# Extension

- [Concepts](/openapi/openapi-v2/api-reference/taxonomy/extension/concepts.md): OpenAPI V2
- [Linkroles](/openapi/openapi-v2/api-reference/taxonomy/extension/linkroles.md): OpenAPI V2
- [Pivot](/openapi/openapi-v2/api-reference/taxonomy/extension/pivot.md): OpenAPI V2