DBpedia使用sparql获取页面类别 [英] DBpedia getting page category using sparql

问题描述

我正在使用DBpedia在R中使用SPARQL获取页面类别。但是，它存在一些问题。我正在使用的源代码：

I am using DBpedia to getting page category using SPARQL in R. However, there are having some problems on it. Source code I am using:

PREFIX dcterms: <http://purl.org/dc/terms/>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>  
SELECT ?categoryUri ?categoryName WHERE {
    <http://dbpedia.org/resource/xxx> dcterms:subject ?categoryUri.
         ## xxx are random words (e.g. Agree, Film, Work, Plan...)
    ?categoryUri rdfs:label ?categoryName.
    FILTER (lang(?categoryName) = "en")
}

问题是：

1. 如果单词需要重定向（例如，同意->协议），则无法检索类别

1. Category cannot be retrieved if the words need to be redirected (e.g. Agree -> Agreement)

上面的源代码无法使用歧义页面，因为单词类别（例如工作）中有很多子页面

Disambiguation pages cannot be used from the above source code, because there are so many sub-pages within the category of word (e.g. Work)

那么，如何解决以上问题？如果有人可以提供帮助，我将非常感激！！！

So, how can I resolve the above problems? I am really appreciate if anyone can offer your help!!!

推荐答案

SPARQL只会执行您编写的内容，所以没有魔术。如果某些资源：s 可能通过属性：p 连接到其他资源，则添加三元模式：s：p？o。-有时您甚至可能考虑使用属性路径，以解决：p ，即：s：p *？o。。

SPARQL does only do what you write, so there is no magic behind. If some resource :s is possibly connected to others by a property :p, add a triple pattern :s :p ?o . - sometimes you might even consider to use a property path in case of the resolution of the transitive closure of :p, i.e. :s :p* ?o ..

已解决重定向：

PREFIX  dbo:  <http://dbpedia.org/ontology/>
PREFIX  dcterms: <http://purl.org/dc/terms/>

SELECT * WHERE
  { <http://dbpedia.org/resource/Agree> (dbo:wikiPageRedirects)* ?page
    OPTIONAL
      { ?page dcterms:subject ?categoryUri}
  }

请注意 OPTIONAL 子句，这在这里是必需的，因为并非DBpedia中的所有资源都属于一个类别。

Note the OPTIONAL clause, which is necessary here because not all resources in DBpedia belong to a category.

包括歧义页面：

PREFIX  dbo:  <http://dbpedia.org/ontology/>
PREFIX  dcterms: <http://purl.org/dc/terms/>

SELECT * WHERE
  { <http://dbpedia.org/resource/Agree> (dbo:wikiPageRedirects)*/(dbo:wikiPageDisambiguates)* ?page
    OPTIONAL
      { ?page dcterms:subject ?categoryUri}
  }

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