# Sample bundle C — foreign-key-style relationships (value-flow REA)

**The property this bundle proves:** links as join paths. Fourteen concepts in three REA classes — five EconomicAgents, three EconomicResources, six EconomicEvents — modeling a generic specialty-coffee value chain (no client data). Every event links its provider agent, its receiver agent, and the resource that moves: the same give/receive/flow triple a relational schema would express as foreign keys. Paired events (purchase and payment, shipment and settlement) link each other as duality, closing each exchange.

Each concept's `resource:` and `shuriq_rea_type` reference the shared [REA meta-ontology bundle](../../../meta-ontologies/rea/index.md), so the class definitions live once and every instance bundle points at them.

## Rebuild it

```bash
# from projects/shur/okf/
python3 okf_rea_sample.py _site/samples/value-flow-rea/bundle
python3 okf_viz.py _site/samples/value-flow-rea/bundle _site/samples/value-flow-rea/viz.html
```

- [Open the graph](viz.html)
- [Browse the bundle root](bundle/index.md)