使用sparql查询计算OWL文件中的特定关系

Question

我想计算OWL文件中特定关系的断言。 如果以下是我的整个本体论： -

<owl:NamedIndividual rdf:about="file:/C:/myOnt.owl#comfort">
  <SynonymOf rdf:resource="file:/C:/myOnt.owl#impunity"/>
  <SynonymOf rdf:resource="file:/C:/myOnt.owl#sooth"/>
  <SynonymOf rdf:resource="file:/C:/myOnt.owl#ease"/>
</owl:NamedIndividual>

<owl:NamedIndividual rdf:about="file:/C:/myOnt.owl#population">
  <SynonymOf rdf:resource="file:/C:/myOnt.owl#habitation"/>
</owl:NamedIndividual>

那么sparql查询应该给我这样的东西： -

       SynonymOf = 4 (i.e 4 assertions for <SynonymOf> relation

我打算在jena fuzeki上运行查询。

Answer 1

一种直截了当的方式是：

PREFIX : <http://example.com#>
SELECT (count(?o) as ?count)
WHERE {
  ?s :SynonymOf ?o
} 

但是，对于要分配给特定对象的绑定，您可能需要考虑使用Group By ：

PREFIX : <http://example.com#>
SELECT ?s (count(?o) as ?count)
WHERE {
  ?s :SynonymOf ?o
}
GROUP BY ?s

Answer 2

SELECT (COUNT(?s) as ?SynonymOf)
WHERE {
    GRAPH ?g {?s SynonymOf ?o }
    }