Interact with an Ontop SPARQL Endpoint

An Ontop Endpoint is accessible by the standard SPARQL HTTP protocol (opens new window)

URL of the Ontop SPARQL Endpoint

When the endpoint is created by the Ontop CLI or Docker, the URL looks like http://localhost:8080/sparql.

Sending HTTP Requests

You can use POST or GET requests carrying the SPARQL query to evaluate (as per SPARQL HTTP protocol).

For example, with POST:

POST http://localhost:8080/sparql
Content-Type: application/sparql-query
Accept: application/json
PREFIX : <http://example.org/voc#>
SELECT DISTINCT ?teacher {
  ?teacher a :Teacher .
}

Using cURL from the command line

The above request can be sent with the cURL command:

curl --request POST \
     --url http://localhost:8080/sparql \
     --header 'accept: application/json' \
     --header 'content-type: application/sparql-query' \
     --data 'PREFIX : <http://example.org/voc#> SELECT DISTINCT ?teacher {?teacher a :Teacher .}'

Using a SPARQL client library

Alternatively, you may use one of the many SPARQL clients (opens new window) available for many programming and data analysis environments, as we demonstrate next using the SPARQLWrapper library within a Python Jupyter Notebook.