GraphStore`
GraphStore`

SPARQLAsk

SPARQLAsk[pattern]

is a query operator that can be applied to an RDFStore, which returns True if pattern matches, and False otherwise.

Details

  • SPARQLAsk can be used in SPARQLExecute to query a SPARQL endpoint.
  • The result of executing SPARQLAsk[pattern] is True if there is a subgraph matching pattern, and False otherwise.
  • In SPARQLAsk[pattern], pattern can take the same form as in SPARQLSelect[pattern].

Examples

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Basic Examples  (1)

Data about fruits:

Check whether there is a fruit that is both red and rectangular:

A red and round fruit exists:

Scope  (1)

Ask Wikidata whether there is a human (Q5) with German label "Albert Einstein":

Wolfram Research (2019), SPARQLAsk, Wolfram Language function, https://reference.wolfram.com/language/GraphStore/ref/SPARQLAsk.html.

Text

Wolfram Research (2019), SPARQLAsk, Wolfram Language function, https://reference.wolfram.com/language/GraphStore/ref/SPARQLAsk.html.

BibTeX

@misc{reference.wolfram_2021_sparqlask, author="Wolfram Research", title="{SPARQLAsk}", year="2019", howpublished="\url{https://reference.wolfram.com/language/GraphStore/ref/SPARQLAsk.html}", note=[Accessed: 18-June-2021 ]}

BibLaTeX

@online{reference.wolfram_2021_sparqlask, organization={Wolfram Research}, title={SPARQLAsk}, year={2019}, url={https://reference.wolfram.com/language/GraphStore/ref/SPARQLAsk.html}, note=[Accessed: 18-June-2021 ]}

CMS

Wolfram Language. 2019. "SPARQLAsk." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/GraphStore/ref/SPARQLAsk.html.

APA

Wolfram Language. (2019). SPARQLAsk. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/GraphStore/ref/SPARQLAsk.html