RDFBlankNode
RDFBlankNode["id"]
represents a blank node with identifier "id" in an RDFStore.
RDFBlankNode[]
represents a blank node which is different from all other nodes.
范例
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Needs["GraphStore`"]A blank node with label "abc":
RDFBlankNode["abc"]Represent the age of the universe:
ex[s_] := URL["http://example.org/" <> s];RDFStore[{
RDFTriple[ex["universe"], ex["age"], RDFBlankNode["a123"]],
RDFTriple[RDFBlankNode["a123"], ex["value"], 13800000000],
RDFTriple[RDFBlankNode["a123"], ex["unit"], ex["years"]]
}]Scope (1)
Needs["GraphStore`"]Create a graph that asserts the existence of persons with a particular age and name:
foaf[s_] := URL["http://xmlns.com/foaf/0.1/" <> s];
ex[s_] := URL["http://example.org/" <> s];personStore = RDFStore[{
RDFTriple[RDFBlankNode["a"], foaf["firstName"], "Rosalie"],
RDFTriple[RDFBlankNode["a"], ex["age"], 39],
RDFTriple[RDFBlankNode["b"], foaf["firstName"], "Wolfgang"],
RDFTriple[RDFBlankNode["b"], ex["age"], 67]
}];Query names and corresponding ages:
personStore//SPARQLSelect[{
RDFTriple[SPARQLVariable["person"], foaf["firstName"], SPARQLVariable["name"]],
RDFTriple[SPARQLVariable["person"], ex["age"], SPARQLVariable["age"]]
} -> {"name", "age"}]文本
Wolfram Research (2019)，RDFBlankNode，Wolfram 语言函数，https://reference.wolfram.com/language/GraphStore/ref/RDFBlankNode.html.
CMS
Wolfram 语言. 2019. "RDFBlankNode." Wolfram 语言与系统参考资料中心. Wolfram Research. https://reference.wolfram.com/language/GraphStore/ref/RDFBlankNode.html.
APA
Wolfram 语言. (2019). RDFBlankNode. Wolfram 语言与系统参考资料中心. 追溯自 https://reference.wolfram.com/language/GraphStore/ref/RDFBlankNode.html 年