# Ontology Engineering
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##### Ontology Engineering REST API
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The following API surface defines the contract for Ontology Management & Knowledge Engineering UIs, services, and agents to interact with the Semantic Layer.


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| 
| Operation | Method | Endpoint | Request Content-Type | Response Accept | Notes | 
| --- |--- |--- |--- |--- |--- |
| Import Ontology | POST | `/ontologies` | `text/turtle`, `application/n-quads`, `application/n-triples`, `application/trig`, `application/rdf+xml`, `application/ld+json` | — | Multipart or body; format auto-detected from Content-Type | 
| Export Ontology | GET | `/ontologies/{id}/export` | — | `text/turtle` (default), `application/n-quads`, `application/n-triples`, `application/trig`, `application/rdf+xml`, `application/ld+json` | Returns `406 Not Acceptable` for unsupported types | 
| Get Ontology | GET | `/ontologies/{id}` | — | `text/turtle`, `application/ld+json` | Returns ontology metadata \+ IRI | 
| List Ontologies | GET | `/ontologies` | — | `application/json` | Supports pagination, filter by namespace/domain | 
| Delete Ontology | DELETE | `/ontologies/{id}` | — | — | Soft-delete with version retention |