使用以下示例三元组:
@prefix : <http://www.me.org/me_schema#> .
@prefix dc: <http://purl.org/dc#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
<http://www.me.org/content/me_schema>
rdf:type owl:Ontology ;
owl:imports <http://www.w3.org/2004/02/skos/core> ;
.
:a
rdf:type owl:ObjectProperty ;
rdfs:label "A" ;
rdfs:subPropertyOf :b ;
.
:b
rdf:type owl:ObjectProperty ;
rdfs:label "B" ;
rdfs:subPropertyOf :c ;
.
:c
rdfs:label "C"^^xsd:string ;
.
此查询按预期返回两行(列和?中的b和c):
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
select *
from <test>
where
{
?s rdfs:label 'A' .
?s rdfs:subPropertyOf+ ?o
}
但是,我希望以下内容返回1行但返回空结果。在查询控制台中测试:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
select *
from <test>
where
{
?s rdfs:label 'A' .
?s rdfs:subPropertyOf+ <http://www.me.org/me_schema#c>
}
我希望它为&#34; a&#34;返回一行。这是一个错误还是我错过了一些明显的东西?
我尝试使用DBPedia进行类似的查询,它似乎按照我的预期返回数据。例如,以下查询返回&#34; star&#34;的两行。虽然两者都不是直接的subClassOf owl:Thing。
select *
where
{
?s rdfs:label "star"@en .
?s rdfs:subClassOf+ owl:Thing
} LIMIT 100
如果有人遇到同样的问题,我想出了以下工作:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
select *
from <test>
where
{
?s rdfs:label 'A' .
?s rdfs:subPropertyOf ?s2 .
?s2 rdfs:subPropertyOf* <http://www.me.org/me_schema#c>
}
答案 0 :(得分:7)
(我会在评论中加以说明,但我没有这样的声誉。)
我刚刚在MarkLogic 8.0-3上尝试过你的null结果示例,我确实得到[{"s":"<http://www.me.org/me_schema#a>"}]
,正如你所期望的那样。您使用的是早期版本的MarkLogic(您可以在localhost:8001
的左上角看到该版本)吗?
为了验证这一点,我转到localhost:8000/qconsole/
PREFIX : <http://www.me.org/me_schema#>
prefix dc: <http://purl.org/dc#>
prefix owl: <http://www.w3.org/2002/07/owl#>
prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>
prefix skos: <http://www.w3.org/2004/02/skos/core#>
prefix xsd: <http://www.w3.org/2001/XMLSchema#>
INSERT DATA { GRAPH <test> {
<http://www.me.org/content/me_schema> rdf:type owl:Ontology .
<http://www.me.org/content/me_schema> owl:imports <http://www.w3.org/2004/02/skos/core> .
:a rdf:type owl:ObjectProperty .
:a rdfs:label "A" .
:a rdfs:subPropertyOf :b .
:b rdf:type owl:ObjectProperty .
:b rdfs:label "B" .
:b rdfs:subPropertyOf :c .
:c rdfs:label "C"^^xsd:string .
}}
,设置了内容来源&#39;到我的数据库(打开三重索引)将查询类型更改为&#39; SPARQL更新&#39;,并输入此SPARQL插入代码:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
select *
from <test>
where
{
?s rdfs:label 'A' .
?s rdfs:subPropertyOf+ <http://www.me.org/me_schema#c>
}
然后我在查询控制台中打开了一个新选项卡,将查询类型设置为&#34; SPARQL查询&#34;,并运行您的确切查询:
#hideme{display:none;}
.menu ul {
padding:0;
margin:0;
color:white;
text-decoration:none;
}
.menu li {
box-sizing:border-box;
padding:0;
margin:0;
list-style:none;
color:white;
text-decoration: none;
text-align: bottom; vertical-align: bottom;
}
.menu > li ul li{
box-sizing:border-box;
margin-left:20px;
margin-top:5px;
list-style:none;
text-decoration: none;
text-align: bottom; vertical-align: bottom;
}
ul.menu > li {
overflow:hidden;
width:90px;
min-height:90px;
max-height:90px;
padding:10px;
margin-bottom:10px;
background:#5DB26E;
color:#5DB26E;
cursor:pointer;
transition:all 0s ease;
}
ul.menu > li:hover {
width:180px;
min-height:180px;
color: white;
border: 3px solid white;
box-shadow: 0px 0px 0px 3px #5DB26E;
position: relative;
}
ul.menu> li:hover #hideme{display:block; position: absolute;
bottom: 10;}
ul.menu> li:hover .fa-arrow-right{content: "\f023";}
.hoverme:hover .fa-arrow-right,
.hoverme .fa-check {
display: none;
}
.hoverme:hover .fa-check {
display: inline;
}
.menu a {
margin:0;
text-decoration:none;
color:white;
}
如果您使用的是早期版本的MarkLogic,请尝试更新MarkLogic query console上的最新版本。