SPARQL End Point

qwikidata.sparql

Description

Wikidata provides endpoints to process SPARQL queries,

SPARQL queries can be submitted directly to the SPARQL endpoint with GET request to https://query.wikidata.org/bigdata/namespace/wdq/sparql?query={SPARQL} or the endpoint’s alias https://query.wikidata.org/sparql?query={SPARQL}. The result is returned as XML by default, or as JSON if either the query parameter format=json or the header Accept: application/sparql-results+json are provided. See the user manual for more detailed information.

—https://www.wikidata.org/wiki/Wikidata:SPARQL_query_service

You can find their GUI implementation here https://query.wikidata.org/

Example

We can find all items that are in the subclass tree of river. Note that,

• subclass of is P279

• river is Q4022

from qwikidata.sparql import return_sparql_query_results

query_string = """
SELECT $WDid
WHERE {
  ?WDid (wdt:P279)* wd:Q4022
}
"""

results = return_sparql_query_results(query_string)

Alternatively, we can find all items that have river in their subclass tree.

from qwikidata.sparql import return_sparql_query_results

query_string = """
SELECT $WDid
WHERE {
  wd:Q4022 (wdt:P279)* ?WDid
}
"""

results = return_sparql_query_results(query_string)