在Jena上使用OPTION(TRANSITIVE)进行SPARQL查询错误

Question

我有以下查询

PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
SELECT ?type
WHERE
{
   {
      SELECT *
      WHERE
      {
           ?x rdfs:subClassOf ?type .
      }
   }
   OPTION (TRANSITIVE, t_distinct, t_in (?x), t_out (?type) ) .
   FILTER (?x = <http://dbpedia.org/ontology/Hospital>)
}

当我将它发送到Virtuoso端点但它在我的Jena实例上不起作用时它工作正常.具体我得到以下错误:

INFO  [1] 400 Parse error: 
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
SELECT ?type
WHERE
{
   {
      SELECT *
      WHERE
      {
           ?x rdfs:subClassOf ?type .
      }
   }
   OPTION (TRANSITIVE, t_distinct, t_in (?x), t_out (?type) ) .
   FILTER (?x = <http://dbpedia.org/ontology/Hospital>)
}
Lexical error at line 12, column 39.  Encountered: " " (32), after : "OPTION" (17 ms)

如果这是一个Virtuoso特定的功能,我将很高兴知道这个查询的等价物将与*Jena /标准SPARQL一起使用.预期产量应为:

http://dbpedia.org/ontology/Building
http://dbpedia.org/ontology/ArchitecturalStructure
http://dbpedia.org/ontology/Place
http://dbpedia.org/ontology/d0:Location

代表"医院"的所有超类

Answer 1

这是预期的行为.这部分查询:

OPTION (TRANSITIVE, t_distinct, t_in (?x), t_out (?type) ) 

不是标准的SPARQL 1.1,但它是Virtuoso特定的扩展.

Jena是符合SPARQL 1.1的实现.

以下查询使用标准SPARQL 1.1语法执行相同的操作,并且应该与Fuseki和Virtuoso一起使用(仅在dbpedia端点上测试并获得相同的结果):

PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
SELECT ?type
WHERE
{
  {
   SELECT *
   WHERE
    {
       ?x rdfs:subClassOf+ ?type .
    }
  }
  FILTER (?x = <http://dbpedia.org/ontology/Hospital>)
}

使用的功能是"属性路径".

见http://www.w3.org/TR/sparql11-query/