ASAM Open X Ontology Overview

What is ASAM Open X Ontology?

ASAM Open X Ontology is an ongoing project started in April 2020 to create a domain model of load traffic using ontology. It defines the concept of load traffic. The created domain model serves as a common basis for the ASAM OpenX standard (Open Scenario, Open Drive, Open CRG, OSI, OpenLabel, OpenODD).

Relationship between Open Ontology and each Open X standard:

Source: ASAM (

Open Label Roadmap and Open Ontology

Source: ASAM (

The following is an example of the concept that the domain model covers. The domain model defines entity definitions, required/optional attributes of entities, relationships between entities, atomic operations at an abstract level, etc.

The domain model will be divided into 5 or 6 layers and will cover the layers defined in the Pegasus project. Ontologies are divided into three categories: Core, Domain, and Application.

Road infrastructure:

  • Temporary infrastructure such as construction work
  • Traffic participants
  • Transportation objects such as signs
  • Description of environment such as weather and time
  • Objects of interest
  • Scenario label

Relationship with standardization by other organizations

ASAM Open X Ontology is considering using the following standards:

  • W3C Semantic Web: Utilization of Web Ontology Language (OWL).
  • ISO704: For domain modeling, take the same approach method as ISO704.
  • ISO15926: Considering the use of ISO15926 as a higher-level ontology.

Use Case

The following use cases are considered in ASAM Open X Ontology.

  • Scenario description
  • Foundation for defining common ASAM OpenX concepts
  • Language base of stakeholders
  • Natural language interface
  • Semantic error checking
  • Semantic search and matching
  • Creating an application-specific ontology by extending the core ontology
  • Common core ontology for data analysis
  • Classification using logical reasoning

A user

The domain model covers the following user perspectives and sets goals for each.

A User

User definition


Test engineer

  • Run the test case
  • Participate in DVP&R (design verification/verification plan and report)
  • Use scenarios defined by standard ontologies that can be interpreted by various driving simulators and XIL devices

Exchange of well-defined data
Run test cases on different platforms
Use of natural/intuitive language

Developer of the ASAM standard

Engineers with automotive or software experience participating in the ASAM project to implement or extend the ASAM OpenX standard.

Create guidelines that describe how Open X Ontology interacts with other Open X standards.

Ontology experts, administrators

Ontology specialists and managers with backgrounds such as software engineering and linguistics

Develop an extensible domain model that can be used by many stakeholders in various programming environments and subdomains

Label annotator

A person who creates or edits labels (objects and scene classes and attributes) related to the scene

Create accurate and searchable labels for machine learning, XiL ground truth and scene databases

Public domain users

Non-ASAM users who want to access Open X data content

Adopt Rest API and support data formats such as RDF, RDF-S, OWL, JSON
Providing guidelines on API creation methods using technologies such as SPARQL

Tool developer

A person who creates tools for autonomous driving development

Simulation with ground truth data
Provides a large set of scenarios for functional testing

Scenario creator

Those who want to create a scenario description in text (natural language or technical format such as XML) or graphically

Create/write scenario descriptions as text or images based on a well-defined core ontology

Automotive development, functional design engineer

A person who creates and reviews specifications for automobile function development

Data exchange and disambiguation of documents
Use clear and intuitive natural language style notation
Shortening development lifecycle time by avoiding redefinition of internal ontology

Data scientist

A person who supports or makes decision-makers so that they can make rational decisions based on data

Data exchange and disambiguation of documents
Stay compatible with past versions

ODD Designer

ODD designer
Specify system performance
Specify system architecture based on performance

Clear ODD definition
Derive a scenario from ODD

System design engineer

System and subsystem designers
Specify the function (eg ODD, function/abstract scenario)
Specify architecture (system, features, firmware, hardware, software)

Common understanding (and traceability) among all relevant engineers in product development
Foundation of ODD (+functional scenario) definition
Remove ambiguity when exchanging data

What is ASAM?

ASAM is an abbreviation for “International Standardization Organization for Automation and Measurement Systems”. ASAM's vision is to provide compatibility for all tools in the development process chain and consistency in data exchange.

For details on the ASAM organization, see the following URL:

Our activities at ASAM

This is a timeline focusing on the activities of Japan and ASAM. We participate in OpenX Ontology, OpenScenario1.0, OpenScenario2.0, Open Label as an active member and are implementing standard creation activities. If you would like information about these activities, please feel free to contact us.

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