <maint:detail>
   S:          https://www.registry.example/notice?123
   S:        </maint:detail>
   S:        <maint:tlds>
   S:          <maint:tld>example</maint:tld>
   S:          <maint:tld>test</maint:tld>
   S:        </maint:tlds>
   S:        <maint:intervention>
   S:          <maint:connection>false</maint:connection>
   S:          <maint:implementation>false</maint:implementation>
   S:        </maint:intervention>
   S:        <maint:crDate>2020-02-08T22:10:00Z</maint:crDate>
   S:      </maint:item>
   S:    </maint:infData>
   S:  </resData>
   S:  <trID>
   S:    <clTRID>ABC-12345</clTRID>
   S:    <svTRID>54321-XYZ</svTRID>
   S:  </trID>
   S:  </response>
   S:</epp>

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

   Create semantics do not apply to maintenance objects, so there is no
   mapping defined for the EPP <create> command.

3.2.2.  EPP <delete> Command

   Delete semantics do not apply to maintenance objects, so there is no
   mapping defined for the EPP <delete> command.

3.2.3.  EPP <renew> Command

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

3.2.4.  EPP <transfer> Command

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

3.2.5.  EPP <update> Command

   Update semantics do not apply to maintenance objects, so there is no
   mapping defined for the EPP <update> command.

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4.  Formal Syntax

   One schema is presented here that is the EPP Registry Maintenance
   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 end of the schema for URI
   registration purposes.

4.1.  Registry Maintenance EPP Mapping Schema

   BEGIN
   <?xml version="1.0" encoding="UTF-8"?>
     <schema targetNamespace="urn:ietf:params:xml:ns:epp:
       maintenance-0.1"
       xmlns:eppcom="urn:ietf:params:xml:ns:eppcom-1.0"
       xmlns:epp="urn:ietf:params:xml:ns:epp-1.0"
       xmlns:maint="urn:ietf:params:xml:ns:epp:maintenance-0.1"
       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
         Maintenance Mapping Schema.
       </documentation>
     </annotation>

     <!--
     Child elements found in EPP commands.
     -->
     <element name="info" type="maint:infoType"/>

     <!--
      Child elements of the <info> command.
     -->
     <complexType name="infoType">
       <sequence>
         <choice>
           <element name="list"/>
           <element name="id" type="maint:idType"/>
         </choice>
       </sequence>
     </complexType>

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     <!--
     Human-readable text may describe the maintenance
     -->
     <complexType name="idType">
       <simpleContent>
         <extension base="token">
           <attribute name="msg" type="token"/>
           <attribute name="lang" type="language" default="en"/>
         </extension>
       </simpleContent>
     </complexType>

     <!--
      Info Response element
     -->
     <element name="infData" type="maint:infDataType"/>

     <!--
      <info> response elements.
     -->
     <complexType name="infDataType">
       <choice>
         <element name="list" type="maint:listDataType"/>
         <element name="item" type="maint:maintDataType"/>
       </choice>
     </complexType>

     <!--
      Attributes associated with the list info response
     -->
     <complexType name="listDataType">
       <sequence>
         <element name="listItem" type="maint:maintItemType"
          minOccurs="0" maxOccurs="unbounded"/>
       </sequence>
     </complexType>

     <!--
      Attributes associated with the list item info response
     -->
     <complexType name="maintItemType">
       <sequence>
         <element name="id" type="maint:idType"/>
         <element name="start" type="dateTime" minOccurs="0"/>
         <element name="end" type="dateTime" minOccurs="0"/>
         <element name="crDate" type="dateTime"/>
         <element name="upDate" type="dateTime" minOccurs="0"/>
       </sequence>
     </complexType>

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     <!--
      Attributes associated with the maintenance info response
     -->
     <complexType name="maintDataType">
       <sequence>
         <element name="id" type="maint:idType"/>
         <element name="systems" type="maint:systemsType"/>
         <element name="environment" type="maint:envType"/>
         <element name="start" type="dateTime" minOccurs="0"/>
         <element name="end" type="dateTime" minOccurs="0"/>
         <element name="reason" type="maint:reasonEnum"/>
         <element name="detail" type="anyURI" minOccurs="0"/>
         <element name="description" type="maint:descriptionType"
          minOccurs="0"/>
         <element name="tlds" type="maint:tldsType" minOccurs="0"/>
         <element name="intervention" type="maint:interventionType"
          minOccurs="0"/>
         <element name="crDate" type="dateTime"/>
         <element name="upDate" type="dateTime" minOccurs="0"/>
       </sequence>
     </complexType>

     <!--
      systems element
     -->
     <complexType name="systemsType">
       <sequence>
         <element name="system" type="maint:systemType"
          maxOccurs="unbounded"/>
       </sequence>
     </complexType>

     <!--
      Enumerated list of impacts
     -->
     <simpleType name="impactEnum">
       <restriction base="token">
         <enumeration value="partial"/>
         <enumeration value="full"/>
       </restriction>
     </simpleType>

     <!--
      description element
     -->
     <complexType name="descriptionType">
       <simpleContent>
         <extension base="string">
           <attribute name="lang" type="language" default="en"/>
         </extension>
       </simpleContent>
     </complexType>

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     <!--
      system element
     -->
     <complexType name="systemType">
       <sequence>
         <element name="name" type="token"/>
         <element name="host" type="maint:addrType"/>
         <element name="impact" type="maint:impactEnum"/>
       </sequence>
     </complexType>

     <!--
      host element
     -->
     <complexType name="addrType">
       <simpleContent>
         <extension base="maint:addrStringType">
           <attribute name="ip" type="maint: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>

     <!--
      Enumerated list of environments
     -->
     <simpleType name="envEnum">
       <restriction base="token">
         <enumeration value="production"/>
         <enumeration value="ote"/>
         <enumeration value="staging"/>
         <enumeration value="dev"/>
         <enumeration value="custom"/>
       </restriction>
     </simpleType>

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     <!--
      environment element
     -->
     <complexType name="envType">
       <simpleContent>
         <extension base="token">
           <attribute name="type" type="maint:envEnum" use="required"/>
           <attribute name="name" type="token" use="optional"/>
         </extension>
       </simpleContent>
     </complexType>

     <!--
      Enumerated list of reasons
     -->
     <simpleType name="reasonEnum">
       <restriction base="token">
         <enumeration value="planned"/>
         <enumeration value="emergency"/>
       </restriction>
     </simpleType>

     <!--
      tlds element
     -->
     <complexType name="tldsType">
       <sequence>
         <element name="tld" type="eppcom:labelType"
          maxOccurs="unbounded"/>
       </sequence>
     </complexType>

     <!--
      intervention element
     -->
     <complexType name="interventionType">
       <sequence>
         <element name="connection" type="boolean"/>
         <element name="implementation" type="boolean"/>
       </sequence>
     </complexType>

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

5.  IANA Considerations

5.1.  XML Namespace

   This document uses URNs to describe XML namespaces and XML schemas
   conforming to a registry mechanism defined in [RFC3688].

   Registration request for the maintenance namespace:

      URI: urn:ietf:params:xml:ns:epp:maintenance-0.1

      Registrant Contact: IESG

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

   Registration request for the maintenance schema:

      URI: urn:ietf:params:xml:schema:maintenance-1.0

      Registrant Contact: IESG

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

5.2.  EPP Extension Registry

   The following registration of the EPP Extension Registry, described
   in [RFC7451], is requested:

   Name of Extension: "Registry Maintenance Notifications for the
   Extensible Provisioning Protocol (EPP)"

   Document status: Standards Track

   Reference: (insert the reference to RFC version of this document)

   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 specified by EPP [RFC5730] and
   protocol layers used by EPP. The security considerations described in
   these other specifications apply to this specification as well.

7.  Implementation Status

   Note to RFC Editor: Please remove this section and the reference to
   [RFC7942] before publication.

   This section records the status of known implementations of the
   protocol defined by this specification at the time of posting of this
   Internet-Draft, and is based on a proposal described in [RFC7942].
   The description of implementations in this section is intended to
   assist the IETF in its decision processes in progressing drafts to
   RFCs.  Please note that the listing of any individual implementation
   here does not imply endorsement by the IETF.  Furthermore, no effort
   has been spent to verify the information presented here that was
   supplied by IETF contributors.  This is not intended as, and must not
   be construed to be, a catalog of available implementations or their
   features.  Readers are advised to note that other implementations may
   exist.

   According to [RFC7942], "this will allow reviewers and working groups
   to assign due consideration to documents that have the benefit of
   running code, which may serve as evidence of valuable experimentation
   and feedback that have made the implemented protocols more mature. It
   is up to the individual working groups to use this information as
   they see fit".

7.1.  GoDaddy Registry

   Organization: GoDaddy Registry

   Name: GoDaddy Registry

   Description: GoDaddy Registry provides maintenance notifications to
   their registrars.

   Level of maturity: Production

   Coverage: All aspects of the protocol according to the draft version
   2 are implemented with further updates to come.

   Licensing: Proprietary

   Contact: quoc@registry.godaddy

   URL: https://registry.godaddy

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8.  References

8.1.  Normative References

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

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

8.2.  Informative References

   [RFC3339]  Klyne, G., Ed. and C. Newman, "Date and Time on the
              Internet: Timestamps", RFC 3339, July 2002,
              <https://www.rfc-editor.org/info/rfc3339>.

   [RFC5891]  Klensin, J., "Internationalized Domain Names in
              Applications (IDNA): Protocol", RFC 5891, August 2010,
              <https://www.rfc-editor.org/info/rfc5891>.

   [RFC5952]  Kawamura, S. and Kawashima, M., "A Recommendation for IPv6
              Address Text Representation", RFC 5952, August 2010,
              <https://www.rfc-editor.org/info/rfc5952>.

   [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>.

   [RFC7942]  Sheffer, Y. and Farrel, A., "Improving Awareness of
              Running Code: The Implementation Status Section", RFC
              7942, July 2016,
              <https://www.rfc-editor.org/info/rfc7942>.

Appendix A.  Change History

A.1.  Change from draft-sattler-epp-poll-maintenance-response to 
   draft-sattler-epp-registry-maintenance

   Updated to be EPP based instead of JSON document.

A.2.  Change from draft-sattler-epp-registry-maintenance to
   draft-ietf-regext-epp-registry-maintenance

   Adopted by the REGEXT working group.

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A.3.  Change from 00 to 01

   Clarified maint:description and maint:environment. Changed
   maint:description from complexType to simpleType. Fixed typo.
   Added acknowledgment.

A.4.  Change from 01 to 02

   Update language from Domain Name Registry to Registry. Clarified
   XML namespace urn:ietf:params:xml:ns:maintenance-1.0. Changed host
   to contain hostName and hostAddr. Changed maint:tlds from MUST to
   SHOULD. Fixed maint:status in Schema. Changed UUID to a server
   unique id.

A.5.  Change from 02 to 03

   Changed maint:connection from MUST to SHOULD.

A.6.  Change from 03 to 04

   A lot of clarifications and editoral changes.

A.7.  Change from 04 to 05

   Changed XML namespace from urn:ietf:params:xml:ns:maintenance-1.0 to
   urn:ietf:params:xml:ns:epp:maintenance-0.1. Removed <maint:status>.
   Clarified <maint:info> for retrieving maintenance items and the list.

A.8.  Change from 05 to 06

   Changed dates in examples to more recent dates. Renamed Query
   Maintenance Item and List to Info Maintenance Item and List. Removed
   blackout in favor of full. Added GoDaddy Registry implementation.

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Acknowledgments

   The authors wish to thank the following individuals for their
   feedback and suggestions (sorted alphabetically by company):

   o Patrick Mevzek
   o Anthony Eden, DNSimple
   o Christopher Martens, Donuts
   o Quoc-Anh Pham, GoDaddy Registry
   o Raymond Zylstra, GoDaddy Registry
   o Neal McPherson, IONOS
   o Andreas Huber, united-domains
   o Craig Marchant, VentraIP
   o James Gould, Verisign

Authors' Addresses

   Tobias Sattler

   Email: tobias.sattler@me.com
   URI:   https://tobiassattler.com

   Roger Carney
   GoDaddy Inc.
   14455 N. Hayden Rd. #219
   Scottsdale, AZ  85260
   US

   Email: rcarney@godaddy.com
   URI:   http://www.godaddy.com

   Jody Kolker
   GoDaddy Inc.
   14455 N. Hayden Rd. #219
   Scottsdale, AZ  85260
   US

   Email: jkolker@godaddy.com
   URI:   http://www.godaddy.com

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