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SPARQLOptional[patt]

represents part of a pattern that does not need to match in order for the whole pattern to match.

更多信息和选项
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范例  
基本范例  
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按以下格式引用：
GraphStore`
GraphStore`

SPARQLOptional

SPARQLOptional[patt]

represents part of a pattern that does not need to match in order for the whole pattern to match.

更多信息和选项

  • In SPARQLOptional[patt], patt can take the same form as in SPARQLSelect[patt].

范例

基本范例  (1)

Data about fruits:

Find the color and optionally the shape of fruits:

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

文本

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

CMS

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

APA

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

BibTeX

@misc{reference.wolfram_2025_sparqloptional, author="Wolfram Research", title="{SPARQLOptional}", year="2019", howpublished="\url{https://reference.wolfram.com/language/GraphStore/ref/SPARQLOptional.html}", note=[Accessed: 30-April-2026]}

BibLaTeX

@online{reference.wolfram_2025_sparqloptional, organization={Wolfram Research}, title={SPARQLOptional}, year={2019}, url={https://reference.wolfram.com/language/GraphStore/ref/SPARQLOptional.html}, note=[Accessed: 30-April-2026]}