A Retrieval‑Augmented Generation (RAG) system is only as trustworthy as the evidence it can show about where its content came from.
The PROV‑O (Provenance Ontology) lets you describe who produced data, when, where, and why, and ties those facts together across every step of the pipeline.
Below we focus on building and using a PROV‑O‑based lineage graph that follows a document from ingestion to answer generation.

1. What is Data Lineage?

Data lineage is the audit trail that tracks a piece of data through its life cycle: