Overview
ISO 14817-3:2017 - "Intelligent transport systems - ITS data dictionaries - Part 3: Object identifier assignments for ITS data concepts" specifies how to assign an object identifier (OID) to an ITS data concept under the "its" arc of the international OID tree. The standard defines the naming tree, conformance prerequisites, management and registration practices, and formally supplies an ASN.1 module (Annex A) and guidance (Annex B). Its purpose is to maximize interoperability, enable efficient encoding, and reduce duplication across ITS data dictionaries via the Central ITS Data Concept Registry (CIDCR).
Key topics and technical requirements
- OID placement: Recommends assigning values under the its (28) arc of the joint-iso-itu-t(2) root for consistency and encoding benefits (including efficient use of RELATIVE OID).
- ASN.1 OBJECT IDENTIFIER: Assigned values must be valid ASN.1 OBJECT IDENTIFIERs and conform to ISO/IEC 9834-1 and ISO/IEC 8824-1 rules.
- CIDCR registration: Before an arc/OID can be standardized under the “its” arc, the data concept must be entered in the CIDCR and reach quality level “recorded” (or higher).
- Conformance checks: Verify contextual name, parent object class, unambiguous definition, correct context/module reference, and data type conformity per ISO 14817-1.
- ITS naming tree structure: Defines major arcs (e.g., its-misc arc 0) and sub-arcs such as member-body arcs (using ISO 3166-1 three‑digit country codes).
- Management topics: Processes for registering data concepts, versioning, and obtaining a dictionary document arc are covered.
- Deliverables: Normative ASN.1 module (Annex A) and FAQs on subtle data variations (Annex B).
Applications and who uses it
- ITS architects and system integrators standardize OIDs for messages, data elements, value domains and aggregates to enable consistent cross-system exchange.
- Application developers and equipment providers use assigned OIDs for encoding, protocol design, and implementation to ensure interoperability.
- Standards bodies and national member bodies register country-specific data concepts under member-body arcs (e.g., ISO 3166 three-digit codes).
- CIDCR managers and registry maintainers administer arcs, versioning and ensure data concepts meet conformance requirements.
Benefits / Practical value
- Promotes harmonization and reuse of ITS data concepts across domains.
- Reduces duplication and inconsistent definitions.
- Enables efficient encodings (RELATIVE OID) and easier discovery of related data concepts via the CIDCR.
Related standards
Keywords: ISO 14817-3:2017, ITS data dictionaries, object identifier, OID, CIDCR, ITS naming tree, ASN.1, interoperability.
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