ISO 13209-4:2024

Overview

ISO 13209-4:2024 - "Road vehicles - Open Test sequence eXchange format (OTX) - Part 4: Expanded extensions interface definition" defines additional extension requirements and an exhaustive data-model specification for OTX. Building on the use cases in ISO 13209-1, this second-edition International Standard (2024-11) specifies syntax and semantics for OTX extension features using UML class diagrams and XML schemas (syntax) and UML activity diagrams plus prose (semantics). It establishes rules that ensure consistent interpretation of OTX documents that include extended functionality.

Key technical topics and requirements

The standard documents a comprehensive set of extension areas and their formal definitions. Major technical topics include:

• Extension requirements (Clause 4): A detailed listing of functional requirements derived from ISO 13209-1 use cases, covering assertion handling, communications, diagnostics, and more.
• Data model specification: Exhaustive definitions of extension features to enable interoperable implementations.
• Syntax and semantics: Syntax via UML class diagrams and XML schemas; semantics via UML activity diagrams and prose definitions to remove ambiguity in implementations.
• Defined extension domains: Includes (but is not limited to) Assertion, BlackBox, BusMonitoring, ComInterface, CommonDialogs, DataType, DiagComPlus, DiagConfiguration, ECUConfiguration, EcuStateChart, EventPlus, FlashPlus, Persistence, Range, SQL, StateMachineProcedure, TestResultHandling, VehicleInfo, XML, ZipHandling.
• Packaging rules: OTX packaging (PTX) and dependency management for exchangeable test assets.

Keywords naturally integrated: ISO 13209-4, OTX extensions, XML schema, UML class diagrams, test sequence exchange, PTX packaging, vehicle testing data model.

Practical applications and who uses it

ISO 13209-4 is intended for organizations that design, implement or integrate automated vehicle test sequences and toolchains:

• OEM test engineers creating standardized, reusable test sequences for ECUs and vehicle functions.
• Tool vendors and middleware developers implementing OTX runtimes, editors, validators, and converters.
• Diagnostics and flashing tool manufacturers who require formalized extension interfaces (e.g., DiagComPlus, FlashPlus).
• Systems integrators managing test automation pipelines that exchange OTX/PTX artifacts across teams and tools.
• Validation and verification teams using standardized assertions, state machines and test result handling to ensure consistent interpretation.

By formalizing extension syntax and semantics, ISO 13209-4 improves interoperability, reduces integration effort, and supports robust automated testing and diagnostics across the automotive supply chain.

Related standards

• ISO 13209-1 (OTX use cases and core concepts) - the requirements in Part 4 are derived from the use cases described in Part 1.
• Other parts of ISO 13209 (OTX family) provide complementary specifications for core OTX behavior and packaging.

For implementation and compliance, obtain the full ISO 13209-4:2024 text from ISO or your national standards body.