ISO 13209-4:2021

Overview

ISO 13209-4:2021 specifies the expanded extensions interface definition for the Open Test sequence eXchange (OTX) format used in road-vehicle test automation. Building on the use cases in ISO 13209‑1, this part defines additional extension requirements and an exhaustive data model for OTX extension features. Syntax is given by UML class diagrams and XML schemas; semantics are defined with UML activity diagrams and prose. Clause 4 enumerates the derived requirements; the standard also covers packaging (PTX) and dependency rules for extensions.

Key topics and technical requirements

• Extension requirements (Clause 4): A structured listing of extension requirements derived from OTX Part 1 use cases, covering assertion, communication, diagnostics, and more.
• Data model specification: Exhaustive definitions of extension features, including types, structures and inter-dependencies to ensure consistent interpretation.
• Syntax and semantics:
  • Syntax: UML class diagrams and XML schemas for each syntactical entity.
  • Semantics: UML activity diagrams and textual definitions that dictate runtime interpretation.
• Extension modules (examples from TOC): Assertion, BlackBox, BusMonitoring, ComInterface, CommonDialogs, DataType, DiagComPlus, DiagConfiguration, FlashPlus, Persistence, SQL, StateMachineProcedure, TestResultHandling, VehicleInfo, XML, ZipHandling, and more.
• OTX packaging (PTX): Rules for packaging OTX assets and extension content for exchange and deployment.
• Dependency management: Definition of how extensions depend on each other and on base OTX features.

Applications

ISO 13209-4 is practical for any organization that needs standardized, interoperable test sequences and extension handling in automotive testing:

• Creating and exchanging OTX test sequences with extended capabilities (e.g., ECU configuration, bus monitoring, flashing).
• Implementing toolchains that parse and execute OTX with non‑core extension features via XML schema validation and UML-driven semantics.
• Ensuring consistent interpretation of advanced test constructs (exceptions, actions, variable access, enumerations).
• Packaging and distributing test assets using PTX containers.

Who uses this standard

• Automotive test engineers and system integrators who author or execute OTX sequences.
• Tool and test framework vendors implementing OTX runtimes or editors.
• OEMs and suppliers needing interoperable test content exchange.
• Diagnostic and ECU test teams requiring formalized semantics for extensions (e.g., BusMonitoring, DiagComPlus).

Related standards

• ISO 13209‑1 (OTX - use cases and base definitions) and other parts of the ISO 13209 series.
• Complementary vehicle test and diagnostic specifications used within OEM tool ecosystems.

Keywords: ISO 13209-4, OTX, Open Test sequence eXchange, XML schemas, UML, PTX, vehicle test automation, bus monitoring, ECU diagnostics, test sequence extensions.