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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.

更多信息和选项
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范例  
基本范例  
Scope  
参见
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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.

更多信息和选项

  • 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].

范例

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基本范例  (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 语言函数，https://reference.wolfram.com/language/GraphStore/ref/SPARQLAsk.html.

文本

Wolfram Research (2019)，SPARQLAsk，Wolfram 语言函数，https://reference.wolfram.com/language/GraphStore/ref/SPARQLAsk.html.

CMS

Wolfram 语言. 2019. "SPARQLAsk." Wolfram 语言与系统参考资料中心. Wolfram Research. https://reference.wolfram.com/language/GraphStore/ref/SPARQLAsk.html.

APA

Wolfram 语言. (2019). SPARQLAsk. Wolfram 语言与系统参考资料中心. 追溯自 https://reference.wolfram.com/language/GraphStore/ref/SPARQLAsk.html 年

BibTeX

@misc{reference.wolfram_2025_sparqlask, author="Wolfram Research", title="{SPARQLAsk}", year="2019", howpublished="\url{https://reference.wolfram.com/language/GraphStore/ref/SPARQLAsk.html}", note=[Accessed: 01-May-2026]}

BibLaTeX

@online{reference.wolfram_2025_sparqlask, organization={Wolfram Research}, title={SPARQLAsk}, year={2019}, url={https://reference.wolfram.com/language/GraphStore/ref/SPARQLAsk.html}, note=[Accessed: 01-May-2026]}