# Ontology Version Management
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##### Ontology Version Management REST API
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| Operation | Method | Endpoint | Request Content-Type | Response Accept | Notes | 
| --- |--- |--- |--- |--- |--- |
| List Versions | GET | `/ontologies/{id}/versions` | — | `application/json` | Returns version history with timestamps and authors | 
| Get Version | GET | `/ontologies/{id}/versions/{versionId}` | — | `text/turtle`, `application/n-quads`, `application/trig` | Retrieve a specific version snapshot; N-Quads recommended for provenance-aware retrieval | 
| Publish Version | POST | `/ontologies/{id}/versions/{versionId}/publish` | — | `application/json` | Publish ontology version | 
| Diff Versions | GET | `/ontologies/{id}/versions/diff?from={v1}&to={v2}` | — | `application/json`, `text/turtle` | Returns added/removed/changed axioms | 
| Rollback | POST | `/ontologies/{id}/versions/{versionId}/rollback` | — | `application/json` | Restore a prior version as active |