NDE Dataset Register

Base URL

https://datasetregister.netwerkdigitaalerfgoed.nl/sparql

Endpoints 7

• GET/sparql?query=…SPARQL query in the URL. With Accept: application/json or application/sparql-results+json the standard JSON, text/csv a table. The response also has meta.query-time-ms.
• POST/sparqlThe same query as form field query= (handy for long queries).
• GET/api/datasets?url=…REST: is a description at this URL already registered?
• POST/api/datasetsREST: register a dataset description (for institutions; see allowed-domains).
• POST/api/datasets/validateREST: validate a description in the body against the NDE requirements; PUT with a URL validates what is at that address.
• GET/api/shaclREST: the SHACL shape used to validate descriptions.
• GET/api/allowed-domains?url=…REST: is the domain on the allow list?

Filtering tested

SPARQL 1.1 with prefixes dcat: <http://www.w3.org/ns/dcat#>, dct: <http://purl.org/dc/terms/>, schema: <https://schema.org/> (https). FILTER(CONTAINS(LCASE(?title), "…")) for text search.

Parameters 3

Predicates of a dataset and its distributions (selection) 14

Limits and pitfalls

• No documented limit or key. Counts over the whole register took 50 to 70 ms. tested
• robots.txt only disallows search.php, show.php and viaurl.php of the old app; /sparql and /api are allowed. tested
• Count only valid registrations (schema:subjectOf/schema:additionalType …/registry/valid): 3,392 on 16 Oct 2026 around 23:45, while 3,401 were counted earlier that day. The number fluctuates because the register keeps re-fetching descriptions. tested
• schema: here is https://schema.org/ (https), dct: is http://purl.org/dc/terms/ (with a slash). Different from the KB. tested
• Each registered description sits in its own graph (the registration URL); besides that there are graphs with registrations, ratings, SHACL results and distribution reachability (…/sparql/distribution-health). tested
• Counting licences by URI: CC0 appears as http:// (1,063) and https:// (34). Normalise before adding up. tested
• The register holds descriptions, not collection data: fetch the data from the institution via dcat:accessURL or dcat:downloadURL. from the description

Try it HTTP 200 · 391 ms · 16 Oct

https://datasetregister.netwerkdigitaalerfgoed.nl/sparql?query=PREFIX dcat%3A <http%3A%2F%2Fwww.w3.org%2Fns%2Fdcat%23> PREFIX dct%3A <http%3A%2F%2Fpurl.org%2Fdc%2Fterms%2F> PREFIX schema%3A <https%3A%2F%2Fschema.org%2F> SELECT %3Flicentie (COUNT(DISTINCT %3Fd) AS %3Fdatasets) WHERE { %3Fd a dcat%3ADataset %3B dct%3Alicense %3Flicentie %3B schema%3AsubjectOf%2Fschema%3AadditionalType <https%3A%2F%2Fdata.netwerkdigitaalerfgoed.nl%2Fregistry%2Fvalid> } GROUP BY %3Flicentie ORDER BY DESC(%3Fdatasets) LIMIT 5

{
  "head": {
    "vars": [
      "licentie",
      "datasets"
    ]
  },
  "results": {
    "bindings": [
      {
        "licentie": {
          "type": "uri",
          "value": "http://creativecommons.org/licenses/by/4.0/"
        },
        "datasets": {
          "datatype": "http://www.w3.org/2001/XMLSchema#int",
          "type": "literal",
          "value": "1832"
        }
      },
      {
        "licentie": {
          "type": "uri",
          "value": "http://creativecommons.org/publicdomain/zero/1.0/"
        },
        "datasets": {
          "datatype": "http://www.w3.org/2001/XMLSchema#int",
          "type": "literal",
          "value": "1063"
        }
      }
    ]
  },
  "meta": {
    "query-time-ms": 42,
    "result-size-total": 5
  }
}

Shortened response, saved at harvest time. Click the URL for the real, current response.