> ## Documentation Index > Fetch the complete documentation index at: https://docs.open-metadata.org/llms.txt > Use this file to discover all available pages before exploring further. # Knowledge Graph API Reference | OpenMetadata > Every REST endpoint under /api/v1/rdf — status, SPARQL, graph exploration, validation, inference rules, insights, and Linked Open Data. # Knowledge Graph API Reference All endpoints live under `/api/v1/rdf` unless noted. Every one returns **503** when RDF is disabled. Authenticate with a bearer token: ```bash theme={null} export OM_HOST=http://localhost:8585 export TOKEN= ``` Most knowledge-graph endpoints are **admin-only**. Graph node hydration resolves entity details without re-applying the caller's per-entity view authorization, so opening these to non-admins would leak entities a user cannot otherwise see. The glossary-scoped ontology endpoints on `/api/v1/glossaries` are the non-admin path. ## Status | Endpoint | Access | Returns | | - | - | - | | `GET /status` | Authenticated | `baseUri`, `enabled`, `storageType`, `inference` (`enabled`, `defaultLevel`, `availableLevels`), `projectionState` (`DISABLED` / `READY` / `REBUILDING` / `DEGRADED`), `askCollateEnabled` | ## SPARQL | Endpoint | Access | Notes | | - | - | - | | `GET /sparql` | Admin | `query`, `format` (`json`, `xml`, `csv`, `tsv`), `inference` (`none`, `rdfs`, `owl`, `custom`) | | `POST /sparql` | Admin | JSON body `{ "query": "...", "format": "...", "inference": "..." }` | | `POST /sparql/update` | Admin | SPARQL UPDATE. See the warning below. | | `GET /queries/saved` | Authenticated | The caller's private saved queries. | | `PUT /queries/saved` | Authenticated | Replace the caller's saved queries. | | `GET /queries/templates` | Authenticated | Installation-wide shared query templates. Writes are admin-only, via system settings. | `POST /sparql/update` writes directly to a derived index. Anything you write is discarded on the next reindex. Use the entity APIs to change your catalog. ## Entities and Graph | Endpoint | Access | Notes | | - | - | - | | `GET /entity/{entityType}/{id}` | Admin | The entity as RDF. `format`: `jsonld` (default), `turtle`, `rdfxml`, `ntriples`. | | `GET /entity/{entityType}/{id}/diff` | Admin | Diff two RDF versions of an entity. | | `GET /graph/explore` | Admin | `entityId`, `entityType`, `depth` (default 2), `entityTypes`, `relationshipTypes` (comma-separated filters). | | `GET /graph/explore/export` | Admin | Same parameters plus `format`: `turtle` (default) or `jsonld`. | | `GET /ontology` | Authenticated | Download the canonical OpenMetadata ontology. | | `GET /glossary/graph` | Authenticated | Glossary term relationship graph. See parameters below. | | `GET /glossary/{id}/export` | Authenticated | Export a glossary as an ontology. | | `GET /inference/lineage/{entityId}` | Admin | Full lineage with inference applied. Requires `entityType`. | | `GET /debug/glossary-relations` | Admin | Diagnostic view of glossary relations in RDF. | ### `GET /glossary/graph` Parameters | Parameter | Default | Purpose | | - | - | - | | `glossaryId` | — | Scope primary terms to one glossary. | | `glossaryTermId` | — | Scope to one term and its direct incoming/outgoing relations. | | `relationTypes` | — | Comma-separated relation types to include. | | `limit` | `500` | Maximum terms returned. | | `offset` | `0` | Pagination offset. | | `includeIsolated` | `true` | Include terms with no relations. | Passing both `glossaryId` and `glossaryTermId` requires the term to belong to that glossary while still returning direct cross-glossary neighbors. ## Validation | Endpoint | Access | Notes | | - | - | - | | `POST /validate` | Admin | SHACL validation. `entityUri` to scope to one entity (omit for the whole dataset), `format`: `turtle` (default) or `jsonld`. Response carries an `OM-SHACL-Conforms` header. | ## Inference Rules | Endpoint | Access | Notes | | - | - | - | | `GET /rules` | Admin | Rules with `dirty`, `graphUri`, `tripleCount`, `lastMaterializedAt`, `lastError`, `systemRule`. | | `GET /rules/{name}` | Admin | One rule. | | `PUT /rules/{name}` | Admin | Create or update. Marks the rule dirty. | | `DELETE /rules/{name}` | Admin | Delete a custom rule and drop its graph. System rules cannot be deleted. | | `POST /rules/validate` | Admin | Validate a rule body without saving. | | `POST /rules/materialize` | Admin | Materialize now. | ## Custom Ontology Extensions | Endpoint | Access | | - | - | | `GET /ontology/extensions` | Admin | | `GET /ontology/extensions/{name}` | Admin | | `PUT /ontology/extensions/{name}` | Admin | | `DELETE /ontology/extensions/{name}` | Admin | | `POST /ontology/extensions/validate` | Admin | Custom classes and properties must be in `https://open-metadata.org/ontology-extension/`. ## Insights | Endpoint | Parameters | | - | - | | `GET /insights/important` | `entityType` (required), `window` (`daily`/`weekly`/`monthly`), `limit` (1–100, default 20) | | `POST /insights/recompute-centrality` | `entityType` (required) | | `POST /insights/recompute-communities` | `entityType` (required), `graphType` (`lineage`/`tagCoOccurrence`) | | `GET /insights/communities` | `entityType` (required), `graphType` | | `GET /insights/path` | `from`, `to` (required URIs), `direction` (`upstream`/`downstream`/`both`), `maxHops` (1–25, default 6) | | `GET /insights/recommendations` | `entityUri` (required), `limit` (1–50, default 10) | | `GET /insights/tag-cooccurrence` | `minCount` (default 2), `limit` (1–100, default 20) | | `GET /insights/glossary-reach` | `minDomains` (default 2), `limit` (1–100, default 20) | | `GET /insights/tag-popularity` | `limit` (1–100, default 20) | All admin-only. ## Semantic Search | Endpoint | Notes | | - | - | | `GET /search/semantic` | Vector search over the graph. **Requires OpenSearch.** | | `GET /search/similar/{entityType}/{id}` | Similar entities. **Requires OpenSearch.** | | `GET /search/recommendations/{userId}` | Per-user recommendations. **Requires OpenSearch.** | ## SQL → SPARQL | Endpoint | Notes | | - | - | | `POST /sql/translate` | Translate SQL to SPARQL. | | `POST /sql/query` | Translate and execute. | ## Linked Open Data | Endpoint | Notes | | - | - | | `GET /api/v1/lod/entity/{entityType}/{id}` | Authenticated, content-negotiated redirect for a minted IRI. Requires `RDF_DEREFERENCEABLE_IRIS=true`. | ## Glossary Ontology Endpoints These live under `/api/v1/glossaries` and — importantly — **work with RDF storage disabled**, because they read the database-primary model. | Endpoint | Access | Notes | | - | - | - | | `PUT /api/v1/glossaries/name/{name}/importRdf` | `EditAll` on the glossary | `format` (`turtle`, `rdfxml`, `ntriples`, `jsonld`), `dryRun` (default `true`). | | `GET /api/v1/glossaries/{id}/exportOntology` | `ViewAll` | `format`, `includeRelations` (default `true`). | | `POST /api/v1/glossaries/{id}/sparql` | `ViewAll` | Read-only SPARQL scoped to that glossary. No `SERVICE`, no other assets. | ## Applications | Application | Purpose | | - | - | | `RdfIndexApp` — **RDF Knowledge Graph Indexing** | Initial index and full rebuilds. Config: `entities`, `recreateIndex` (default `true`), `batchSize` (100), `producerThreads` (2), `consumerThreads` (3), `queueSize` (5000), `useDistributedIndexing` (default `true`), `partitionSize` (10000). | | `RdfInferenceApp` — **RDF Inference Materialization** | Materializes enabled inference rules into their durable per-rule named graphs. Runs on a schedule (**every 5 minutes** by default); use **Run Now** in **Settings → Applications** to materialize immediately. | ```bash theme={null} # Trigger a full reindex curl -X POST "$OM_HOST/api/v1/apps/trigger/RdfIndexApp" -H "Authorization: Bearer $TOKEN" # Status curl "$OM_HOST/api/v1/apps/name/RdfIndexApp/status" -H "Authorization: Bearer $TOKEN" # Stop a long-running index curl -X POST "$OM_HOST/api/v1/apps/stop/RdfIndexApp" -H "Authorization: Bearer $TOKEN" ``` Only one reindex job can be active per cluster at a time. ## Next Ontology authoring endpoints. The same capabilities, for agents. 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