ftp.cc.uoc.gr
rfc3730
This is a purely informative rendering of an RFC that includes verified errata. This rendering may not be used as a reference.

The following 'Verified' errata have been incorporated in this document: EID 239, EID 240
Network Working Group                                      S. Hollenbeck
Request for Comments: 3730                                VeriSign, Inc.
Category: Standards Track                                     March 2004


                 Extensible Provisioning Protocol (EPP)

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 application layer client-server protocol
   for the provisioning and management of objects stored in a shared
   central repository.  Specified in XML, the protocol defines generic
   object management operations and an extensible framework that maps
   protocol operations to objects.  This document includes a protocol
   specification, an object mapping template, and an XML media type
   registration.

Table of Contents

   1.  Introduction. . . . . . . . . . . . . . . . . . . . . . . . .   2
       1.1.  Conventions Used in This Document . . . . . . . . . . .   3
   2.  Protocol Description. . . . . . . . . . . . . . . . . . . . .   3
       2.1.  Transport Mapping Considerations. . . . . . . . . . . .   6
       2.2.  Protocol Identification . . . . . . . . . . . . . . . .   7
       2.3.  Hello Format. . . . . . . . . . . . . . . . . . . . . .   7
       2.4.  Greeting Format . . . . . . . . . . . . . . . . . . . .   8
       2.5.  Command Format. . . . . . . . . . . . . . . . . . . . .  11
       2.6.  Response Format . . . . . . . . . . . . . . . . . . . .  12
       2.7.  Protocol Extension Framework. . . . . . . . . . . . . .  16
             2.7.1.  Protocol Extension. . . . . . . . . . . . . . .  16
             2.7.2.  Object Extension. . . . . . . . . . . . . . . .  17
             2.7.3.  Command-Response Extension. . . . . . . . . . .  18
       2.8.  Object Identification . . . . . . . . . . . . . . . . .  19
       2.9.  Protocol Commands . . . . . . . . . . . . . . . . . . .  19
             2.9.1.  Session Management Commands . . . . . . . . . .  20
                     2.9.1.1.  EPP <login> Command . . . . . . . . .  20

                     2.9.1.2.  EPP <logout> Command. . . . . . . . .  22
             2.9.2.  Query Commands. . . . . . . . . . . . . . . . .  23
                     2.9.2.1.  EPP <check> Command . . . . . . . . .  24
                     2.9.2.2.  EPP <info> Command. . . . . . . . . .  26
                     2.9.2.3.  EPP <poll> Command. . . . . . . . . .  27
                     2.9.2.4.  EPP <transfer> Query Command. . . . .  32
             2.9.3.  Object Transform Commands . . . . . . . . . . .  34
                     2.9.3.1.  EPP <create> Command. . . . . . . . .  34
                     2.9.3.2.  EPP <delete> Command. . . . . . . . .  35
                     2.9.3.3.  EPP <renew> Command . . . . . . . . .  37
                     2.9.3.4.  EPP <transfer> Command. . . . . . . .  38
                     2.9.3.5.  EPP <update> Command. . . . . . . . .  41
   3.  Result Codes. . . . . . . . . . . . . . . . . . . . . . . . .  42
   4.  Formal Syntax . . . . . . . . . . . . . . . . . . . . . . . .  48
       4.1.  Base Schema . . . . . . . . . . . . . . . . . . . . . .  49
       4.2.  Shared Structure Schema . . . . . . . . . . . . . . . .  58
   5.  Internationalization Considerations . . . . . . . . . . . . .  60
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  61
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  62
   8.  Acknowledgements. . . . . . . . . . . . . . . . . . . . . . .  62
   9.  References. . . . . . . . . . . . . . . . . . . . . . . . . .  63
       9.1.  Normative References. . . . . . . . . . . . . . . . . .  63
       9.2.  Informative References. . . . . . . . . . . . . . . . .  64
   Appendix A: Object Mapping Template . . . . . . . . . . . . . . .  65
   Appendix B: Media Type Registration: application/epp+xml. . . . .  67
   Author's Address. . . . . . . . . . . . . . . . . . . . . . . . .  68
   Full Copyright Statement. . . . . . . . . . . . . . . . . . . . .  69

1.  Introduction

   Provide an introduction that describes the object and an overview of
   the mapping to EPP.

1.1.  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

   Describe the attributes associated with the object, including
   references to syntax specifications as appropriate.  Examples of
   object attributes include a name or identifier and dates associated
   with modification events.

2.1.  Transport Mapping Considerations

   As described previously, EPP can be layered over multiple transport
   protocols.  There are, however, a common set of considerations that
   MUST be addressed by any transport mapping defined for EPP.  These
   include:

   -  The transport mapping MUST preserve command order.

   -  The transport mapping MUST address the relationship between
      sessions and the client-server connection concept.

   -  The transport mapping MUST preserve the stateful nature of the
      protocol.

   -  The transport mapping MUST frame data units.

   -  The transport mapping MUST be onto a transport such as TCP
      [RFC793] or SCTP [RFC2960] that provides congestion avoidance that
      follows RFC 2914 [RFC2914], or if it maps onto a protocol such as
      SMTP [RFC2821] or BEEP [RFC3080], then the performance issues need
      to take into account issues of overload, server availability and
      so forth.

   -  The transport mapping MUST ensure reliability.

   -  The transport mapping MUST explicitly allow or prohibit
      pipelining.

   Pipelining, also known as command streaming, is when a client sends
   multiple commands to a server without waiting for each corresponding
   response.  After sending the commands, the client waits for the
   responses to arrive in the order corresponding to the completed
   commands.  Performance gains can sometimes be realized with
   pipelining, especially with high latency transports, but there are
   additional considerations associated with defining a transport
   mapping that supports pipelining:

   -  Commands MUST be processed independent of each other.

   -  Depending on the transport, pipelining MAY be possible in the form
      of sending a complete session in a well-defined "batch".

   -  The transport mapping MUST describe how an error in processing a
      command affects continued operation of the session.

   A transport mapping MUST explain how all of these requirements are
   met given the transport protocol being used to exchange data.

2.2.  Protocol Identification

   All EPP XML instances MUST begin with an <epp> element.  This element
   identifies the start of an EPP protocol element, the namespace used
   within the protocol, and the location of the protocol schema.  The
   <epp> start element and the associated </epp> ending element MUST be
   applied to all structures sent by both clients and servers.

   Example "start" and "end" EPP elements:

   <epp xmlns="urn:ietf:params:xml:ns:epp-1.0"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="urn:ietf:params:xml:ns:epp-1.0
        epp-1.0.xsd">
   </epp>

2.3.  Hello Format

   EPP MAY be carried over both connection-oriented and connection-less
   transport protocols.  An EPP client MAY request a <greeting> from an
   EPP server at any time by sending a <hello> to a server.  Use of this
   element is essential in a connection-less environment where a server
   can not return a <greeting> in response to a client-initiated
   connection.  An EPP <hello> MUST be an empty element with no child
   elements.

   Example <hello>:

   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:  <hello/>
   C:</epp>

2.4.  Greeting Format

   An EPP server responds to a successful connection and <hello> element
   by returning a <greeting> element to the client.  An EPP greeting
   contains the following elements:

   -  An <svID> element that contains the name of the server.

   -  An <svDate> element that contains the server's current date and
      time in UTC.

   -  An <svcMenu> element that identifies the services supported by the
      server, including:

   -  One or more <version> elements that identify the protocol versions
      supported by the server.

   -  One or more <lang> elements that contain the identifiers of the
      text response languages known by the server.  Language identifiers
      MUST be structured as documented in [RFC3066].

   -  One or more <objURI> elements that contain namespace URIs
      representing the objects that the server is capable of managing.
      A server MAY limit object management privileges on a per-client
      basis.

   -  An OPTIONAL <svcExtension> element that contains one or more
      <extURI> elements that contain namespace URIs representing object
      extensions supported by the server.

   -  A <dcp> (data collection policy) element that contains child
      elements used to describe the server's privacy policy for data
      collection and management.  Policy implications usually extend
      beyond the client-server relationship.  Both clients and servers
      can have relationships with other entities that need to know the
      server operator's data collection policy to make informed
      provisioning decisions.  Policy information MUST be disclosed to
      provisioning entities, though the method of disclosing policy data
      outside of direct protocol interaction is beyond the scope of this
      specification.  Child elements include the following:

   -  An <access> element that describes the access provided by the
      server to the client on behalf of the originating data source.
      The <access> element MUST contain one of the following child
      elements:

         <all/>: Access is given to all identified data.

         <none/>: No access is provided to identified data.

         <null/>: Data is not persistent, so no access is possible.

         <personal/>: Access is given to identified data relating to
         individuals and organizational entities.

         <personalAndOther/>: Access is given to identified data
         relating to individuals, organizational entities, and other
         data of a non-personal nature.

         <other/>: Access is given to other identified data of a non-
         personal nature.

   -  One or more <statement> elements that describe data collection
      purposes, data recipients, and data retention.  Each <statement>
      element MUST contain a <purpose> element, a <recipient> element,
      and a <retention> element.

   The <purpose> element MUST contain one or more of the following child
   elements that describe the purposes for which data is collected:

      <admin/>: Administrative purposes.  Information can be used for
      administrative and technical support of the provisioning system.

      <contact/>: Contact for marketing purposes.  Information can be
      used to contact individuals, through a communications channel
      other than the protocol, for the promotion of a product or
      service.

      <prov/>: Object provisioning purposes.  Information can be used to
      identify objects and inter-object relationships.

      <other/>: Other purposes.  Information may be used in other ways
      not captured by the above definitions.

      The <recipient> element MUST contain one or more of the following
      child elements that describes the recipients of collected data:

         <other/>: Other entities following unknown practices.

         <ours>: Server operator and/or entities acting as agents or
         entities for whom the server operator is acting as an agent.
         An agent in this instance is defined as a third party that
         processes data only on behalf of the service provider for the
         completion of the stated purposes.  The <ours> element contains
         an OPTIONAL <recDesc> element that can be used to describe the
         recipient.

         <public/>: Public forums.

         <same/>: Other entities following server practices.

         <unrelated/>: Unrelated third parties.

      The <retention> element MUST contain one of the following child
      elements that describes data retention practices:

         <business/>: Data persists per business practices.

         <indefinite/>: Data persists indefinitely.

         <legal/>: Data persists per legal requirements.

         <none/>: Data is not persistent, and is not retained for more
         than a brief period of time necessary to make use of it during
         the course of a single online interaction.

         <stated/>: Data persists to meet the stated purpose.

   -  An OPTIONAL <expiry> element that describes the lifetime of the
      policy.  The <expiry> element MUST contain one of the following
      child elements:

         <absolute/>: The policy is valid from the current date and time
         until it expires on the specified date and time.

         <relative/>: The policy is valid from the current date and time
         until the end of the specified duration.

   Data collection policy elements are based on work described in the
   World Wide Web Consortium's Platform for Privacy Preferences [P3P]
   specification.

   Example greeting:

   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:  <greeting>
   S:    <svID>Example EPP server epp.example.com</svID>
   S:    <svDate>2000-06-08T22:00:00.0Z</svDate>
   S:    <svcMenu>
   S:      <version>1.0</version>
   S:      <lang>en</lang>
   S:      <lang>fr</lang>
   S:      <objURI>urn:ietf:params:xml:ns:obj1</objURI>
   S:      <objURI>urn:ietf:params:xml:ns:obj2</objURI>
   S:      <objURI>urn:ietf:params:xml:ns:obj3</objURI>
   S:      <svcExtension>
   S:        <extURI>http://custom/obj1ext-1.0</extURI>
   S:      </svcExtension>
   S:    </svcMenu>
   S:    <dcp>
   S:      <access><all/></access>
   S:      <statement>
   S:        <purpose><admin/><prov/></purpose>
   S:        <recipient><ours/><public/></recipient>
   S:        <retention><stated/></retention>
   S:      </statement>
   S:    </dcp>
   S:  </greeting>
   S:</epp>

2.5.  Command Format

   An EPP client interacts with an EPP server by sending a command to
   the server and receiving a response from the server.  In addition to
   the standard EPP elements, an EPP command contains the following
   elements:

   -  A command element whose tag corresponds to one of the valid EPP
      commands described in this document.  The command element MAY
      contain either protocol-specified or object-specified child
      elements.

   -  An OPTIONAL <extension> element that MAY be used for server-
      defined command extensions.

   -  An OPTIONAL <clTRID> (client transaction identifier) element that
      MAY be used to uniquely identify the command to the client.
      Clients are responsible for maintaining their own transaction
      identifier space to ensure uniqueness.

   Example command with object-specified child elements:

   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:      <obj:info xmlns:obj="urn:ietf:params:xml:ns:obj"
   C:       xsi:schemaLocation="urn:ietf:params:xml:ns:obj obj.xsd">
   C:        <obj:name>example</obj:name>
   C:      </obj:info>
   C:    </info>
   C:    <clTRID>ABC-12345</clTRID>
   C:  </command>
   C:</epp>

2.6.  Response Format

   An EPP server responds to a client command by returning a response to
   the client.  EPP commands are atomic, so a command will either
   succeed completely or fail completely.  Success and failure results
   MUST NOT be mixed.  In addition to the standard EPP elements, an EPP
   response contains the following elements:

   -  One or more <result> elements that document the success or failure
      of command execution.  If the command was processed successfully,
      only one <result> element MUST be returned.  If the command was
      not processed successfully, multiple <result> elements MAY be
      returned to document failure conditions.  Each <result> element
      contains the following attribute and child elements:

      -  A "code" attribute whose value is a four-digit, decimal number
         that describes the success or failure of the command.

      -  A <msg> element containing a human-readable description of the
         response code.  The language of the response is identified via
         an OPTIONAL "lang" attribute.  If not specified, the default
         attribute value MUST be "en" (English).

      -  Zero or more OPTIONAL <value> elements that identify a client-
         provided element (including XML tag and value) that caused a
         server error condition.

      -  Zero or more OPTIONAL <extValue> elements that can be used to
         provide additional error diagnostic information, including:

         -  A <value> element that identifies a client-provided element
            (including XML tag and value) that caused a server error
            condition.

         -  A <reason> element containing a human-readable message that
            describes the reason for the error.  The language of the
            response is identified via an OPTIONAL "lang" attribute.  If
            not specified, the default attribute value MUST be "en"
            (English).

   -  An OPTIONAL <msgQ> element that describes messages queued for
      client retrieval.  A <msgQ> element MUST NOT be present if there
      are no messages queued for client retrieval.  A <msgQ> element MAY
      be present in responses to EPP commands other than the <poll>
      command if messages are queued for retrieval.  A <msgQ> element
      MUST be present in responses to the EPP <poll> command if messages
      are queued for retrieval.  The <msgQ> element contains the
      following attributes:

   -  A "count" attribute that describes the number of messages that
      exist in the queue.

   -  An "id" attribute used to uniquely identify the message at the
      head of the queue.

   The <msgQ> element contains the following OPTIONAL child elements
   that MUST be returned in response to a <poll> request command and
   MUST NOT be returned in response to any other command, including a
   <poll> acknowledgement:

   -  A <qDate> element that contains the date and time that the message
      was enqueued.

   -  A <msg> element containing a human-readable message.  The language
      of the response is identified via an OPTIONAL "lang" attribute.
      If not specified, the default attribute value MUST be "en"
      (English).  This element MAY contain XML content for formatting
      purposes, but the XML content is not specified by the protocol and
      will thus not be processed for validity.

   -  An OPTIONAL <resData> (response data) element that contains child
      elements specific to the command and associated object.

   -  An OPTIONAL <extension> element that MAY be used for server-
      defined response extensions.

   -  A <trID> (transaction identifier) element containing the
      transaction identifier assigned by the server to the command for
      which the response is being returned.  The transaction identifier
      is formed using the <clTRID> associated with the command if
      supplied by the client and a <svTRID> (server transaction
      identifier) that is assigned by and unique to the server.

      Transaction identifiers provide command-response synchronization
      integrity.  They SHOULD be logged, retained, and protected to
      ensure that both the client and the server have consistent
      temporal and state management records.

   Example response without <value> or <resData>:

   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 lang="en">Command completed successfully</msg>
   S:    </result>
   S:    <trID>
   S:      <clTRID>ABC-12345</clTRID>
   S:      <svTRID>54321-XYZ</svTRID>
   S:    </trID>
   S:  </response>
   S:</epp>

   Example response with <resData>:

   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:      <obj:creData xmlns:obj="urn:ietf:params:xml:ns:obj"
   S:       xsi:schemaLocation="urn:ietf:params:xml:ns:obj obj.xsd">
   S:        <obj:name>example</obj:name>
   S:      </obj:creData>
   S:    </resData>
   S:    <trID>
   S:      <clTRID>ABC-12345</clTRID>
   S:      <svTRID>54321-XYZ</svTRID>
   S:    </trID>
   S:  </response>
   S:</epp>

   Example response with error value elements:

   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="2004">
   S:      <msg>Parameter value range error</msg>
   S:      <value xmlns:obj="urn:ietf:params:xml:ns:obj">
   S:        <obj:elem1>2525</obj:elem1>
   S:      </value>
   S:    </result>
   S:    <result code="2005">
   S:      <msg>Parameter value syntax error</msg>
   S:      <value xmlns:obj="urn:ietf:params:xml:ns:obj">
   S:        <obj:elem2>ex(ample</obj:elem2>
   S:      </value>
   S:      <extValue>
   S:        <value xmlns:obj="urn:ietf:params:xml:ns:obj">
   S:          <obj:elem3>abc.ex(ample</obj:elem3>
   S:        </value>
   S:        <reason>Invalid character found.</reason>

   S:      </extValue>
   S:    </result>
   S:    <trID>
   S:      <clTRID>ABC-12345</clTRID>
   S:      <svTRID>54321-XYZ</svTRID>
   S:    </trID>
   S:  </response>
   S:</epp>

   Example response with notice of waiting server messages:

   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:    <msgQ count="5" id="12345"/>
   S:    <trID>
   S:      <clTRID>ABC-12345</clTRID>
   S:      <svTRID>54321-XYZ</svTRID>
   S:    </trID>
   S:  </response>
   S:</epp>

   Command success or failure MUST NOT be assumed if no response is
   returned or if a returned response is malformed.  Protocol
   idempotency ensures the safety of retrying a command in cases of
   response delivery failure.

2.7.  Protocol Extension Framework

   EPP provides an extension framework that allows features to be added
   at the protocol, object, and command-response levels.

2.7.1.  Protocol Extension

   The EPP extension framework allows for definition of new protocol
   elements identified using XML namespace notation with a reference to
   an XML schema that defines the namespace.  The <epp> element that
   identifies the beginning of a protocol instance includes multiple
   child element choices, one of which is an <extension> element whose
   children define the extension.  For example, a protocol extension
   element would be described in generic terms as follows:

   C:<epp>
   C:  <extension>
   C:    <!-- One or more extension elements. -->
   C:    <ext:foo xmlns:ext="urn:ietf:params:xml:ns:ext"
   C:     xsi:schemaLocation="urn:ietf:params:xml:ns:ext ext.xsd">
   C:      <!-- One or more extension child elements. -->
   C:    </ext:foo>
   C:  </extension>
   C:</epp>

   This document does not define mappings for specific extensions.
   Extension specifications MUST be described in separate documents that
   define the objects and operations subject to the extension.

2.7.2.  Object Extension

   EPP provides an extensible object management framework that defines
   the syntax and semantics of protocol operations applied to a managed
   object.  This framework pushes the definition of each protocol
   operation into the context of a specific object, providing the
   ability to add mappings for new objects without having to modify the
   base protocol.

   Protocol elements that contain data specific to objects are
   identified using XML namespace notation with a reference to an XML
   schema that defines the namespace.  The schema for EPP supports use
   of dynamic object schemas on a per-command and per-response basis.
   For example, the start of an object-specific command element would be
   described in generic terms as follows:

   C:<EPPCommandName>
   C:  <object:command xmlns:object="urn:ietf:params:xml:ns:object"
   C:   xsi:schemaLocation="urn:ietf:params:xml:ns:object object.xsd">
   C:    <!-- One or more object-specific command elements. -->
   C:  </object:command>
   C:</EPPCommandName>

   An object-specific response element would be described similarly:

   S:<resData>
   S:  <object:resData xmlns:object="urn:ietf:params:xml:ns:object"
   S:   xsi:schemaLocation="urn:ietf:params:xml:ns:object object.xsd">
   S:    <!-- One or more object-specific response elements. -->
   S:  </object:resData>
   S:</resData>

   This document does not define mappings for specific objects.  The
   mapping of EPP to an object MUST be described in separate documents
   that specifically address each command and response in the context of
   the object.  A suggested object mapping outline is included as an
   appendix to this document.

2.7.3.  Command-Response Extension

   EPP provides a facility for protocol command and response extensions.
   Protocol commands and responses MAY be extended by an <extension>
   element that contains additional elements whose syntax and semantics
   are not explicitly defined by EPP or an EPP object mapping.  This
   element is OPTIONAL.  Extensions are typically defined by agreement
   between client and server and MAY be used to extend EPP for unique
   operational needs.  A server-extended command element would be
   described in generic terms as follows:

   C:<command>
   C:  <!-- EPPCommandName can be "create", "update", etc. -->
   C:  <EPPCommandName>
   C:    <object:command xmlns:object="urn:ietf:params:xml:ns:object"
   C:     xsi:schemaLocation="urn:ietf:params:xml:ns:object object.xsd">
   C:      <!-- One or more object-specific command elements. -->
   C:    </object:command>
   C:  </EPPCommandName>
   C:  <extension>
   C:    <!-- One or more server-defined elements. -->
   C:  </extension>
   C:</command>

   An server-extended response element would be described similarly:

   S:<response>
   S:  <result code="1000">
   S:    <msg lang="en">Command completed successfully</msg>
   S:  </result>
   S:  <extension>
   S:    <!-- One or more server-defined elements. -->
   S:  </extension>
   S:  <trID>
   S:    <clTRID>ABC-12345</clTRID>
   S:    <svTRID>54321-XYZ</svTRID>
   S:  </trID>
   S:</response>

   This document does not define any specific server extensions.  The
   mapping of server extensions to EPP MUST be described in separate
   documents that specifically address extended commands and responses
   in the server's operational context.

2.8.  Object Identification

   Some objects, such as name servers and contacts, can have utility in
   multiple repositories.  However, maintaining disjoint copies of
   object information in multiple repositories can lead to
   inconsistencies that have adverse consequences for the Internet.  For
   example, changing a name server name in one repository, but not in a
   second repository that refers to the server for domain name
   delegation, can produce unexpected DNS query results.

   Globally unique identifiers can help facilitate object information
   sharing between repositories.  A globally unique identifier MUST be
   assigned to every object when the object is created; the identifier
   MUST be returned to the client as part of any request to retrieve the
   detailed attributes of an object.  Specific identifier values are a
   matter of repository policy, but they SHOULD be constructed according
   to the following algorithm:

   a) Divide the provisioning repository world into a number of object
      repository classes.

   b) Each repository within a class is assigned an identifier that is
      maintained by IANA.

   c) Each repository is responsible for assigning a unique local
      identifier for each object within the repository.

   d) The globally unique identifier is a concatenation of the local
      identifier, followed by a hyphen ("-", ASCII value 0x002D),
      followed by the repository identifier.

2.9.  Protocol Commands

   EPP provides commands to manage sessions, retrieve object
   information, and perform transformation operations on objects.  All
   EPP commands are atomic and designed so that they can be made
   idempotent, either succeeding completely or failing completely and
   producing predictable results in case of repeated execution.  This
   section describes each EPP command, including examples with
   representative server responses.

2.9.1.  Session Management Commands

   EPP provides two commands for session management: <login> to
   establish a session with a server, and <logout> to end a session with
   a server.  The <login> command establishes an ongoing server session
   that preserves client identity and authorization information during
   the duration of the session.

2.9.1.1.  EPP <login> Command

   The EPP <login> command is used to establish a session with an EPP
   server in response to a greeting issued by the server.  A <login>
   command MUST be sent to a server before any other EPP command to
   establish an ongoing session.  A server operator MAY limit the number
   of failed login attempts N, 1 <= N <= infinity, after which a login
   failure results in the connection to the server (if a connection
   exists) being closed.

   A client identifier and initial password MUST be created on the
   server before a client can successfully complete a <login> command.
   The client identifier and initial password MUST be delivered to the
   client using an out-of-band method that protects the identifier and
   password from inadvertent disclosure.

   In addition to the standard EPP command elements, the <login> command
   contains the following child elements:

   -  A <clID> element that contains the client identifier assigned to
      the client by the server.

   -  A <pw> element that contains the client's plain text password.
      The value of this element is case sensitive.

   -  An OPTIONAL <newPW> element that contains a new plain text
      password to be assigned to the client for use with subsequent
      <login> commands.  The value of this element is case sensitive.

   -  An <options> element that contains the following child elements:

      -  A <version> element that contains the protocol version to be
         used for the command or ongoing server session.

      -  A <lang> element that contains the text response language to be
         used for the command or ongoing server session commands.

   The values of the <version> and <lang> elements MUST exactly match
   one of the values presented in the EPP greeting.

   -  A <svcs> element that contains one or more <objURI> elements that
      contain namespace URIs representing the objects to be managed
      during the session.  The <svcs> element MAY contain an OPTIONAL
      <svcExtension> element that contains one or more <extURI> elements
      that identify object extensions to be used during the session.

   The PLAIN SASL mechanism presented in [RFC2595] describes a format
   for providing a user identifier, an authorization identifier, and a
   password as part of a single plain text string.  The EPP
   authentication mechanism is similar, though EPP does not require a
   session-level authorization identifier and the user identifier and
   password are separated into distinct XML elements.  Additional
   identification and authorization schemes MUST be provided at other
   protocol layers to provide more robust security services.

   Example <login> 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:    <login>
   C:      <clID>ClientX</clID>
   C:      <pw>foo-BAR2</pw>
   C:      <newPW>bar-FOO2</newPW>
   C:      <options>
   C:        <version>1.0</version>
   C:        <lang>en</lang>
   C:      </options>
   C:      <svcs>
   C:        <objURI>urn:ietf:params:xml:ns:obj1</objURI>
   C:        <objURI>urn:ietf:params:xml:ns:obj2</objURI>
   C:        <objURI>urn:ietf:params:xml:ns:obj3</objURI>
   C:        <svcExtension>
   C:          <extURI>http://custom/obj1ext-1.0</extURI>
   C:        </svcExtension>
   C:      </svcs>
   C:    </login>
   C:    <clTRID>ABC-12345</clTRID>
   C:  </command>
   C:</epp>

   When a <login> command has been processed successfully, a server MUST
   respond with an EPP response with no <resData> element.  If
   successful, the server will respond by creating and maintaining a new
   session that SHOULD be terminated by a future <logout> command.

   Example <login> 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>

   The EPP <login> command is used to establish a session with an EPP
   server.  A <login> command MUST be rejected if received within the
   bounds of an existing session.  This action MUST be open to all
   authorized clients.

2.9.1.2.  EPP <logout> Command

   The EPP <logout> command is used to end a session with an EPP server.
   The <logout> command MUST be represented as an empty element with no
   child elements.

   A server MAY end a session due to client inactivity or excessive
   client session longevity.  The parameters for determining excessive
   client inactivity or session longevity are a matter of server policy
   and are not specified by this protocol.

   Transport mappings MUST explicitly describe any connection-oriented
   processing that takes place after processing a <logout> command and
   ending a session.

   Example <logout> 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:    <logout/>
   C:    <clTRID>ABC-12345</clTRID>
   C:  </command>
   C:</epp>

   When a <logout> command has been processed successfully, a server
   MUST respond with an EPP response with no <resData> element.  If
   successful, the server MUST also end the current session.

   Example <logout> 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="1500">
   S:      <msg>Command completed successfully; ending session</msg>
   S:    </result>
   S:    <trID>
   S:      <clTRID>ABC-12345</clTRID>
   S:      <svTRID>54321-XYZ</svTRID>
   S:    </trID>
   S:  </response>
   S:</epp>

   The EPP <logout> command is used to end a session with an EPP server.
   A <logout> command MUST be rejected if the command has not been
   preceded by a successful <login> command.  This action MUST be open
   to all authorized clients.

2.9.2.  Query Commands

   EPP provides four commands to retrieve object information: <check> to
   determine if an object can be provisioned within a repository, <info>
   to retrieve detailed information associated with a known object,
   <poll> to receive service notifications from the server, and
   <transfer> to retrieve object transfer status information.

2.9.2.1.  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.

   The elements needed to identify an object are object-specific, so the
   child elements of the <check> command are specified using the EPP
   extension framework.  In addition to the standard EPP command
   elements, the <check> command contains the following child elements:

   -  An object-specific <obj:check> element that identify the objects
      to be queried.  Multiple objects of the same type MAY be queried
      within a single <check> command.

   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:      <obj:check xmlns:obj="urn:ietf:params:xml:ns:obj"
   C:       xsi:schemaLocation="urn:ietf:params:xml:ns:obj obj.xsd">
   C:        <obj:name>example1</obj:name>
   C:        <obj:name>example2</obj:name>
   C:        <obj:name>example3</obj:name>
   C:      </obj:check>
   C:    </check>
   C:    <clTRID>ABC-12346</clTRID>
   C:  </command>
   C:</epp>

   When a <check> command has been processed successfully, a server MUST
   respond with an EPP <resData> element that MUST contain a child
   element that identifies the object namespace and the location of the
   object schema.  The child elements of the <resData> element are
   object-specific, though the EPP <resData> element MUST contain a
   child <obj:chkData> element that contains one or more <obj:cd> (check
   data) elements.  Each <obj:cd> elements contains the following child
   elements:

   -  An object-specific element that identifies the queried 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.

   -  An OPTIONAL <obj: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:      <obj:chkData xmlns:obj="urn:ietf:params:xml:ns:obj"
   S:       xsi:schemaLocation="urn:ietf:params:xml:ns:obj obj.xsd">
   S:        <obj:cd>
   S:          <obj:name avail="1">example1</obj:name>
   S:        </obj:cd>
   S:        <obj:cd>
   S:          <obj:name avail="0">example2</obj:name>
   S:          <obj:reason>In use</obj:reason>
   S:        </obj:cd>
   S:        <obj:cd>
   S:          <obj:name avail="1">example3</obj:name>
   S:        </obj:cd>
   S:      </obj:chkData>
   S:    </resData>
   S:    <trID>
   S:      <clTRID>ABC-12346</clTRID>
   S:      <svTRID>54322-XYZ</svTRID>
   S:    </trID>
   S:  </response>
   S:</epp>

   The EPP <check> command is used to determine if an object can be
   provisioned within a repository.  This action MUST be open to all
   authorized clients.

2.9.2.2.  EPP <info> Command

   The EPP <info> command is used to retrieve information associated
   with an existing object.  The elements needed to identify an object
   and the type of information associated with an object are both
   object-specific, so the child elements of the <info> command are
   specified using the EPP extension framework.  In addition to the
   standard EPP command elements, the <info> command contains the
   following child elements:

   -  An object-specific <obj:info> element that identifies the object
      to be queried.

   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:      <obj:info xmlns:obj="urn:ietf:params:xml:ns:obj"
   C:       xsi:schemaLocation="urn:ietf:params:xml:ns:obj obj.xsd">
   C:        <!-- Object-specific elements. -->
   C:      </obj:info>
   C:    </info>
   C:    <clTRID>ABC-12346</clTRID>
   C:  </command>
   C:</epp>

   When an <info> command has been processed successfully, a server MUST
   respond with an EPP <resData> element that MUST contain a child
   element that identifies the object namespace and the location of the
   object schema and the Repository Object Identifier (ROID) that was
   assigned to the object when the object was created.  Other child
   elements of the <resData> element are object-specific.

   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:      <obj:infData xmlns:obj="urn:ietf:params:xml:ns:obj"
   S:       xsi:schemaLocation="urn:ietf:params:xml:ns:obj obj.xsd">
   S:        <obj:roid>EXAMPLE1-REP</obj:roid>
   S:        <!-- Object-specific elements. -->
   S:      </obj:infData>
   S:    </resData>
   S:    <trID>
   S:      <clTRID>ABC-12346</clTRID>
   S:      <svTRID>54322-XYZ</svTRID>
   S:    </trID>
   S:  </response>
   S:</epp>

   The EPP <info> command is used to retrieve information associated
   with an existing object.  This action SHOULD be limited to authorized
   clients; restricting this action to the sponsoring client is
   RECOMMENDED.

2.9.2.3.  EPP <poll> Command

   The EPP <poll> command is used to discover and retrieve service
   messages queued by a server for individual clients.  If the message
   queue is not empty, a successful response to a <poll> command MUST
   return the first message from the message queue.  Each response
   returned from the server includes a server-unique message identifier
   that MUST be provided to acknowledge receipt of the message, and a
   counter that indicates the number of messages in the queue.  After a
   message has been received by the client, the client MUST respond to
   the message with an explicit acknowledgement to confirm that the
   message has been received.  A server MUST dequeue the message and
   decrement the queue counter after receiving acknowledgement from the
   client, making the next message in the queue (if any) available for
   retrieval.

   Servers can occasionally perform actions on objects that are not in
   direct response to a client request, or an action taken by one client
   can indirectly involve a second client.  Examples of such actions
   include deletion upon expiration, automatic renewal upon expiration,
   and transfer coordination; other types of service information MAY be
   defined as a matter of server policy.  Service messages MUST be
   created for all clients affected by an action on an object.  For
   example, <transfer> actions MUST be reported to both the client that
   requests an object transfer and the client that has the authority to
   approve or reject the transfer request.

   Message queues can consume server resources if clients do not
   retrieve and acknowledge messages on a regular basis.  Servers MAY
   implement other mechanisms to dequeue and deliver messages if queue
   maintenance needs exceed server resource consumption limits.  Server
   operators SHOULD consider time-sensitivity and resource management
   factors when selecting a delivery method for service information
   because some message types can be reasonably delivered using non-
   protocol methods that require fewer server resources.

   Some of the information returned in response to a <poll> command can
   be object-specific, so some child elements of the <poll> response MAY
   be specified using the EPP extension framework.  The <poll> command
   MUST be represented as an empty element with no child elements.  An
   "op" attribute with value "req" is REQUIRED to retrieve the first
   message from the server message queue.  An "op" attribute (with value
   "ack") and a "msgID" attribute (whose value corresponds to the value
   of the "id" attribute copied from the <msg> element in the message
   being acknowledged) are REQUIRED to acknowledge receipt of a message.

   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:     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:    <poll op="req"/>
   C:    <clTRID>ABC-12345</clTRID>
   C:  </command>
   C:</epp>

   The returned result code notes that a message has been dequeued and
   returned in response to a <poll> command.

   Example <poll> response with object-specific information:

   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>2000-06-08T22:00:00.0Z</qDate>
   S:      <msg>Transfer requested.</msg>
   S:    </msgQ>
   S:    <resData>
   S:      <obj:trnData
   S:       xmlns:obj="urn:ietf:params:xml:ns:obj-1.0"
   S:       xsi:schemaLocation="urn:ietf:params:xml:ns:obj-1.0
   S:       obj-1.0.xsd">
   S:        <obj:name>example.com</obj:name>
   S:        <obj:trStatus>pending</obj:trStatus>
   S:        <obj:reID>ClientX</obj:reID>
   S:        <obj:reDate>2000-06-08T22:00:00.0Z</obj:reDate>
   S:        <obj:acID>ClientY</obj:acID>
   S:        <obj:acDate>2000-06-13T22:00:00.0Z</obj:acDate>
   S:        <obj:exDate>2002-09-08T22:00:00.0Z</obj:exDate>
   S:      </obj:trnData>
   S:    </resData>
   S:    <trID>
   S:      <clTRID>ABC-12345</clTRID>
   S:      <svTRID>54321-XYZ</svTRID>
   S:    </trID>
   S:  </response>
   S:</epp>

   A client MUST acknowledge each response to dequeue the message and
   make subsequent messages available for retrieval.

   Example <poll> acknowledgement 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:    <poll op="ack" msgID="12345"/>
   C:    <clTRID>ABC-12346</clTRID>
   C:  </command>
   C:</epp>

   A <poll> acknowledgement response notes the ID of the message that has been 
acknowledged and the number of messages remaining in the queue.
EID 240 (Verified) is as follows:

Section: 2.9.2.3

Original Text:

A <poll> acknowledgement response notes the number of messages remaining in
the queue and the ID of the next message available for retrieval.

Corrected Text:

A <poll> acknowledgement response notes the ID of the message that has been
acknowledged and the number of messages remaining in the queue.
Notes:
Example <poll> acknowledgement 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: <msgQ count="4" id="12345"/>
EID 239 (Verified) is as follows:

Section: 2.9.2.3

Original Text:

S:    <msgQ count="4" id="12346"/>

Corrected Text:

S:    <msgQ count="4" id="12345"/>
Notes:
Author knows the best :-).
S: <trID> S: <clTRID>ABC-12346</clTRID> S: <svTRID>54322-XYZ</svTRID> S: </trID> S: </response> S:</epp> Service messages can also be returned without object information. Example <poll> response with mixed message content and without object-specific information: 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="4" id="12346"> S: <qDate>2000-06-08T22:10:00.0Z</qDate> S: <msg lang="en">Credit balance low. S: <limit>100</limit><bal>5</bal> S: </msg> S: </msgQ> S: <trID> S: <clTRID>ABC-12346</clTRID> S: <svTRID>54321-XYZ</svTRID> S: </trID> S: </response> S:</epp> The returned result code and message is used to note an empty server message queue. Example <poll> response to note an empty message queue: 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="1300"> S: <msg>Command completed successfully; no messages</msg> S: </result> S: <trID> S: <clTRID>ABC-12346</clTRID> S: <svTRID>54321-XYZ</svTRID> S: </trID> S: </response> S:</epp> The EPP <poll> command is used to discover and retrieve client service messages from a server. This action SHOULD be limited to authorized clients; queuing service messages and limiting queue access on a per-client basis is RECOMMENDED. 2.9.2.4. EPP <transfer> Query Command The EPP <transfer> command provides a query operation that allows a client to determine real-time status of pending and completed transfer requests. The elements needed to identify an object that is the subject of a transfer request are object-specific, so the child elements of the <transfer> query command are specified using the EPP extension framework. In addition to the standard EPP command elements, the <transfer> command contains an "op" attribute with value "query", and the following child elements: - An object-specific <obj:transfer> element that identifies the object whose transfer status is requested. Transfer status is typically considered sensitive information by the clients involved in the operation. Object mappings MUST provide features to restrict transfer queries to authorized clients, such as by requiring authorization information as part of the request. Example <transfer> query 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: <transfer op="query"> C: <obj:transfer xmlns:obj="urn:ietf:params:xml:ns:obj" C: xsi:schemaLocation="urn:ietf:params:xml:ns:obj obj.xsd"> C: <!-- Object-specific elements. --> C: </obj:transfer> C: </transfer> C: <clTRID>ABC-12346</clTRID> C: </command> C:</epp> When a <transfer> query command has been processed successfully, a server MUST respond with an EPP <resData> element that MUST contain a child element that identifies the object namespace and the location of the object schema. The child elements of the <resData> element are object-specific, but they MUST include elements that identify the object, the status of the transfer, the identifier of the client that requested the transfer, the date and time that the request was made, the identifier of the client that is authorized to act on the request, the date and time by which an action is expected, and an OPTIONAL date and time noting changes in the object's validity period (if applicable) that occur as a result of the transfer. Example <transfer> query 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: <obj:trnData xmlns:obj="urn:ietf:params:xml:ns:obj" S: xsi:schemaLocation="urn:ietf:params:xml:ns:obj obj.xsd"> S: <obj:name>example</obj:name> S: <obj:trStatus>pending</obj:trStatus> S: <obj:reID>ClientX</obj:reID> S: <obj:reDate>2000-06-08T22:00:00.0Z</obj:reDate> S: <obj:acID>ClientY</obj:acID> S: <obj:acDate>2000-06-13T22:00:00.0Z</obj:acDate> S: <obj:exDate>2002-09-08T22:00:00.0Z</obj:exDate> S: </obj:trnData> S: </resData> S: <trID> S: <clTRID>ABC-12346</clTRID> S: <svTRID>54322-XYZ</svTRID> S: </trID> S: </response> S:</epp> The EPP <transfer> command provides a query operation that allows a client to determine real-time status of pending and completed transfer requests. This action SHOULD be limited to authorized clients; restricting queries to the requesting and responding clients is RECOMMENDED. Object transfer MAY be unavailable or limited by object-specific policies. 2.9.3. Object Transform Commands EPP provides five commands to transform objects: <create> to create an instance of an object with a server, <delete> to remove an instance of an object from a server, <renew> to extend the validity period of an object, <update> to change information associated with an object, and <transfer> to manage changes in client sponsorship of an object. 2.9.3.1. EPP <create> Command The EPP <create> command is used to create an instance of an object. An object can be created for an indefinite period of time, or an object can be created for a specific validity period. The EPP mapping for an object MUST describe the status of an object with respect to time, to include expected client and server behavior if a validity period is used. The elements needed to identify an object and associated attributes are object-specific, so the child elements of the <create> command are specified using the EPP extension framework. In addition to the standard EPP command elements, the <create> command contains the following child elements: - An object-specific <obj:create> element that identifies the object to be created and the elements that are required to create the object. 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: <obj:create xmlns:obj="urn:ietf:params:xml:ns:obj" C: xsi:schemaLocation="urn:ietf:params:xml:ns:obj obj.xsd"> C: <!-- Object-specific elements. --> C: </obj:create> C: </create> C: <clTRID>ABC-12345</clTRID> C: </command> C:</epp> When a <create> command has been processed successfully, a server MAY respond with an EPP <resData> element that MUST contain a child element that identifies the object namespace and the location of the object schema. The child elements of the <resData> element are object-specific. Example <create> response with <resData>: 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: <obj:creData xmlns:obj="urn:ietf:params:xml:ns:obj" S: xsi:schemaLocation="urn:ietf:params:xml:ns:obj obj.xsd"> S: <!-- Object-specific elements. --> S: </obj:creData> S: </resData> S: <trID> S: <clTRID>ABC-12345</clTRID> S: <svTRID>54321-XYZ</svTRID> S: </trID> S: </response> S:</epp> The EPP <create> command is used to create an instance of an object. This action SHOULD be limited to authorized clients and MAY be restricted on a per-client basis. 2.9.3.2. EPP <delete> Command The EPP <delete> command is used to remove an instance of an existing object. The elements needed to identify an object are object- specific, so the child elements of the <delete> command are specified using the EPP extension framework. In addition to the standard EPP command elements, the <delete> command contains the following child elements: - An object-specific <obj:delete> element that identifies the object to be deleted. 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"> C: <command> C: <delete> C: <obj:delete xmlns:obj="urn:ietf:params:xml:ns:obj" C: xsi:schemaLocation="urn:ietf:params:xml:ns:obj obj.xsd"> C: <!-- Object-specific elements. --> C: </obj:delete> C: </delete> C: <clTRID>ABC-12346</clTRID> C: </command> C:</epp> When a <delete> command has been processed successfully, a server MAY respond with an EPP <resData> element that MUST contain a child element that identifies the object namespace and the location of the object schema. The child elements of the <resData> element are object-specific. Example <delete> response without <resData>: 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-12346</clTRID> S: <svTRID>54322-XYZ</svTRID> S: </trID> S: </response> S:</epp> The EPP <delete> command is used to remove an instance of an existing object. This action SHOULD be limited to authorized clients; restricting this action to the sponsoring client is RECOMMENDED. 2.9.3.3. EPP <renew> Command The EPP <renew> command is used to extend the validity period of an existing object. The elements needed to identify and extend the validity period of an object are object-specific, so the child elements of the <renew> command are specified using the EPP extension framework. In addition to the standard EPP command elements, the <renew> command contains the following child elements: - An object-specific <obj:renew> element that identifies the object to be renewed and the elements that are required to extend the validity period of the object. Example <renew> 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: <renew> C: <obj:renew xmlns:obj="urn:ietf:params:xml:ns:obj" C: xsi:schemaLocation="urn:ietf:params:xml:ns:obj obj.xsd"> C: <!-- Object-specific elements. --> C: </obj:renew> C: </renew> C: <clTRID>ABC-12346</clTRID> C: </command> C:</epp> When a <renew> command has been processed successfully, a server MAY respond with an EPP <resData> element that MUST contain a child element that identifies the object namespace and the location of the object schema. The child elements of the <resData> element are object-specific. Example <renew> response with <resData>: 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: <obj:renData xmlns:obj="urn:ietf:params:xml:ns:obj" S: xsi:schemaLocation="urn:ietf:params:xml:ns:obj obj.xsd"> S: <!-- Object-specific elements. --> S: </obj:renData> S: </resData> S: <trID> S: <clTRID>ABC-12346</clTRID> S: <svTRID>54322-XYZ</svTRID> S: </trID> S: </response> S:</epp> The EPP <renew> command is used to extend the validity period of an existing object. This action SHOULD be limited to authorized clients; restricting this action to the sponsoring client is RECOMMENDED. Object renewal MAY be unavailable or limited by object-specific policies. 2.9.3.4. EPP <transfer> Command The EPP <transfer> command is used to manage changes in client sponsorship of an existing object. Clients can initiate a transfer request, cancel a transfer request, approve a transfer request, and reject a transfer request using the "op" command attribute. A client who wishes to assume sponsorship of a known object from another client uses the <transfer> command with the value of the "op" attribute set to "request". Once a transfer has been requested, the same client can cancel the request using a <transfer> command with the value of the "op" attribute set to "cancel". A request to cancel the transfer MUST be sent to the server before the current sponsoring client either approves or rejects the transfer request and before the server automatically processes the request due to responding client inactivity. Once a transfer request has been received by the server, the server MUST notify the current sponsoring client of the requested transfer by queuing a service message for retrieval via the <poll> command. The current status of a pending <transfer> command for any object can be found using the <transfer> query command. Transfer service messages MUST include the object-specific elements specified for <transfer> command responses. The current sponsoring client MAY explicitly approve or reject the transfer request. The client can approve the request using a <transfer> command with the value of the "op" attribute set to "approve". The client can reject the request using a <transfer> command with the value of the "op" attribute set to "reject". A server MAY automatically approve or reject all transfer requests that are not explicitly approved or rejected by the current sponsoring client within a fixed amount of time. The amount of time to wait for explicit action and the default server behavior are local matters not specified by EPP, but they SHOULD be documented in a server-specific profile document that describes default server behavior for client information. Objects eligible for transfer MUST have associated authorization information that MUST be provided to complete a <transfer> command. The type of authorization information required is object-specific; passwords or more complex mechanisms based on public key cryptography are typical. The elements needed to identify and complete the transfer of an object are object-specific, so the child elements of the <transfer> command are specified using the EPP extension framework. In addition to the standard EPP command elements, the <transfer> command contains the following child elements: - An object-specific <obj:transfer> element that identifies the object to be transferred and the elements that are required to process the transfer command. Example <transfer> 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: <transfer op="request"> C: <obj:transfer xmlns:obj="urn:ietf:params:xml:ns:obj" C: xsi:schemaLocation="urn:ietf:params:xml:ns:obj obj.xsd"> C: <!-- Object-specific elements. --> C: </obj:transfer> C: </transfer> C: <clTRID>ABC-12346</clTRID> C: </command> C:</epp> When a <transfer> command has been processed successfully, a server MUST respond with an EPP <resData> element that MUST contain a child element that identifies the object namespace and the location of the object schema. The child elements of the <resData> element are object-specific, but they MUST include elements that identify the object, the status of the transfer, the identifier of the client that requested the transfer, the date and time that the request was made, the identifier of the client that is authorized to act on the request, the date and time by which an action is expected, and an OPTIONAL date and time noting changes in the object's validity period (if applicable) that occur as a result of the transfer. Example <transfer> response with <resData>: 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: <obj:trnData xmlns:obj="urn:ietf:params:xml:ns:obj" S: xsi:schemaLocation="urn:ietf:params:xml:ns:obj obj.xsd"> S: <obj:name>example</obj:name> S: <obj:trStatus>pending</obj:trStatus> S: <obj:reID>ClientX</obj:reID> S: <obj:reDate>2000-06-08T22:00:00.0Z</obj:reDate> S: <obj:acID>ClientY</obj:acID> S: <obj:acDate>2000-06-13T22:00:00.0Z</obj:acDate> S: <obj:exDate>2002-09-08T22:00:00.0Z</obj:exDate> S: </obj:trnData> S: </resData> S: <trID> S: <clTRID>ABC-12346</clTRID> S: <svTRID>54322-XYZ</svTRID> S: </trID> S: </response> S:</epp> The EPP <transfer> command is used to manage changes in client sponsorship of an existing object. This action SHOULD be limited to authorized clients; restricting <transfer> requests to a client other than the current sponsoring client, <transfer> approval requests to the current sponsoring client, and <transfer> cancellation requests to the original requesting client is RECOMMENDED. Object transfer MAY be unavailable or limited by object-specific policies. 2.9.3.5. EPP <update> Command The EPP <update> command is used to change information associated with an existing object. The elements needed to identify and modify an object are object-specific, so the child elements of the <update> command are specified using the EPP extension framework. In addition to the standard EPP command elements, the <update> command contains the following child elements: - An object-specific <obj:update> element that identifies the object to be updated and the elements that are required to modify the object. Object-specific elements MUST identify values to be added, values to be removed, or values to be changed. 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: <obj:update xmlns:obj="urn:ietf:params:xml:ns:obj" C: xsi:schemaLocation="urn:ietf:params:xml:ns:obj obj.xsd"> C: <!-- Object-specific elements. --> C: </obj:update> C: </update> C: <clTRID>ABC-12346</clTRID> C: </command> C:</epp> When an <update> command has been processed successfully, a server MAY respond with an EPP <resData> element that MUST contain a child element that identifies the object namespace and the location of the object schema. The child elements of the <resData> element are object-specific. Example <update> response without <resData>: 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-12346</clTRID> S: <svTRID>54322-XYZ</svTRID> S: </trID> S: </response> S:</epp> The EPP <update> command is used to change information associated with an existing object. This action SHOULD be limited to authorized clients; restricting this action to the sponsoring client is RECOMMENDED. 3. EPP Command Mapping 4. Formal Syntax Provide the XML schema for the object mapping. An XML DTD MUST NOT be used as DTDs do not provide sufficient support for XML namespaces and strong data typing. 4.1. Base Schema BEGIN <?xml version="1.0" encoding="UTF-8"?> <schema targetNamespace="urn:ietf:params:xml:ns:epp-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"/> <annotation> <documentation> Extensible Provisioning Protocol v1.0 schema. </documentation> </annotation> <!-- Every EPP XML instance must begin with this element. --> <element name="epp" type="epp:eppType"/> <!-- An EPP XML instance must contain a greeting, hello, command, response, or extension. --> <complexType name="eppType"> <choice> <element name="greeting" type="epp:greetingType"/> <element name="hello"/> <element name="command" type="epp:commandType"/> <element name="response" type="epp:responseType"/> <element name="extension" type="epp:extAnyType"/> </choice> </complexType> <!-- A greeting is sent by a server in response to a client connection or <hello>. --> <complexType name="greetingType"> <sequence> <element name="svID" type="epp:sIDType"/> <element name="svDate" type="dateTime"/> <element name="svcMenu" type="epp:svcMenuType"/> <element name="dcp" type="epp:dcpType"/> </sequence> </complexType> <!-- Server IDs are strings with minimum and maximum length restrictions. --> <simpleType name="sIDType"> <restriction base="normalizedString"> <minLength value="3"/> <maxLength value="64"/> </restriction> </simpleType> <!-- A server greeting identifies available object services. --> <complexType name="svcMenuType"> <sequence> <element name="version" type="epp:versionType" maxOccurs="unbounded"/> <element name="lang" type="language" maxOccurs="unbounded"/> <element name="objURI" type="anyURI" maxOccurs="unbounded"/> <element name="svcExtension" type="epp:extURIType" minOccurs="0"/> </sequence> </complexType> <!-- Data Collection Policy types. --> <complexType name="dcpType"> <sequence> <element name="access" type="epp:dcpAccessType"/> <element name="statement" type="epp:dcpStatementType" maxOccurs="unbounded"/> <element name="expiry" type="epp:dcpExpiryType" minOccurs="0"/> </sequence> </complexType> <complexType name="dcpAccessType"> <choice> <element name="all"/> <element name="none"/> <element name="null"/> <element name="other"/> <element name="personal"/> <element name="personalAndOther"/> </choice> </complexType> <complexType name="dcpStatementType"> <sequence> <element name="purpose" type="epp:dcpPurposeType"/> <element name="recipient" type="epp:dcpRecipientType"/> <element name="retention" type="epp:dcpRetentionType"/> </sequence> </complexType> <complexType name="dcpPurposeType"> <sequence> <element name="admin" minOccurs="0"/> <element name="contact" minOccurs="0"/> <element name="other" minOccurs="0"/> <element name="prov" minOccurs="0"/> </sequence> </complexType> <complexType name="dcpRecipientType"> <sequence> <element name="other" minOccurs="0"/> <element name="ours" type="epp:dcpOursType" minOccurs="0" maxOccurs="unbounded"/> <element name="public" minOccurs="0"/> <element name="same" minOccurs="0"/> <element name="unrelated" minOccurs="0"/> </sequence> </complexType> <complexType name="dcpOursType"> <sequence> <element name="recDesc" type="epp:dcpRecDescType" minOccurs="0"/> </sequence> </complexType> <simpleType name="dcpRecDescType"> <restriction base="token"> <minLength value="1"/> <maxLength value="255"/> </restriction> </simpleType> <complexType name="dcpRetentionType"> <choice> <element name="business"/> <element name="indefinite"/> <element name="legal"/> <element name="none"/> <element name="stated"/> </choice> </complexType> <complexType name="dcpExpiryType"> <choice> <element name="absolute" type="dateTime"/> <element name="relative" type="duration"/> </choice> </complexType> <!-- Extension framework types. --> <complexType name="extAnyType"> <sequence> <any namespace="##other" maxOccurs="unbounded"/> </sequence> </complexType> <complexType name="extURIType"> <sequence> <element name="extURI" type="anyURI" maxOccurs="unbounded"/> </sequence> </complexType> <!-- An EPP version number is a dotted pair of decimal numbers. --> <simpleType name="versionType"> <restriction base="token"> <pattern value="[1-9]+\.[0-9]+"/> <enumeration value="1.0"/> </restriction> </simpleType> <!-- Command types. --> <complexType name="commandType"> <sequence> <choice> <element name="check" type="epp:readWriteType"/> <element name="create" type="epp:readWriteType"/> <element name="delete" type="epp:readWriteType"/> <element name="info" type="epp:readWriteType"/> <element name="login" type="epp:loginType"/> <element name="logout"/> <element name="poll" type="epp:pollType"/> <element name="renew" type="epp:readWriteType"/> <element name="transfer" type="epp:transferType"/> <element name="update" type="epp:readWriteType"/> </choice> <element name="extension" type="epp:extAnyType" minOccurs="0"/> <element name="clTRID" type="epp:trIDStringType" minOccurs="0"/> </sequence> </complexType> <!-- The <login> command. --> <complexType name="loginType"> <sequence> <element name="clID" type="eppcom:clIDType"/> <element name="pw" type="epp:pwType"/> <element name="newPW" type="epp:pwType" minOccurs="0"/> <element name="options" type="epp:credsOptionsType"/> <element name="svcs" type="epp:loginSvcType"/> </sequence> </complexType> <complexType name="credsOptionsType"> <sequence> <element name="version" type="epp:versionType"/> <element name="lang" type="language"/> </sequence> </complexType> <simpleType name="pwType"> <restriction base="token"> <minLength value="6"/> <maxLength value="16"/> </restriction> </simpleType> <complexType name="loginSvcType"> <sequence> <element name="objURI" type="anyURI" maxOccurs="unbounded"/> <element name="svcExtension" type="epp:extURIType" minOccurs="0"/> </sequence> </complexType> <!-- The <poll> command. --> <complexType name="pollType"> <attribute name="op" type="epp:pollOpType" use="required"/> <attribute name="msgID" type="token"/> </complexType> <simpleType name="pollOpType"> <restriction base="token"> <enumeration value="ack"/> <enumeration value="req"/> </restriction> </simpleType> <!-- The <transfer> command. This is object-specific, and uses attributes to identify the requested operation. --> <complexType name="transferType"> <sequence> <any namespace="##other"/> </sequence> <attribute name="op" type="epp:transferOpType" use="required"/> </complexType> <simpleType name="transferOpType"> <restriction base="token"> <enumeration value="approve"/> <enumeration value="cancel"/> <enumeration value="query"/> <enumeration value="reject"/> <enumeration value="request"/> </restriction> </simpleType> <!-- All other object-centric commands. EPP doesn't specify the syntax or semantics of object-centric command elements. The elements MUST be described in detail in another schema specific to the object. --> <complexType name="readWriteType"> <sequence> <any namespace="##other"/> </sequence> </complexType> <complexType name="trIDType"> <sequence> <element name="clTRID" type="epp:trIDStringType" minOccurs="0"/> <element name="svTRID" type="epp:trIDStringType"/> </sequence> </complexType> <simpleType name="trIDStringType"> <restriction base="token"> <minLength value="3"/> <maxLength value="64"/> </restriction> </simpleType> <!-- Response types. --> <complexType name="responseType"> <sequence> <element name="result" type="epp:resultType" maxOccurs="unbounded"/> <element name="msgQ" type="epp:msgQType" minOccurs="0"/> <element name="resData" type="epp:extAnyType" minOccurs="0"/> <element name="extension" type="epp:extAnyType" minOccurs="0"/> <element name="trID" type="epp:trIDType"/> </sequence> </complexType> <complexType name="resultType"> <sequence> <element name="msg" type="epp:msgType"/> <choice minOccurs="0" maxOccurs="unbounded"> <element name="value" type="epp:errValueType"/> <element name="extValue" type="epp:extErrValueType"/> </choice> </sequence> <attribute name="code" type="epp:resultCodeType" use="required"/> </complexType> <complexType name="errValueType" mixed="true"> <sequence> <any namespace="##any" processContents="skip"/> </sequence> <anyAttribute namespace="##any" processContents="skip"/> </complexType> <complexType name="extErrValueType"> <sequence> <element name="value" type="epp:errValueType"/> <element name="reason" type="epp:msgType"/> </sequence> </complexType> <complexType name="msgQType"> <sequence> <element name="qDate" type="dateTime" minOccurs="0"/> <element name="msg" type="epp:mixedMsgType" minOccurs="0"/> </sequence> <attribute name="count" type="unsignedLong" use="required"/> <attribute name="id" type="eppcom:minTokenType" use="required"/> </complexType> <complexType name="mixedMsgType" mixed="true"> <sequence> <any processContents="skip" minOccurs="0" maxOccurs="unbounded"/> </sequence> <attribute name="lang" type="language" default="en"/> </complexType> <!-- Human-readable text may be expressed in languages other than English. --> <complexType name="msgType"> <simpleContent> <extension base="normalizedString"> <attribute name="lang" type="language" default="en"/> </extension> </simpleContent> </complexType> <!-- EPP result codes. --> <simpleType name="resultCodeType"> <restriction base="unsignedShort"> <enumeration value="1000"/> <enumeration value="1001"/> <enumeration value="1300"/> <enumeration value="1301"/> <enumeration value="1500"/> <enumeration value="2000"/> <enumeration value="2001"/> <enumeration value="2002"/> <enumeration value="2003"/> <enumeration value="2004"/> <enumeration value="2005"/> <enumeration value="2100"/> <enumeration value="2101"/> <enumeration value="2102"/> <enumeration value="2103"/> <enumeration value="2104"/> <enumeration value="2105"/> <enumeration value="2106"/> <enumeration value="2200"/> <enumeration value="2201"/> <enumeration value="2202"/> <enumeration value="2300"/> <enumeration value="2301"/> <enumeration value="2302"/> <enumeration value="2303"/> <enumeration value="2304"/> <enumeration value="2305"/> <enumeration value="2306"/> <enumeration value="2307"/> <enumeration value="2308"/> <enumeration value="2400"/> <enumeration value="2500"/> <enumeration value="2501"/> <enumeration value="2502"/> </restriction> </simpleType> <!-- End of schema. --> </schema> END 4.2. Shared Structure Schema BEGIN <?xml version="1.0" encoding="UTF-8"?> <schema targetNamespace="urn:ietf:params:xml:ns:eppcom-1.0" xmlns:eppcom="urn:ietf:params:xml:ns:eppcom-1.0" xmlns="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified"> <annotation> <documentation> Extensible Provisioning Protocol v1.0 shared structures schema. </documentation> </annotation> <!-- Object authorization information types. --> <complexType name="pwAuthInfoType"> <simpleContent> <extension base="normalizedString"> <attribute name="roid" type="eppcom:roidType"/> </extension> </simpleContent> </complexType> <complexType name="extAuthInfoType"> <sequence> <any namespace="##other"/> </sequence> </complexType> <!-- <check> response types. --> <complexType name="reasonType"> <simpleContent> <extension base="eppcom:reasonBaseType"> <attribute name="lang" type="language"/> </extension> </simpleContent> </complexType> <simpleType name="reasonBaseType"> <restriction base="token"> <minLength value="1"/> <maxLength value="32"/> </restriction> </simpleType> <!-- Abstract client and object identifier type. --> <simpleType name="clIDType"> <restriction base="token"> <minLength value="3"/> <maxLength value="16"/> </restriction> </simpleType> <!-- DNS label type. --> <simpleType name="labelType"> <restriction base="token"> <minLength value="1"/> <maxLength value="255"/> </restriction> </simpleType> <!-- Non-empty token type. --> <simpleType name="minTokenType"> <restriction base="token"> <minLength value="1"/> </restriction> </simpleType> <!-- Repository Object IDentifier type. --> <simpleType name="roidType"> <restriction base="token"> <pattern value="(\w|_){1,80}-\w{1,8}"/> </restriction> </simpleType> <!-- Transfer status identifiers. --> <simpleType name="trStatusType"> <restriction base="token"> <enumeration value="clientApproved"/> <enumeration value="clientCancelled"/> <enumeration value="clientRejected"/> <enumeration value="pending"/> <enumeration value="serverApproved"/> <enumeration value="serverCancelled"/> </restriction> </simpleType> <!-- 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. 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. EPP includes a provision for returning a human-readable message with every result code. This document describes result codes in English, but the actual text returned with a result MAY be provided in a language negotiated when a session is established. Languages other than English MUST be noted through specification of a "lang" attribute for each message. Valid values for the "lang" attribute and "lang" negotiation elements are described in [RFC3066]. 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 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. 6. IANA Considerations This document uses URNs to describe XML namespaces and XML schemas conforming to a registry mechanism described in [RFC3688]. Four URI assignments have been registered by the IANA. Registration request for the EPP namespace: URI: urn:ietf:params:xml:ns:epp-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 EPP XML schema: URI: urn:ietf:params:xml:schema:epp-1.0 Registrant Contact: See the "Author's Address" section of this document. XML: See the "Base Schema" section of this document. Registration request for the EPP shared structure namespace: URI: urn:ietf:params:xml:ns:eppcom-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 EPP shared structure XML schema: URI: urn:ietf:params:xml:schema:eppcom-1.0 Registrant Contact: See the "Author's Address" section of this document. XML: See the "Shared Structure Schema" section of this document. 7. Security Considerations EPP provides only simple client authentication services. A passive attack is sufficient to recover client identifiers and passwords, allowing trivial command forgery. Protection against most common attacks and more robust security services MUST be provided by other protocol layers. Specifically, EPP instances MUST be protected using a transport mechanism or application protocol that provides integrity and confidentiality. EPP uses a variant of the PLAIN SASL mechanism described in [RFC2595] to provide a simple application-layer authentication service that augments or supplements authentication and identification services that might be available at other protocol layers. Where the PLAIN SASL mechanism specifies provision of an authorization identifier, authentication identifier, and password as a single string separated by ASCII NUL characters, EPP specifies use of a combined authorization and authentication identifier and a password provided as distinct XML elements. Repeated password guessing attempts can be discouraged by limiting the number of <login> attempts that can be attempted on an open connection. A server MAY close an open connection if multiple <login> attempts are made with either an invalid client identifier, an invalid password, or both an invalid client identifier and an invalid password. EPP uses authentication information associated with objects to confirm object transfer authority. Authentication information exchanged between EPP clients and third party entities MUST be exchanged using a facility that provides privacy and integrity services to protect against unintended disclosure and modification while in transit. 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 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, Eric Brunner-Williams, Jordyn Buchanan, Roger Castillo Cortazar, Dave Crocker, Ayesha Damaraju, Sheer El- Showk, Patrik Faltstrom, James Gould, John Immordino, Dan Kohn, Hong Liu, Klaus Malorny, Dan Manley, Michael Mealling, Patrick Mevzek, Andrew Newton, Budi Rahardjo, Asbjorn Steira, Rick Wesson, and Jay Westerdal. 9. References 9.1. Normative References [RFC2119] Bradner, S., "Key Words for Use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC2277] Alvestrand, H., "IETF Policy on Character Sets and Languages", BCP 18, RFC 2277, January 1998. [RFC2279] Yergeau, F., "UTF-8, a transformation format of ISO 10646", RFC 2279, January 1998. [RFC2781] Hoffman, P. and F. Yergeau, "UTF-16, an encoding of ISO 10646", RFC 2781, February 2000. [RFC2914] Floyd, S., "Congestion Control Principles", BCP 41, RFC 2914, September 2000. [RFC3023] Murata, M., St.Laurent, S. and D. Kohn, "XML Media Types", RFC 3023, January 2001. [RFC3066] Alvestrand, H., "Tags for the Identification of Languages", BCP 47, RFC 3066, January 2001. [RFC3339] Klyne, G. and C. Newman, "Date and Time on the Internet: Timestamps", RFC 3339, July 2002. [RFC3375] Hollenbeck, S., "Generic Registry-Registrar Protocol Requirements", RFC 3375, September 2002. [RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688, January 2004. [XML] Editor T. Bray et al.: "Extensible Markup Language (XML) 1.0 (Second Edition)", W3C Recommendation 6 October 2000. [XMLE] "XML 1.0 Second Edition Specification Errata", E22, 25 July 2001, http://www.w3.org/XML/xml-V10-2e-errata#E22. [XMLS-1] Editors H. Thompson et al.: "XML Schema Part 1: Structures", W3C Recommendation 2 May 2001. [XMLS-2] Editors P. Biron, A. Malhotra: "XML Schema Part 2: Datatypes", W3C Recommendation 2 May 2001. 9.2. Informative References [P3P] Editor M. Marchiori: "The Platform for Privacy Preferences 1.0 (P3P1.0) Specification", W3C Recommendation 16 April 2002. [RFC793] Postel, J., "Transmission Control Protocol", STD 7, RFC 793, September 1981. [RFC2595] Newman, C., "Using TLS with IMAP, POP3 and ACAP", RFC 2595, June 1999. [RFC2821] Klensin, J., Ed., "Simple Mail Transfer Protocol", RFC 2821, April 2001. [RFC2960] Stewart, R., Xie, Q., Morneault, K., Sharp, C., Schwarzbauer, H., Taylor, T., Rytina, I., Kalla, M., Zhang, L. and V. Paxson, "Stream Control Transmission Protocol", RFC 2960, October 2000. [RFC3080] Rose, M., "The Blocks Extensible Exchange Protocol Core", RFC 3080, March 2001. Appendix A: Object Mapping Template This appendix describes a recommended outline for documenting the EPP mapping of an object. Documents that describe EPP object mappings SHOULD describe the mapping in a format similar to the one used here. Additional sections are required if the object mapping is written in Internet-Draft or RFC format. 1. Introduction Provide an introduction that describes the object and an overview of the mapping to EPP. 2. Object Attributes Describe the attributes associated with the object, including references to syntax specifications as appropriate. Examples of object attributes include a name or identifier and dates associated with modification events. 3. EPP Command Mapping 3.1. EPP Query Commands 3.1.1. EPP <check> Command Describe the object-specific mappings required to implement the EPP <check> command. Include both sample commands and sample responses. 3.1.2. EPP <info> Command Describe the object-specific mappings required to implement the EPP <info> command. Include both sample commands and sample responses. 3.1.3. EPP <poll> Command Describe the object-specific mappings required to implement the EPP <poll> command. Include both sample commands and sample responses. 3.1.4. EPP <transfer> Command Describe the object-specific mappings required to implement the EPP <transfer> query command. Include both sample commands and sample responses. 3.2. EPP Transform Commands 3.2.1. EPP <create> Command Describe the object-specific mappings required to implement the EPP <create> command. Include both sample commands and sample responses. Describe the status of the object with respect to time, including expected client and server behavior if a validity period is used. 3.2.2. EPP <delete> Command Describe the object-specific mappings required to implement the EPP <delete> command. Include both sample commands and sample responses. 3.2.3. EPP <renew> Command Describe the object-specific mappings required to implement the EPP <renew> command. Include both sample commands and sample responses. 3.2.4. EPP <transfer> Command Describe the object-specific mappings required to implement the EPP <transfer> command. Include both sample commands and sample responses. 3.2.5. EPP <update> Command Describe the object-specific mappings required to implement the EPP <update> command. Include both sample commands and sample responses. 4. Formal Syntax Provide the XML schema for the object mapping. An XML DTD MUST NOT be used as DTDs do not provide sufficient support for XML namespaces and strong data typing. Appendix B: Media Type Registration: application/epp+xml MIME media type name: application MIME subtype name: epp+xml Mandatory parameters: none Optional parameters: Same as the charset parameter of application/xml as specified in [RFC3023]. Encoding considerations: Same as the encoding considerations of application/xml as specified in [RFC3023]. Security considerations: This type has all of the security considerations described in [RFC3023] plus the considerations specified in the Security Considerations section of this document. Interoperability considerations: XML has proven to be interoperable across WebDAV clients and servers, and for import and export from multiple XML authoring tools. For maximum interoperability, validating processors are recommended. Although non-validating processors can be more efficient, they are not required to handle all features of XML. For further information, see sub-section 2.9 "Standalone Document Declaration" and section 5 "Conformance" of [XML]. Published specification: This document. Applications which use this media type: EPP is device-, platform-, and vendor-neutral and is supported by multiple service providers. Additional information: If used, magic numbers, fragment identifiers, base URIs, and use of the BOM should be as specified in [RFC3023]. Magic number(s): None. File extension(s): .xml Macintosh File Type Code(s): "TEXT" Person and email address for further information: See the "Author's Address" section of this document. Intended usage: COMMON Author/Change controller: IETF Author's Address Scott Hollenbeck VeriSign Global Registry Services 21345 Ridgetop Circle Dulles, VA 20166-6503 USA EMail: shollenbeck@verisign.com 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 on the procedures with respect to rights in RFC documents can be found in BCP 78 and BCP 79. Copies of IPR disclosures made to the IETF Secretariat and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementers or users of this specification can be obtained from the IETF on-line IPR repository at http://www.ietf.org/ipr. The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights that may cover technology that may be required to implement this standard. Please address the information to the IETF at ietf- ipr@ietf.org. Acknowledgement Funding for the RFC Editor function is currently provided by the Internet Society.