# Ontology API

`fs.ontology` is a `FoodOnAPI` — the lookup surface over the loaded FoodOn ontology,
used by the linker, the Layer A projection, and Layer C prompts. See the
[ontology concept page](../concepts/ontology.md) for loading and caching behaviour.

```{autoclass} foodscholar.ontology.api.FoodOnAPI
:members:
:member-order: bysource
```