Financial services — Semantic technology — Part 5: Mapping from FIX Orchestra to the common model

This document reports on a study to map messages defined using FIX Orchestra into the ISO 20022 model.

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ISO/TR 22126-5:2022 - Financial services — Semantic technology — Part 5: Mapping from FIX Orchestra to the common model Released:26. 08. 2022
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REPORT 22126-5
First edition
Financial services — Semantic
technology —
Part 5:
Mapping from FIX Orchestra to the
common model
Reference number
ISO/TR 22126-5:2022(E)
© ISO 2022

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ISO/TR 22126-5:2022(E)
© ISO 2022
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
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CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Published in Switzerland
  © ISO 2022 – All rights reserved

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ISO/TR 22126-5:2022(E)
Contents Page
Foreword .iv
Introduction .v
1 S c op e . 1
2 Nor m at i ve r ef er enc e s . 1
3 Terms and definitions . 1
4 M apping FIX Orchestra . 2
4 .1 F I X O r c he s t r a . 2
4.1.1 General . 2
4.1.2 Relationship to FIX . 2
4.2 I SO 20022 model . 2
4 . 3 M appi n g appr o ac h . 3
4.3.1 G eneral . 3
4.3.2 E core model creation . 3
4 .4 Mo del t r a n s f or m at ion . 3
4 . 5 I nc omple t e m appi n g s. 4
4 . 6 F i nd i ng s . 4
4.6.1 General . 4
4 . 6 . 2 B eh av iou r a l mo del . 4
4.6.3 Datatypes . 5
4 . 6 .4 C ons t r a i nt s . 5
Bibliography . 6
© ISO 2022 – All rights reserved

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ISO/TR 22126-5:2022(E)
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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see
Any trade name used in this document is information given for the convenience of users and does not
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For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
This document was prepared by Technical Committee ISO/TC 68, Financial services, Subcommittee SC 9,
Information exchange for financial services.
A list of all parts in the ISO 22126 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at
  © ISO 2022 – All rights reserved

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ISO/TR 22126-5:2022(E)
FIX Orchestra is a standard issued by FIX Trading Community to exchange message structures,
workflow choreographies and application behaviours between trading counterparties. FIX Orchestra is
currently Version 1.0 Draft Standard and is published as a specification with an XML Schema.
A study was conducted to map FIX message definitions, as encoded in the FIX Orchestra schema, to
semantic terms consistent with the ISO 20022 metamodel. The objective was to map multiple financial
protocols, including FIX, to ISO 20022, a common model, so that they can be compared, and for
commonalities to be identified. Any deficiencies of the model discovered will be rectified so that its
capacity to support other financial industry protocols can be improved in future versions.
© ISO 2022 – All rights reserved

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Financial services — Semantic technology —
Part 5:
Mapping from FIX Orchestra to the common model
1 S cope
This document reports on a study to map messages defined using FIX Orchestra into the ISO 20022
2 Normat ive references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
peer in a messaging system
code set
datatype that constrains message values to one member of a finite set
predefined part of a message that may be reused in many message types
context-free data domain
smallest unit of business semantics
property that specifies whether the member is required
repeating group
group component with many-to-one cardinality
© ISO 2022 – All rights reserved

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ISO/TR 22126-5:2022(E)
exchange of message types between actors
4 Mapping FIX Or chestra
4.1 FIX Orchestra
4.1.1 General
FIX Orchestra was designed to provide a distributable model of message definitions as well as workflow.
Its motto is “machine readable rules of engagement”. FIX Trading Community uses Orchestra to publish
the FIX standard. Firms may use it to publish their rules of engagement, typically a modified subset of
the FIX standard. The final rules of engagement are determined by agreement between counterparties.
Orchestra is serialized as XML, and is controlled by XML schemas, but consideration has been given to
using RDF/OWL in the future.
Orchestra has two XML schemas: repository and interfaces. The repository schema defines message
structures and workflow. FIX Orchestra incorporates a message model, but unlike ISO 20022 the
message definitions are not traced to a formal business model or metamodel.
Elements of an Orchestra repository file include the following:
— Message definitions, including their reusable parts: components, repeating groups and fields. In FIX,
message types are often overloaded for multiple use cases, so message scenarios refine me

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