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SELECT response returned as JSON

This example asks QLever for Turtle while running a SELECT query. The endpoint returns SPARQL Results JSON, and Vitrify records that actual response type even though the requested format determines the results.ttl filename.

echo 'PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>

SELECT ?person ?personName WHERE {
  ?person rdfs:label ?personName .
  FILTER(LANG(?personName) = "en")
}
LIMIT 3' |
  vitrify sparql \
  --endpoint https://qlever.dev/api/wikidata \
  --query - \
  --format turtle \
  --to select-turtle

select-turtle/
├── query.rq
├── results.ttl
└── ro-crate-metadata.json 

PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>

SELECT ?person ?personName WHERE {
  ?person rdfs:label ?personName .
  FILTER(LANG(?personName) = "en")
}
LIMIT 3

query.rq

person personName
http://www.wikidata.org/entity/L10 describe
http://www.wikidata.org/entity/L1000000-S1 etymology
http://www.wikidata.org/entity/L1000001-S1 dialectology

results.ttl

{
  "@context": "https://w3id.org/ro/crate/1.2/context",
  "@graph": [
    {
      "@id": "ro-crate-metadata.json",
      "@type": "CreativeWork",
      "about": {
        "@id": "./"
      },
      "conformsTo": {
        "@id": "https://w3id.org/ro/crate/1.2"
      }
    },
    {
      "@id": "./",
      "@type": "Dataset",
      "author": {
        "@id": "https://vitrify.iolanta.tech"
      },
      "datePublished": "2026-10-04T18:49:01.098558752+00:00",
      "description": "SPARQL retrieval materialized by Vitrify.",
      "hasPart": [
        {
          "@id": "results.ttl"
        },
        {
          "@id": "query.rq"
        }
      ],
      "license": "No license asserted by Vitrify; consult the source endpoint's terms of use.",
      "name": "results.ttl",
      "publisher": {
        "@id": "https://qlever.dev/api/wikidata"
      }
    },
    {
      "@id": "results.ttl",
      "@type": "File",
      "contentSize": "550",
      "encodingFormat": "application/sparql-results+json",
      "sha256": "efcd3f1ad3f8c2a9b152be8a6e057df8402c77b142a07d6ed8fd91b7053c0d82"
    },
    {
      "@id": "query.rq",
      "@type": "File",
      "contentSize": "169",
      "encodingFormat": "application/sparql-query",
      "sha256": "47300242cfaa497f2b78404a96c9d5a170846e43038d9e7b9edc7a7cbd2fd81e"
    },
    {
      "@id": "https://vitrify.iolanta.tech",
      "@type": "SoftwareApplication",
      "name": "Vitrify",
      "url": "https://vitrify.iolanta.tech",
      "version": "0.1.0"
    },
    {
      "@id": "https://qlever.dev/api/wikidata",
      "@type": "Organization"
    },
    {
      "@id": "#retrieval",
      "@type": "CreateAction",
      "agent": {
        "@id": "https://vitrify.iolanta.tech"
      },
      "description": "HTTP 200; Accept: text/turtle",
      "endTime": "2026-10-04T18:49:01.098558752+00:00",
      "identifier": "https://qlever.dev/api/wikidata",
      "instrument": {
        "@id": "https://vitrify.iolanta.tech"
      },
      "object": [
        {
          "@id": "https://qlever.dev/api/wikidata"
        },
        {
          "@id": "query.rq"
        }
      ],
      "result": {
        "@id": "results.ttl"
      },
      "startTime": "2026-10-04T18:49:00.278195863+00:00"
    }
  ]
}

ro-crate-metadata.json