处理数值数据类型时,我遇到了SPARQL问题.
我有一个本体论(http://cabas.ugr.es/ontology/ugr),其中我定义了一对属性,代表了特定性别的学生人数:
<http://cabas.ugr.es/ontology/ugr#hombres>
a owl:DatatypeProperty, owl:FunctionalProperty, rdf:Property ;
rdfs:label
"hombres"@es,
"men"@en ;
rdfs:comment
"Número de estudiantes hombres."@es,
"Number of male students."@en ;
rdfs:range xsd:nonNegativeInteger ;
rdfs:isDefinedBy <http://cabas.ugr.es/ontology/ugr#> ;
owl:sameAs <http://cabas.ugr.es/ontology/ugr#hombres> ;
owl:inverseOf <http://cabas.ugr.es/ontology/ugr#mujeres> ;
ns1:term_status "stable" .
<http://cabas.ugr.es/ontology/ugr#mujeres>
a owl:DatatypeProperty, owl:FunctionalProperty, rdf:Property ;
rdfs:label
"mujeres"@es,
"women"@en ;
rdfs:comment
"Número de estudiantes mujeres."@es,
"Number of female students."@en ;
rdfs:range xsd:nonNegativeInteger ;
rdfs:isDefinedBy <http://cabas.ugr.es/ontology/ugr#> ;
owl:sameAs <http://cabas.ugr.es/ontology/ugr#mujeres> ;
owl:inverseOf <http://cabas.ugr.es/ontology/ugr#hombres> ;
ns1:term_status "stable" .
我在Virtuoso(http://cabas.ugr.es:8890/sparql)上安装了一个SPARQL端点,我在其中输入以下查询:
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> …