ISO 20022-6:2009

INTERNATIONAL ISO
STANDARD 20022-6
First edition
2009-10-01

Financial services — UNIversal Financial
Industry message scheme —
Part 6:
Message Transport Characteristics
Services financiers — Schéma universel de messages pour l'industrie
financière —
Partie 6: Caractéristiques du transport de message




Reference number
ISO 20022-6:2009(E)
©
ISO 2009

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ISO 20022-6:2009(E)
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ISO 20022-6:2009(E)
Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Exchange of messages in ISO 20022. 3
4.1 Layered protocol. 3
4.2 Layering principles. 4
4.3 Receiving Messaging Endpoint Idempotent Behaviour . 5
4.4 Bandwidth Assumption. 5
4.5 Security Assumption. 5
5 Message Transport Characteristics. 5
5.1 General. 5
5.2 Delivery Assurance. 6
5.3 Sender Asynchronicity. 6
5.4 Receiver Asynchronicity. 6
5.5 Bounded Communication Delay . 7
5.6 Message Delivery Order. 7
5.7 Message Delivery Window. 8
5.8 Message Sending Window. 8
5.9 Message Casting. 8
5.10 Message Validation On/Off . 9
5.11 Message Validation Results . 9
5.12 Message Validation Level . 9
5.13 Durability . 10
5.14 Maximum Message Size. 10
6 Times and clocks. 11
6.1 Clocks . 11
6.2 Time representation. 11
7 Registering Message Transport Modes. 11
7.1 General. 11
7.2 Example 1: Reliable Mode. 11
7.3 Example 2: Quick Mode . 12
Bibliography . 13

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ISO 20022-6:2009(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 20022-6 was prepared by Technical Committee ISO/TC 68, Financial services.
ISO 20022 consists of the following parts, under the general title Financial services — UNIversal Financial
Industry message scheme:
⎯ Part 1: Overall methodology and format specifications for inputs to and outputs from the ISO 20022
Repository
⎯ Part 2: Roles and responsibilities of the registration bodies
⎯ Part 3: ISO 20022 modelling guidelines [Technical Specification]
⎯ Part 4: ISO 20022 XML design rules [Technical Specification]
⎯ Part 5: ISO 20022 reverse engineering [Technical Specification]
⎯ Part 6: Message Transport Characteristics

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INTERNATIONAL STANDARD ISO 20022-6:2009(E)

Financial services — UNIversal Financial Industry message
scheme —
Part 6:
Message Transport Characteristics
1 Scope
This part of ISO 20022 specifies the characteristics of the Message Transport System required for an
ISO 20022 Business Transaction and Message Definition. Changes to the value of the Message Transport
Characteristics can affect the Business Transaction and Message Definition.
Each Business Transaction in the ISO 20022 Repository is associated with a Message Transport Mode. The
Message Transport Mode specifies the values for the Message Transport Characteristics.
This part of ISO 20022 specifically does not define the wire-level interoperability of message transports. The
overall structure is of a layered specification, in order that ISO 20022 can be implemented over many
message transports. This part of ISO 20022 defines only those characteristics required for interoperability at
the business process and message level.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 20022-1, Financial services — UNIversal Financial Industry message scheme — Part 1: Overall
methodology and format specifications for inputs to and outputs from the ISO 20022 Repository
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 20022-1 and the following apply.
3.1
Address
element that identifies and efficiently resolves the location of a Messaging Endpoint (3.11)
NOTE The purpose of an Address is to efficiently resolve a location. This is what distinguishes an Address from any
other identifier, which merely identifies.
3.2
Broadcast List
set of references to Messaging Endpoints (3.11), identified by their Address (3.1), which is used for
Message Broadcasting
NOTE 1 The Broadcast List is managed by the Message Transport System (3.10), which provides a mechanism to
maintain the Broadcast List.
NOTE 2 “Set” means the list of Addresses is unordered and each Address is only present once.
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ISO 20022-6:2009(E)
3.3
Business Layer
higher or upper layer of the protocol hierarchy that is used to exchange ISO 20022 messages
NOTE Two layers are defined:
⎯ a Message Transport Layer (3.13), and
⎯ a Business Layer.
The Business Layer is concerned with the business process, independent of the mechanics of messaging
(i.e. independent of technology). The Message Transport Layer is concerned with the mechanics of messaging
(i.e. independent of the Business Process).
3.4
Business Message
document appearing in the Business Layer (3.3) that is an instance of an ISO 20022 Syntax Message
Scheme
NOTE A Business Message is valid against the related Message Definition in the ISO 20022 Repository. Validity
includes Syntax Message Scheme validity, as well as validity against the Message Rules, Rules and Market Practices that
are registered for this Message Definition.
3.5
Conversation
context, defined in the Message Choreography (3.7), in which messages are correlated
NOTE The concept is analogous to the concept of a Session in pi-calculus and similar process models.
3.6
Messaging Application Layer
layer immediately beneath the bottom layer of ISO 20022
NOTE This is the Open System Interconnection (OSI) Layer 7 application that delivers messages (see also 4.1).
EXAMPLE Examples of applications at the Messaging Application Layer: AMQP, ftp, http and SOAP, WebsphereMQ,
or SonicMQ.
3.7
Message Choreography
precise and complete description of a Business Message (3.4) exchange, describing the sequence and
correlation of messages within a Conversation (3.5), including the constraints on interaction
NOTE 1 Every Business Transaction contains its own Message Choreography.
NOTE 2 A Business Transaction describes all aspects of a particular solution that meets the requirements of a
Business Process. This includes, amongst other things, the Message Choreography, describing the structure of Business
Message exchange.
3.8
Message Transport Characteristics
properties of the Message Transport Layer (3.13) that are defined in this part of ISO 20022
3.9
Message Transport Mode
group of settings for the values for the Message Transport Characteristics (3.8) properties
NOTE 1 A Message Transport Mode is named and is registered in the ISO 20022 Repository. Each Message
Transport Characteristic is given a value.
NOTE 2 A Message Transport Mode can be associated with many Business Transactions. The Message Transport
Mode is used to organize commonly used combinations of Message Transport Characteristic settings.
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ISO 20022-6:2009(E)
3.10
Message Transport System
mechanism that receives Transport Messages (3.14) from the sending Messaging Endpoint (3.11),
transports them, and delivers them to the receiving Messaging Endpoint
NOTE 1 The Message Transport System is responsible for delivering Transport Messages to each Addressee.
NOTE 2 The purpose of the Message Transport System is to provide a clear delineation of the responsibility of the
Messaging Endpoints and any Message Transport System service providers. The role can be fulfilled by the sending
Messaging Endpoint or by a separate service provider who provides a Message Transport System. Message Transport
Systems can be chained together into a single Message Transport System.
3.11
Messaging Endpoint
addressable node on the Message Transport System (3.10) which is capable of sending and receiving
Transport Messages (3.14)
NOTE A Messaging Endpoint has an Address (3.1).
3.12
Name
identifier of something
NOTE 1 A Name is “pure”, i.e. it is used for no purpose other than to identify something.
NOTE 2 Business logic is not based on anything about a Name other than its identity.
3.13
Message Transport Layer
lower or bottom layer of the protocol that is used to exchange ISO 20022 messages
NOTE Two layers are defined:
⎯ a Message Transport Layer, and
⎯ a Business Layer (3.3).
The Business Layer is concerned with the business process, independent of the mechanics of messaging
(i.e. independent of technology). The Message Transport Layer is concerned with the mechanics of messaging
(i.e. independent of the Business Process).
3.14
Transport Message
document that is an instance of the Message Transport System (3.10) message schema
NOTE 1 The Transport Message appears in the Message Transport Layer (3.13). The Business Message (3.4) is
contained within the body of a Transport Message.
NOTE 2 ISO 20022 does not define the Message Transport System message schema because it is a layered
specification that supports multiple Message Transport Systems.
4 Exchange of messages in ISO 20022
4.1 Layered protocol
The protocol that is used for exchanging ISO 20022 messages is defined as being in two layers sitting directly
above the seven layers of the Open System Interconnection (OSI) model.
NOTE ISO/IEC 7498-1 is referred to as “OSI” throughout this part of ISO 20022.
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ISO 20022-6:2009(E)
⎯ The higher or upper layer is named the Business Layer and deals with Business Messages. The
exchange of Business Messages is fully described in the Message Choreography and the structure of the
Business Messages is fully described by the Message Definitions and related Message Rules, Rules and
Market Practices. All of these shall be registered in the ISO 20022 Repository. The Business Layer is
equivalent to adding a Layer 9 to the OSI model.
⎯ The lower or bottom layer is named the Message Transport Layer and deals with Transport Messages.
The implementation of the Message Transport Layer may vary and is therefore outside the scope of
ISO 20022. The behaviour and structure of the Transport Messages shall therefore not be registered in
the ISO 20022 Repository. The Transport Characteristics apply to the Message Transport Layer. The
Message Transport Layer is equivalent to adding a Layer 8 to the OSI model.
⎯ The layer immediately beneath and therefore outside the ISO 20022 Protocol is the Application Layer.
This is the Messaging Application layer. ISO 20022 allows any Messaging Application that will support the
requirements of the Message Transport Layer. The Messaging Application Layer is Layer 7 of the OSI
model.
4.2 Layering principles
A single new Business Message is created – by the sending business application – for each business event;
that is each interaction in a Business Transaction. A Business Message adheres to the following principles:
⎯ A Business Message shall not contain information about the Message Transport System or the
mechanics or mechanism of message sending, transportation, Address, or receipt.
⎯ A Business Message shall be comprehensible outside of the context of the Transport Message. That is
the Business Message shall not require knowledge of the Transport Message to be understood.
⎯ A Business Message may contain headers, footers and envelopes that are meaningful for the business.
When present, they are treated as any other message content, which means that they are considered
part of the Message Definition of the Business Message and as such will be part of the ISO 20022
Repository.
⎯ A Business Message refers to Business Actors by their Name. Each instance of a Business Actor has
one Name. The instance of the Business Actor shall not be referred to in the Message Transport Layer.
A new Transport Message is created for each time a Business Message is published by a sending Messaging
Endpoint. A Transport Message adheres to the following principles:
a) A Transport Message will have a body which only contains the Business Message.
b) A Transport Message may contain headers, footers and envelopes that are meaningful for the transport
and shall not contain information about
...