ISO 20022-3:2013

Overview

ISO 20022-3:2013 - "Financial services - Universal financial industry message scheme - Part 3: Modelling" defines a structured, methodical modelling workflow for creating and maintaining ISO 20022 message models. It complements ISO 20022-1 (metamodel) and ISO 20022-2 (UML profile) and focuses on the activities modellers follow to develop standardized BusinessTransactions and MessageSets. The standard uses a four-level modelling approach (Scope, Conceptual, Logical, Physical), is technology‑independent, and provides guidelines, constraints and naming conventions. Examples in the document are illustrative only and are not normative. Registration procedures and permissible artefacts are handled separately in ISO 20022-7.

Key Topics

• Modelling workflow and activities: stepwise guidance across Scope, Conceptual, Logical and Physical levels (e.g., define business context, business model, BusinessTransactions, MessageSets, compose MessageDefinitions, create syntax schemes).
• Levels of abstraction: clear separation of business scope, conceptual models, logical message definitions, and physical syntax implementations to ensure consistency and scalability.
• UML and MOF grounding: alignment with ISO 20022-1 (MOF metamodel) and ISO 20022-2 (UML profile) for model representation.
• Repository concepts: use of a central Repository maintained by the Registration Authority with a DataDictionary (reusable model elements) and a BusinessProcessCatalogue (message definitions, processes and syntax implementations).
• Constraints, naming and conventions: rules and guidelines to ensure interoperable, predictable message structures (including constraints, inheritance, normalization and naming conventions).
• Non-normative examples and Annexes: applied UML diagrams and practical modelling illustrations are provided to clarify methodology without being normative.

Applications

ISO 20022-3 is designed for anyone responsible for modelling financial messaging and ensuring interoperability across systems:

• Message architects and modellers designing standardized BusinessTransactions and MessageSets.
• Banks, clearing houses, payment schemes and market infrastructures defining industry message exchanges.
• Fintech vendors and system integrators implementing ISO 20022 payloads and transformations.
• Standards and governance teams responsible for repository submissions and lifecycle management of message artefacts.

Practical outcomes include consistent message design, a repeatable modelling process, easier transformation to physical syntaxes (XML, ASN.1 via other ISO 20022 parts), and clearer registration-ready artefacts for repository management.

Related Standards

• ISO 20022-1 - Metamodel (MOF)
• ISO 20022-2 - UML profile
• ISO 20022-4 - XML Schema generation rules
• ISO 20022-5 - Reverse engineering / logical model alignment
• ISO 20022-6 - Message transport characteristics
• ISO 20022-7 - Registration processes (permissible artefacts)
• ISO 20022-8 - ASN.1 generation

Using ISO 20022-3 in conjunction with these parts ensures a robust, end‑to‑end approach to designing, registering and implementing standardized financial industry messages.