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Versions: 00 01 02 03 04 05 06 07 08 09 RFC 3730

Internet Engineering Task Force                            S. Hollenbeck
Internet-Draft                                            VeriSign, Inc.
March 11, 2003                               Expires: September 11, 2003

                    Extensible Provisioning Protocol
                    <draft-ietf-provreg-epp-09.txt>

Status of this Memo

  This document is an Internet-Draft and is in full conformance with all
  provisions of Section 10 of RFC2026.

  Internet-Drafts are working documents of the Internet Engineering Task
  Force (IETF), its areas, and its working groups.  Note that other
  groups may also distribute working documents as Internet-Drafts.

  Internet-Drafts are draft documents valid for a maximum of six months
  and may be updated, replaced, or obsoleted by other documents at any
  time.  It is inappropriate to use Internet-Drafts as reference
  material or to cite them other than as "work in progress".

  The list of current Internet-Drafts can be accessed at
  http://www.ietf.org/ietf/1id-abstracts.txt

  The list of Internet-Draft Shadow Directories can be accessed at
  http://www.ietf.org/shadow.html.

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.

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.




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Table of Contents

  1. Introduction .................................................    3
  2. Protocol Description .........................................    4
  2.1 Transport Mapping Considerations ............................    7
  2.2 Protocol Identification .....................................    8
  2.3 Hello Format ................................................    8
  2.4 Greeting Format .............................................    8
  2.5 Command Format ..............................................   12
  2.6 Response Format .............................................   13
  2.7 Protocol Extension Framework ................................   18
  2.7.1 Protocol Extension ........................................   18
  2.7.2 Object Extension ..........................................   19
  2.7.3 Command-Response Extension ................................   20
  2.8 Object Identification .......................................   21
  2.9 Protocol Commands ...........................................   21
  2.9.1 Session Management Commands ...............................   21
  2.9.1.1 EPP <login> Command .....................................   22
  2.9.1.2 EPP <logout> Command ....................................   24
  2.9.2 Query Commands ............................................   25
  2.9.2.1 EPP <check> Command .....................................   26
  2.9.2.2 EPP <info> Command ......................................   28
  2.9.2.3 EPP <poll> Command ......................................   29
  2.9.2.4 EPP <transfer> Query Command ............................   34
  2.9.3 Object Transform Commands .................................   35
  2.9.3.1 EPP <create> Command ....................................   36
  2.9.3.2 EPP <delete> Command ....................................   37
  2.9.3.3 EPP <renew> Command .....................................   38
  2.9.3.4 EPP <transfer> Command ..................................   40
  2.9.3.5 EPP <update> Command ....................................   43
  3. Result Codes .................................................   46
  4. Formal Syntax ................................................   52
  4.1 Base Schema .................................................   52
  4.2 Shared Structure Schema .....................................   62
  5. Internationalization Considerations ..........................   65
  6. IANA Considerations ..........................................   66
  7. Security Considerations ......................................   67
  8. Acknowledgements .............................................   68
  9. References ...................................................   69
  10. Author's Address ............................................   70
  A. Full Copyright Statement .....................................   71
  B: Object Mapping Template ......................................   72
  C: Media Type Registration: application/epp+xml .................   74
  D. Revisions From Previous Version ..............................   75







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1. Introduction

  This document describes specifications for the Extensible Provisioning
  Protocol (EPP) version 1.0, an XML text protocol that permits multiple
  service providers to perform object provisioning operations using a
  shared central object repository.  EPP is specified using the
  Extensible Markup Language (XML) 1.0 as described in [XML] and XML
  Schema notation as described in [XMLS-1] and [XMLS-2].  EPP meets and
  exceeds the requirements for a generic registry registrar protocol as
  described in [RFC3375].

  EPP content is identified by MIME media type application/epp+xml.
  Registration information for this media type is included in an
  appendix to this document.

  EPP is intended for use in diverse operating environments where
  transport and security requirements vary greatly.  It is unlikely that
  a single transport or security specification will meet the needs of all
  anticipated operators, so EPP was designed for use in a layered
  protocol environment.  Bindings to specific transport and security
  protocols are outside the scope of this specification.

  This original motivation for this protocol was to provide a standard
  Internet domain name registration protocol for use between domain name
  registrars and domain name registries.  This protocol provides a means
  of interaction between a registrar's applications and registry
  applications.  It is expected that this protocol will have additional
  uses beyond domain name registration.

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



















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2. Protocol Description

  EPP is a stateful XML protocol that can be layered over multiple
  transport protocols.  Protected using lower-layer security protocols,
  clients exchange identification, authentication, and option
  information, and then engage in a series of client-initiated
  command-response exchanges.  All EPP commands are atomic (there is no
  partial success or partial failure) and designed so that they can
  be made idempotent (executing a command more than once has the same
  net effect on system state as successfully executing the command once).

  EPP provides four basic service elements: service discovery, commands,
  responses, and an extension framework that supports definition of
  managed objects and the relationship of protocol requests and
  responses to those objects.

  An EPP server MUST respond to client-initiated communication (which
  can be either a lower-layer connection request or an EPP service
  discovery message) by returning a greeting to a client.  A server MUST
  promptly respond to each EPP command with a coordinated response that
  describes the results of processing the command.  The following server
  state machine diagram illustrates the message exchange process in
  detail:




























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                 |
                 V
        +-----------------+                  +-----------------+
        |   Waiting for   |     Connected    |     Prepare     |
        |      Client     |----------------->|     Greeting    |
        +-----------------+    or <hello>    +-----------------+
           ^                                           |
           | Close Connection                     Send |
           |     or Idle                      Greeting |
        +-----------------+                            V
        |       End       |     Timeout      +-----------------+
        |     Session     |<-----------------|   Waiting for   |
        +-----------------+                  |      Client     |
           ^    ^    ^        Send +-------->|  Authentication |
           |    |    |    Response |         +-----------------+
           |    |    |     +--------------+            |
           |    |    |     | Prepare Fail |            | <login>
           |    |    +-----|   Response   |            | Received
           |    |    Send  +--------------+            V
           |    |    2501          ^         +-----------------+
           |    |   Response       |         |   Processing    |
           |    |                  +---------|     <login>     |
           |    |                  Auth Fail +-----------------+
           |    |                                       |
           |    |                                       | Auth OK
           |    |                                       V
           |    |              Timeout       +-----------------+
           |    +----------------------------|   Waiting for   |
           |                                 |     Command     |
           | Send x5xx                       +-----------------+
           | Response  +-----------------+  Send    ^  |
           +-----------|     Prepare     | Response |  | Command
                       |     Response    |----------+  | Received
                       +-----------------+             V
                                  ^          +-----------------+
                          Command |          |   Processing    |
                        Processed +----------|     Command     |
                                             +-----------------+

                    Figure 1: EPP Server State Machine

  EPP commands fall into three categories: session management commands,
  query commands, and data transform commands.  Session management
  commands are used to establish and end persistent sessions with an EPP
  server.  Query commands are used to perform read-only object
  information retrieval operations.  Transform commands are used to
  perform read-write object management operations.



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  Commands are processed by a server in the order they are received from
  a client.  Though an immediate response confirming receipt and
  processing of the command is produced by the server, the protocol
  includes features that allow for offline review of transform commands
  before the requested action is actually completed.  In such situations
  the response from the server MUST clearly note that the command has
  been received and processed, but the requested action is pending.  The
  state of the corresponding object MUST clearly reflect processing of
  the pending action.  The server MUST also notify the client when
  offline processing of the action has been completed.  Object mappings
  SHOULD describe standard formats for notices that describe completion
  of offline processing.

  EPP uses XML namespaces to provide an extensible object management
  framework and to identify schemas required for XML instance parsing
  and validation.  These namespaces and schema definitions are used to
  identify both the base protocol schema and the schemas for managed
  objects.

  All XML instances SHOULD begin with an <?xml?> declaration to identify
  the version of XML that is being used, optionally identify use of the
  character encoding used, and optionally provide a hint to an XML
  parser that an external schema file is needed to validate the XML
  instance.  Conformant XML parsers recognize both UTF-8 (defined in RFC
  2279 [RFC2279]) and UTF-16 (defined in RFC 2781 [RFC2781]); per RFC
  2277 [RFC2277] UTF-8 is the RECOMMENDED character encoding for use
  with EPP.

  Character encodings other than UTF-8 and UTF-16 are allowed by XML.
  UTF-8 is the default encoding assumed by XML in the absence of an
  "encoding" attribute or a byte order mark (BOM), thus the "encoding"
  attribute in the XML declaration is OPTIONAL if UTF-8 encoding is
  used.

  Normative section 4.3.3 and non-normative appendix F of [XML] describe
  use of a BOM to identify the character encoding in the absence of an
  XML declaration or encapsulating headers.  Appendix F includes a BOM
  to represent UTF-8 encoding, though section 4.3.3 notes that a BOM is
  not needed to identify UTF-8 encoding.  Section 4.3.3 was later
  amended (see [XMLE]) to clarify that a BOM MAY be used to identify
  UTF-8 encoding.  EPP clients and servers MUST accept a UTF-8 BOM if
  present, though emitting a UTF-8 BOM is NOT RECOMMENDED.









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  Example XML declarations:

  <?xml version="1.0" encoding="UTF-8" standalone="no"?>

  <?xml version="1.0" standalone="no"?>

  <?xml version="1.0" encoding="UTF-8"?>

  <?xml version="1.0"?>

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.



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  - 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



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  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.




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        <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.




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          <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.

















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  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



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  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.




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    - 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



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  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>























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  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>



























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  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>


















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  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:












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  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



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  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.



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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.




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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



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  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.











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  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.













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  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.



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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



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  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



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  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.












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  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



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  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.







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  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.












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  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 number of messages
  remaining in the queue and the ID of the next message available for
  retrieval.

  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="12346"/>
  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.













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  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



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  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,



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  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



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  <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.








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  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.











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  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



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  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.

















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  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.




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  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.














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  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.





















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  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="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 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:




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  - 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



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  an existing object.  This action SHOULD be limited to authorized
  clients; restricting this action to the sponsoring client is
  RECOMMENDED.
















































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3. Result Codes

  EPP result codes are based on the theory of reply codes described in
  section 4.2.1 of [RFC2821].  EPP uses four decimal digits to describe
  the success or failure of each EPP command.  Each of the digits of the
  reply have special significance.

  The first digit denotes command success or failure.  The second digit
  denotes the response category, such as command syntax or security.
  The third and fourth digits provide explicit response detail within
  each response category.

  There are two values for the first digit of the reply code:

  1yzz   Positive completion reply.  The command has been accepted and
  processed by the system without error.

  2yzz   Negative completion reply.  The command was not accepted and
  the requested action did not occur.

  The second digit groups responses into one of six specific categories:

  x0zz   Protocol Syntax
  x1zz   Implementation-specific Rules
  x2zz   Security
  x3zz   Data Management
  x4zz   Server System
  x5zz   Connection Management

  The third and fourth digits provide response detail within the
  categories defined by the first and second digits.  Specific result
  codes are listed in the table below.

  Every EPP response MUST include a result code and a human-readable
  description of the result code.  The language used to represent the
  description MAY be identified using an instance of the "lang"
  attribute within the <msg> element.  If not specified, the default
  language is English, identified as "en".  A description of the
  structure of valid values for the "lang" attribute is described in
  [RFC3066].

  Response text MAY be translated into other languages, though the
  translation MUST preserve the meaning of the code as described here.
  Response code values MUST NOT be changed when translating text.

  Response text in the table below is enclosed in quotes to clearly mark
  the beginning and ending of each response string.  Quotes MUST NOT be
  used to delimit these strings when returning response text via the



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  protocol.

  Successful command completion responses:

  Code    Response text in English
  ___________________________________

  1000    "Command completed successfully"
  This is the usual response code for a successfully completed
  command that is not addressed by any other 1xxx-series response
  code.

  1001    "Command completed successfully; action pending"
  This response code MUST be returned when responding to a command
  the requires offline activity before the requested action can be
  completed.  See section 2 for a description of other processing
  requirements.

  1300    "Command completed successfully; no messages"
  This response code MUST be returned when responding to a <poll>
  request command and the server message queue is empty.

  1301    "Command completed successfully; ack to dequeue"
  This response code MUST be returned when responding to a <poll>
  request command and a message has been retrieved from the server
  message queue.

  1500    "Command completed successfully; ending session"
  This response code MUST be returned when responding to a successful
  <logout> command.

  Command error responses:

  Code    Response text in English
  ___________________________________

  2000    "Unknown command"
  This response code MUST be returned when a server receives a command
  element that is not defined by EPP.

  2001    "Command syntax error"
  This response code MUST be returned when a server receives an
  improperly formed command element.

  2002    "Command use error"
  This response code MUST be returned when a server receives a properly
  formed command element, but the command can not be executed due to a
  sequencing or context error.  For example, a <logout> command can not



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  be executed without having first completed a <login> command.

  2003    "Required parameter missing"
  This response code MUST be returned when a server receives a command
  for which a required parameter value has not been provided.

  2004    "Parameter value range error"
  This response code MUST be returned when a server receives a command
  parameter whose value is outside the range of values specified
  by the protocol.  The error value SHOULD be returned via a <value>
  element in the EPP response.

  2005    "Parameter value syntax error"
  This response code MUST be returned when a server receives a command
  containing a parameter whose value is improperly formed.  The error
  value SHOULD be returned via a <value> element in the EPP response.

  2100    "Unimplemented protocol version"
  This response code MUST be returned when a server receives a command
  element specifying a protocol version that is not implemented by the
  server.

  2101    "Unimplemented command"
  This response code MUST be returned when a server receives a valid
  EPP command element that is not implemented by the server.  For
  example, a <transfer> command can be unimplemented for certain object
  types.

  2102    "Unimplemented option"
  This response code MUST be returned when a server receives a valid
  EPP command element that contains a protocol option that is not
  implemented by the server.

  2103    "Unimplemented extension"
  This response code MUST be returned when a server receives a valid
  EPP command element that contains a protocol command extension that
  is not implemented by the server.

  2104    "Billing failure"
  This response code MUST be returned when a server attempts to execute
  a billable operation and the command can not be completed due to a
  client billing failure.

  2105    "Object is not eligible for renewal"
  This response code MUST be returned when a client attempts to <renew>
  an object that is not eligible for renewal in accordance with server
  policy.




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  2106    "Object is not eligible for transfer"
  This response code MUST be returned when a client attempts to
  <transfer> an object that is not eligible for transfer in accordance
  with server policy.

  2200    "Authentication error"
  This response code MUST be returned when a server notes an error when
  validating client credentials.

  2201    "Authorization error"
  This response code MUST be returned when a server notes a client
  authorization error when executing a command.  This error is used to
  note that a client lacks privileges to execute the requested command.

  2202    "Invalid authorization information"
  This response code MUST be returned when a server receives invalid
  command authorization information required to confirm authorization to
  execute a command.  This error is used to note that a client has the
  privileges required to execute the requested command, but the
  authorization information provided by the client does not match the
  authorization information archived by the server.

  2300    "Object pending transfer"
  This response code MUST be returned when a server receives a command
  to transfer an object that is pending transfer due to an earlier
  transfer request.

  2301    "Object not pending transfer"
  This response code MUST be returned when a server receives a command
  to confirm, reject, or cancel the transfer an object when no command
  has been made to transfer the object.

  2302    "Object exists"
  This response code MUST be returned when a server receives a command
  to create an object that already exists in the repository.

  2303    "Object does not exist"
  This response code MUST be returned when a server receives a command
  to query or transform an object that does not exist in the repository.

  2304    "Object status prohibits operation"
  This response code MUST be returned when a server receives a command
  to transform an object that can not be completed due to server policy
  or business practices.  For example, a server can disallow <transfer>
  commands under terms and conditions that are matters of local policy,
  or the server might have received a <delete> command for an object
  whose status prohibits deletion.




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  2305    "Object association prohibits operation"
  This response code MUST be returned when a server receives a command
  to transform an object that can not be completed due to dependencies
  on other objects that are associated with the target object.  For
  example, a server can disallow <delete> commands while an object has
  active associations with other objects.

  2306    "Parameter value policy error"
  This response code MUST be returned when a server receives a command
  containing a parameter value that is syntactically valid, but
  semantically invalid due to local policy.  For example, the server
  can support a subset of a range of valid protocol parameter values.
  The error value SHOULD be returned via a <value> element in the EPP
  response.

  2307    "Unimplemented object service"
  This response code MUST be returned when a server receives a command
  to operate on an object service that is not supported by the server.

  2308    "Data management policy violation"
  This response code MUST be returned when a server receives a command
  whose execution results in a violation of server data management
  policies.  For example, removing all attribute values or object
  associations from an object might be a violation of a server's data
  management policies.

  2400    "Command failed"
  This response code MUST be returned when a server is unable to
  execute a command due to an internal server error that is not related
  to the protocol.  The failure can be transient.  The server MUST keep
  any ongoing session active.

  2500    "Command failed; server closing connection"
  This response code MUST be returned when a server receives a command
  that can not be completed due to an internal server error that is not
  related to the protocol.  The failure is not transient, and will
  cause other commands to fail as well.  The server MUST end the
  active session and close the existing connection.

  2501    "Authentication error; server closing connection"
  This response code MUST be returned when a server notes an error when
  validating client credentials and a server-defined limit on the number
  of allowable failures has been exceeded.  The server MUST close the
  existing connection.

  2502    "Session limit exceeded; server closing connection"
  This response code MUST be returned when a server receives a <login>
  command, and the command can not be completed because the client has



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  exceeded a system-defined limit on the number of sessions that the
  client can establish.  It might be possible to establish a session by
  ending existing unused sessions and closing inactive connections.
















































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4. Formal Syntax

  EPP is specified in XML Schema notation.  The formal syntax presented
  here is a complete schema representation of EPP suitable for automated
  validation of EPP XML instances.

  Two schemas are presented here.  The first schema is the base EPP
  schema.  The second schema defines elements and structures that can be
  used by both the base EPP schema and object mapping schemas.  The
  BEGIN and END tags are not part of the schema; they are used to note
  the beginning and ending of the schema for URI registration purposes.

4.1 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"/>



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        <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.
  -->



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    <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"/>



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        <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>



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    </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>



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        <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>




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  <!--
  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>




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  <!--
  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"



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         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"/>



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        <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























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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"/>



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        <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"/>



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        <enumeration value="clientCancelled"/>
        <enumeration value="clientRejected"/>
        <enumeration value="pending"/>
        <enumeration value="serverApproved"/>
        <enumeration value="serverCancelled"/>
      </restriction>
    </simpleType>

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






































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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.


























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6. IANA Considerations

  This document uses URNs to describe XML namespaces and XML schemas
  conforming to a registry mechanism described in [IETF-XML].  Four URI
  assignments are requested.

  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.










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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.



















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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.



































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9. References

  Normative References:

  [IETF-XML] M. Mealling: "The IETF XML Registry", work in progress.

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

  [RFC2277] H. Alvestrand: "IETF Policy on Character Sets and
  Languages", BCP 18, RFC 2277, January 1998.

  [RFC2279] F. Yergeau: "UTF-8, a transformation format of ISO 10646",
  RFC 2279, January 1998.

  [RFC2781] P. Hoffman, F. Yergeau: "UTF-16, an encoding of ISO 10646",
  RFC 2781, February 2000.

  [RFC2914] S. Floyd: "Congestion Control Principles", BCP 41, RFC 2914,
  September 2000.

  [RFC3023] M. Murata et al.: "XML Media Types", RFC 3023, January 2001.

  [RFC3066] H. Alvestrand: "Tags for the Identification of Languages",
  BCP 47, RFC 3066, January 2001.

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

  [RFC3375] S. Hollenbeck: "Generic Registry-Registrar Protocol
  Requirements", RFC 3375, September 2002.

  [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.








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  Informative References:

  [P3P] Editor M. Marchiori: "The Platform for Privacy Preferences 1.0
  (P3P1.0) Specification", W3C Recommendation 16 April 2002.

  [RFC793] J. Postel: "Transmission Control Protocol", STD 7, RFC 793,
  September 1981.

  [RFC2595] C. Newman: "Using TLS with IMAP, POP3 and ACAP", RFC 2595,
  June 1999.

  [RFC2821] J. Klensin: "Simple Mail Transfer Protocol", RFC 2821, April
  2001.

  [RFC2960] R. Stewart et al.: "Stream Control Transmission Protocol",
  RFC 2960, October 2000.

  [RFC3080] M. Rose: "The Blocks Extensible Exchange Protocol Core", RFC
  3080, March 2001.

10. Author's Address

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























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A. Full Copyright Statement

  Copyright (C) The Internet Society 2002.  All Rights Reserved.

  This document and translations of it may be copied and furnished to
  others, and derivative works that comment on or otherwise explain it
  or assist in its implementation may be prepared, copied, published and
  distributed, in whole or in part, without restriction of any kind,
  provided that the above copyright notice and this paragraph are
  included on all such copies and derivative works.  However, this
  document itself may not be modified in any way, such as by removing
  the copyright notice or references to the Internet Society or other
  Internet organizations, except as needed for the purpose of developing
  Internet standards in which case the procedures for copyrights defined
  in the Internet Standards process must be followed, or as required to
  translate it into languages other than English.

  The limited permissions granted above are perpetual and will not be
  revoked by the Internet Society or its successors or assigns.

  This document and the information contained herein is provided on an
  "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
  TASK FORCE DISCLAIMS 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.

Acknowledgement

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




















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B: 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



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  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.




















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C: 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







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D. Revisions From Previous Version

  (Note to RFC editor: please remove this section completely before
  publication as an RFC.)

  -08 to -09 (IESG review):

  Made the <dcp> element mandatory in the schema (section 4.1) and
  modified the descriptive text in section 2.3.

  Reordered the appendices to put this section last so that the RFC
  Editor has a little less work to do when removing this section.







































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