Certvas Ontology v0.1.0 — the open schema for African and emerging-market company and asset data

The Certvas Ontology is a LinkML schema describing company, fundamentals, procurement and macro data for African and emerging markets. One YAML file is the source of truth; Pydantic models, SQL DDL, JSON Schema and a JSON-LD context are generated from it. It models a point-in-time contract explicitly: every fundamentals record carries an effective date (period_end) and an availability date (available_at), so a backtest can exclude values that were not yet public. Announcement dates are evidenced or null, never inferred, and the evidence tier travels with the value. The schema is CC0. The data it describes is not. Datasets published by Certvas carry their own per-source licence terms, recorded per row. Python package: pip install certvas-ontology