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.
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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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