如何查询给定维基百科URL的DBPedia数据？ [英] How to query DBPedia data for a given Wikipedia URL?

问题描述

如果我想在RDF中查询 Appomattox法院大楼国家历史公园 http://live.dbpedia.org/sparql rel = nofollow> DBPedia ，如果我通过Wiki页面URL搜索，查询字符串是什么？

If I want to query the RDF for Appomattox Court House National Historical Park in DBPedia, what's the query string if I search by wiki page URL?

我测试了以下字符串，但未得到结果：

I tested the following string but get no result:

select ?building 
where {
   ?building a dbo:Building .
   ?building foaf:primaryTopic <http://en.wikipedia.org/wiki/Appomattox_Court_House_National_Historical_Park>
} LIMIT 100

推荐答案

还要评论：问题是您使用 foaf：primaryTopic 关系是错误的方法。 Wiki页面是该关系的 subject ，而DBPedia资源则是对象值。因此应该是这样：

As said in my comment as well: the problem is that you are using the foaf:primaryTopic relation the wrong way around. The wiki page is the subject of the relation, and the DBPedia resource the object value. So it should be this:

SELECT ?building 
WHERE {
    ?building a dbo:Building .
    <http://en.wikipedia.org/wiki/Appomattox_Court_House_National_Historical_Park> foaf:primaryTopic ?building .
} 
LIMIT 100

或者，如@AKSW所评论，您可以使用逆关系，称为 foaf：isPrimaryTopicOf ：

Alternatively, as @AKSW commented, you can use the inverse relation, which is called foaf:isPrimaryTopicOf:

SELECT ?building 
WHERE {
    ?building a dbo:Building .
    ?building foaf:isPrimaryTopicOf <http://en.wikipedia.org/wiki/Appomattox_Court_House_National_Historical_Park> .
} 
LIMIT 100

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