GraphStore`
GraphStore`

SPARQLFilter

SPARQLFilter[expr]

represents a filter in a SPARQL graph pattern.

Details

  • A filter can appear anywhere inside a list of SPARQL patterns.
  • A list of SPARQL patterns is known as a group graph pattern.
  • expr typically contains SPARQLVariable objects.
  • expr typically is an expression that evaluates to a Boolean. Examples include SPARQLVariable["x"]>5 and SPARQLEvaluation["strstarts"][SPARQLVariable["title"],"A"].
  • A group graph pattern {patt1,,SPARQLFilter[expr],} matches a list of triples if all the patterns patti match and values for variables from those matches, when substituted into the expression expr, make the expression evaluate to True.

Examples

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Basic Examples  (1)

Data about books:

Find books published before 1850:

Properties & Relations  (1)

Export a query containing a filter as a SPARQL string:

Wolfram Research (2020), SPARQLFilter, Wolfram Language function, https://reference.wolfram.com/language/GraphStore/ref/SPARQLFilter.html.

Text

Wolfram Research (2020), SPARQLFilter, Wolfram Language function, https://reference.wolfram.com/language/GraphStore/ref/SPARQLFilter.html.

BibTeX

@misc{reference.wolfram_2021_sparqlfilter, author="Wolfram Research", title="{SPARQLFilter}", year="2020", howpublished="\url{https://reference.wolfram.com/language/GraphStore/ref/SPARQLFilter.html}", note=[Accessed: 22-September-2021 ]}

BibLaTeX

@online{reference.wolfram_2021_sparqlfilter, organization={Wolfram Research}, title={SPARQLFilter}, year={2020}, url={https://reference.wolfram.com/language/GraphStore/ref/SPARQLFilter.html}, note=[Accessed: 22-September-2021 ]}

CMS

Wolfram Language. 2020. "SPARQLFilter." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/GraphStore/ref/SPARQLFilter.html.

APA

Wolfram Language. (2020). SPARQLFilter. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/GraphStore/ref/SPARQLFilter.html