通过DBO查询Dbpedia-SPARQL

问题描述

我正在尝试提取此dbpedia页面 http://dbpedia.org/page/Diageo 的制造商部分。但是我的SPARQL查询什么也不返回。但是我可以返回页面上的其他大多数值，例如布局完全相同的keyPersons。

I am trying to extract the manufacturer section of this dbpedia page http://dbpedia.org/page/Diageo. However my SPARQL query returns nothing. Yet I can return most other values on the page, such as keyPersons which has the exact same layout.

PREFIX dbpedia-owl: <http://dbpedia.org/ontology/>
SELECT ?label
WHERE { <http://dbpedia.org/resource/Diageo>
        dbpedia-owl:keyPerson ?label }

---

---

PREFIX dbpedia-owl: <http://dbpedia.org/ontology/>
SELECT ?label
WHERE { <http://dbpedia.org/resource/Diageo>
        dbpedia-owl:manufacturer ?label }

有什么想法吗？

推荐答案

在DBpedia中，实体页面显示的语句中，实体不仅可以是主体，而且可以是对象。在后一种情况下，相应的属性显示为 是...的。

In DBpedia, an entity page displays statements in which an entity may be not only a subject, but also an object. In the latter case, respective property appears as "is ... of".

相反，您链接的表示 dbr：Diageo 是 dbo：manufacturer of > dbr：Johnnie_Walker 等。这意味着 dbr：Johnnie_Walker dbo：manufacturer dbr：Diageo 成立，而不是 dbr：Diageo dbo：manufacturer dbr：Johnnie_Walker 确实。

Conversely, the page you have linked to says that dbr:Diageo is dbo:manufacturer of dbr:Johnnie_Walker etc. This means that dbr:Johnnie_Walker dbo:manufacturer dbr:Diageo holds, not that dbr:Diageo dbo:manufacturer dbr:Johnnie_Walker does.

顺便说一下， rdfs：range 的 dbo：manufacturer dbo：Organization 。

因此，您应该寻找与反向模式匹配的三元组：

Thus, you should looking for triples that match reversed pattern:

SELECT * WHERE { ?variable dbo:manufacturer ?dbr:Diageo . }

或者，使用：

SELECT * WHERE { dbr:Diageo ^dbo:manufacturer ?variable . }

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