> For the complete documentation index, see [llms.txt](https://docs.unitlab.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.unitlab.ai/documentation/ontologies.md).

# ONTOLOGIES

- [Ontologies overview](https://docs.unitlab.ai/documentation/ontologies/ontologies-overview.md): Navigate workspace and project ontologies, understand Live state, and inspect the complete semantic contract.
- [Classes and annotation types](https://docs.unitlab.ai/documentation/ontologies/classes-and-annotation-types.md): Create reusable concepts and choose geometry from the downstream task backward.
- [Properties, relations, and Item Properties](https://docs.unitlab.ai/documentation/ontologies/properties-relations-and-item-properties.md): Create typed schema content from the Ontology builder or directly from Annotation Workbench.
- [Validation and conditional logic](https://docs.unitlab.ai/documentation/ontologies/validation-and-conditional-logic.md): Configure Required state, type-aware validation, help text, and nested conditional branches.
- [Draft, Live, and version history](https://docs.unitlab.ai/documentation/ontologies/draft-live-and-version-history.md): Publish, inspect, restore, and compare ontology versions without silently mutating production history.
- [Test an ontology in Workbench](https://docs.unitlab.ai/documentation/ontologies/test-an-ontology-in-workbench.md): Attach or import the project ontology, make the intended copy Live, and exercise it in native annotation editors.