GraphStore`
GraphStore`
SPARQLFilter
SPARQLFilter[expr]
represents a filter in a SPARQL graph pattern.
更多信息和选项
- 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.
范例
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Wolfram Research (2020)，SPARQLFilter，Wolfram 语言函数，https://reference.wolfram.com/language/GraphStore/ref/SPARQLFilter.html.
文本
Wolfram Research (2020)，SPARQLFilter，Wolfram 语言函数，https://reference.wolfram.com/language/GraphStore/ref/SPARQLFilter.html.
CMS
Wolfram 语言. 2020. "SPARQLFilter." Wolfram 语言与系统参考资料中心. Wolfram Research. https://reference.wolfram.com/language/GraphStore/ref/SPARQLFilter.html.
APA
Wolfram 语言. (2020). SPARQLFilter. Wolfram 语言与系统参考资料中心. 追溯自 https://reference.wolfram.com/language/GraphStore/ref/SPARQLFilter.html 年