SPARQL查询rdf容器(rdf: Bag) [英] SPARQL query rdf container (rdf: Bag)

问题描述

我有这个 RDF

<?xml version="1.0" encoding="UTF-8"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:com="http://www.example.com/com#">
  <rdf:Description rdf:about="http://www.example.com/com#1">
    <com:cities>
      <rdf:Bag>
        <rdf:li>A</rdf:li>
        <rdf:li>B</rdf:li>
        <rdf:li>D</rdf:li>
      </rdf:Bag>
    </com:cities>
    <com:name>1</com:name>
  </rdf:Description>
  <rdf:Description rdf:about="http://www.example.com/com#2">
    <com:cities>
      <rdf:Bag>
        <rdf:li>C</rdf:li>
        <rdf:li>B</rdf:li>
      </rdf:Bag>
    </com:cities>
    <com:name>2</com:name>
  </rdf:Description>
  <rdf:Description rdf:about="http://www.example.com/com#3">
    <com:cities>
      <rdf:Bag>
        <rdf:li>C</rdf:li>
        <rdf:li>B</rdf:li>
        <rdf:li>D</rdf:li>
      </rdf:Bag>
    </com:cities>
    <com:name>3</com:name>
  </rdf:Description>
</rdf:RDF>

使用 Sparql 我需要获取所有对象的名称，其中包含城市 D(1 和 3).我可以这样做:

Using Sparql I need to get names of all objects, which contains city D (1 and 3). I can do something like this:

SELECT ?name
WHERE {
?a com:cities ?cities.
?cities rdf:_1 ?s.
FILTER(?s = "D")
?a com:name ?name.    
}

但它只会检查第一个元素.我可以使用 rdf:_2, rdf:_3, ... 并使用 UNION 进行更多查询，但我不知道 Bag 中 rdf:li 的数量.有类似 rdf:all 的东西吗?或者其他一些解决方案来做到这一点?谢谢

but it will check only first element. I could make more queries, with rdf:_2, rdf:_3, ... and use UNION, but I don't know number of rdf:li in Bag. Is there something like rdf:all? Or some other solution to do this? Thanks

推荐答案

使用 rdfs:member

?cities rdfs:member ?s.

如果您的系统支持它或过滤属性 URI:

if your system supports it or filter on the property URI:

PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
...
?cities ?prop ?s. FILTER (strstarts(str(?prop), str(rdf:_)))

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