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SPARQLAsk[pattern]

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

Details and Options
Details and Options Details and Options
Examples  
Basic Examples  
Scope  
See Also
Related Guides
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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 and Options

  • 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)

Wolfram Language code: Needs["GraphStore`"]

Data about fruits:

Wolfram Language code: schema[s_] := URL["http://schema.org/" <> s]; ex[s_] := URL["http://example.org/" <> s];
Wolfram Language code: fruitGraph = RDFStore[{ RDFTriple[ex["banana"], schema["color"], "yellow"], RDFTriple[ex["strawberry"], schema["color"], "red"], RDFTriple[ex["strawberry"], ex["shape"], ex["round"]] }];

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

Wolfram Language code: fruitGraph//SPARQLAsk[{ RDFTriple[SPARQLVariable["fruit"], schema["color"], "red"], RDFTriple[SPARQLVariable["fruit"], ex["shape"], ex["rectangular"]] }]

A red and round fruit exists:

Wolfram Language code: fruitGraph//SPARQLAsk[{ RDFTriple[SPARQLVariable["fruit"], schema["color"], "red"], RDFTriple[SPARQLVariable["fruit"], ex["shape"], ex["round"]] }]

Scope  (1)

Wolfram Language code: Needs["GraphStore`"]

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

Wolfram Language code: rdfs[s_] := URL["http://www.w3.org/2000/01/rdf-schema#" <> s]; wd[s_] := URL["http://www.wikidata.org/entity/" <> s]; wdt[s_] := URL["http://www.wikidata.org/prop/direct/" <> s];
Wolfram Language code: SPARQLExecute[ "https://query.wikidata.org/sparql", SPARQLAsk[{ RDFTriple[SPARQLVariable["human"], wdt["P31"], wd["Q5"]], RDFTriple[SPARQLVariable["human"], rdfs["label"], RDFString["Albert Einstein", "de"]] }] ]
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.

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

BibTeX

@misc{reference.wolfram_2026_sparqlask, author="Wolfram Research", title="{SPARQLAsk}", year="2019", howpublished="\url{https://reference.wolfram.com/language/GraphStore/ref/SPARQLAsk.html}", note=[Accessed: 13-June-2026]}

BibLaTeX

@online{reference.wolfram_2026_sparqlask, organization={Wolfram Research}, title={SPARQLAsk}, year={2019}, url={https://reference.wolfram.com/language/GraphStore/ref/SPARQLAsk.html}, note=[Accessed: 13-June-2026]}