query_wikidata function

Send one or more SPARQL queries to WDQS

Makes a POST request to Wikidata Query Service SPARQL endpoint.

query_wikidata(sparql_query, format = c("simple", "smart"))

Arguments

• sparql_query: SPARQL query (can be a vector of queries)
• format: "simple" uses CSV and returns pure character data frame, while "smart" fetches JSON-formatted data and returns a data frame with datetime columns converted to POSIXct

Returns

A tibble data frame

Query limits

There is a hard query deadline configured which is set to 60 seconds. There are also following limits:

• One client (user agent + IP) is allowed 60 seconds of processing time each 60 seconds

• One client is allowed 30 error queries per minute See query limits section

  in the WDQS user manual for more information.

Examples

sparql_query <- "SELECT
  ?softwareVersion ?publicationDate
WHERE {
  BIND(wd:Q206904 AS ?R)
  ?R p:P348 [
    ps:P348 ?softwareVersion;
    pq:P577 ?publicationDate
  ] .
}"
query_wikidata(sparql_query)

## Not run:

query_wikidata(sparql_query, format = "smart")
## End(Not run)

See Also

get_example