# Metric Definition REST API
<a name="metric-definition-rest-api"></a>


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| Operation | Method | Endpoint | Request Content-Type | Response Accept | Notes | 
| --- |--- |--- |--- |--- |--- |
| List Metrics | GET | /ontologies/{id}/versions/{versionId}/metrics | - | application/json | List all metric definitions for an ontology version | 
| Get Metric | GET | /ontologies/{id}/versions/{versionId}/metrics/{metricId} | - | text/turtle |  | 
| Create Metric | POST | /ontologies/{id}/versions/{versionId}/metrics | text/turtle | - | application/json | 
| Update Metric | PUT | /ontologies/{id}/versions/{versionId}/metrics/{metricId} | text/turtle | - | application/json | 
| Delete Metric | DELETE | /ontologies/{id}/versions/{versionId}/metrics/{metricId} | - | application/json | Soft-delete; governed by approval workflow | 
| Validate Metric | POST | /ontologies/{id}/versions/{versionId}/metrics/{metricId}/validate | - | application/json | Test pre-compiled expression against sample data via VKG | 
| Publish Metric | POST | /ontologies/{id}/versions/{versionId}/metrics/{metricId}/publish | - | application/json | Promote from draft to published |