Question

我没有正确的句子问这个问题。我想用样本数据来解释我的问题。

假设三元组如下。

@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix xs: <http://www.w3.org/2001/XMLSchema#> .
@prefix p0: <http://www.mlacustom.com#> .
@prefix p2: <http://www.mla.com/term/> .
_:bnode7021016689601753065 p0:lastModifiedDateTime "2018-09-14T12:55:38"^^<xsd:dateTime> ;
                           p0:lastModifiedUser "admin"^^xs:string .
<http://www.mla.com/name/4204078359> p0:hasClassingFacet "http://www.mla.com/facet/RA"^^xs:string ;
                                     p0:type "Normal"^^xs:string ;
                                     p0:classification _:bnode3452184423513029143 ,
                                                       _:bnode6827572371999795686 ;
                                     p0:recordType "Name"^^xs:string ;
                                     p0:recordNumber "4204078359"^^xs:string ;
                                     p0:stdDescriptor "classification111111"^^xs:string ;
                                     p0:establishedBy "admin"^^xs:string ;
                                     skos:prefLabel "classification111111"^^xs:string ;
                                     p0:createdBy "admin"^^xs:string ;
                                     a skos:Concept ;
                                     p0:createdDate "2018-09-14T12:55:38"^^<xsd:dateTime> ;
                                     p0:establishedDate "2018-09-14T12:55:38"^^<xsd:dateTime> ;
                                     p0:hasRAsubFacet "http://www.mla.com/subfacet/classing-subject-authors"^^xs:string ;
                                     p0:lastModifiedDate "2018-09-14T12:55:38"^^<xsd:dateTime> ;
                                     p0:lastModifiedDetails _:bnode7021016689601753065 ;
                                     p0:isProblematic "N,N"^^xs:string ;
                                     p0:lastModifiedBy "admin"^^xs:string ;
                                     p0:status "established"^^xs:string .
_:bnode3452184423513029143 p0:literature p2:1513 ;
                           p0:timePeriod p2:1005 ;
                           p0:language p2:3199 .
_:bnode6827572371999795686 p0:literature p2:11307 ;
                           p0:timePeriod p2:1009 ;
                           p0:language p2:31 .

请看一下p0:classification，它有两个空白节点，两个空白节点的三元组都带有p0:literature, p0:timePeriod, p0:language

现在我想在其中编写SPARQL查询

(
   (p0:literature is p2:1513 AND  p0:timePeriod is p2:1005) AND 
   (p0:literature is p2:11307 AND p0:timePeriod is p2:1009)
)

根据上述情况，它应该返回http://www.mla.com/name/4204078359主题

分类可以有任意数量的空白节点。

Answer 1

这是解决方案之一。可以找到许多不同的查询。这是明确的。

SELECT ?s WHERE {
    ?s p0:classification ?o1 .
    ?s p0:classification ?o2 .

    ?o1 p0:literature p2:1513 ;
        p0:timePeriod p2:1005 .

    ?o2 p0:literature p2:11307 ;
        p0:timePeriod p2:1009 .
}

sparql和多个谓词组中的查询

1 个答案: