SPARQL

Question

我有一个模型，我有 3 个类:

SR - <http://data.sample.com/vocab/StudentRecord>
HCVR - <http://data.sample.com/vocab/HealthCenterVisitRecord>
CR - <http://data.sample.com/vocab/ClassRoom>

StudentRecord 有一个属性 classRoom.

HealthCenterVisitRecord 有一个属性 studentRecord.

给定一个特定的 ClassRoom URI，我如何找到所有 StudentRecords，它们是 HealthCenterVisitRecords 的属性。

我试过的查询（查询的初始部分获取属于 ClassRoom 的学生，但第二部分搞砸了，我知道）：

SELECT ?hcvr
WHERE {
  ?sr rdf:type <http://data.sample.com/vocab/StudentRecord>.
  ?sr <http://data.sample.com/vocab/classRoom> <http://data.sample.com/resource/ClassRoom/1156>.
  ?sr <http://data.sample.com/vocab/healthCentreVisitRecord> ?hcvr.
}

我试过的另一个查询：

SELECT DISTINCT ?sr WHERE {
  {
  ?sr rdf:type <http://data.sample.com/vocab/StudentRecord>.
  ?sr <http://data.latize.com/vocab/classRoom> <http://data.latize.com/resource/ClassRoom/1156>.
  }
UNION
  { 
        ?hcvr rdf:type <http://data.sample.com/vocab/HealthCentreVisitRecord>.
        ?hcvr <http://data.sample.com/vocab/studentRecord> ?sr.
    }
}
LIMIT 1000

Answer 1

想通了，这里是查询：

SELECT ?hcvr
WHERE {
  ?sr rdf:type <http://data.sample.com/vocab/StudentRecord>.
  ?sr <http://data.sample.com/vocab/classRoom> <http://data.sample.com/resource/ClassRoom/1156>.
  ?hcvr rdf:type <http://data.sample.com/vocab/healthCentreVisitRecord>.
  ?hcvr <http://data.sample.com/vocab/studentRecord> ?sr.
}

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