W3C PROV-O
A W3C web standard for recording where data and content came from, what processes created or modified it, and who was responsible, in a format machines can read and verify.
The Simple Version
A W3C web standard for recording where data and content came from, what processes created or modified it, and who was responsible, in a format machines can read and verify.
Detailed Explanation
W3C PROV-O (PROV Ontology, 2013) provides a vocabulary for representing provenance as a graph of entities (things), activities (processes), and agents (actors), with relationships such as wasDerivedFrom, wasGeneratedBy, wasAttributedTo, and used. It enables provenance assertions to be published as Linked Data, linked across systems, and reasoned over. In AI governance contexts, PROV-O can represent the provenance and lineage of training datasets, model artefacts, and AI-generated outputs, supporting the transparency and auditability requirements of EU AI Act technical documentation and NIST AI RMF guidance.
Key Characteristics
- W3C OWL ontology for representing provenance in RDF/Linked Data
- Core entities: Entity, Activity, Agent with relationships between them
- Enables machine-readable provenance chains interoperable across systems
- Applicable to training data, model artefacts, and AI output provenance
Why It Matters
Data engineering teams building AI data pipelines can use PROV-O to generate machine-readable provenance records automatically, creating interoperable audit trails that satisfy governance requirements without additional documentation overhead.
Real-World Analogy
Like a standardised digital chain-of-custody form that any authorised party can read and verify. PROV-O provides a common format for recording who created, modified, and used each data item.
Common Misconceptions
- PROV-O is only for academic research settings, it is used in production by government agencies, data platforms, and scientific data repositories for operational provenance management.
- PROV-O and data lineage tools are interchangeable. PROV-O is a semantic standard for representing provenance; data lineage tools are software implementations that may or may not expose their data in PROV-O format.