我对 SPARQL 很陌生,所以请多多包涵。我正在使用 Apache Jena 将我的 RDF 存储在不同的命名图中,我有这些 RDF 命名图:
端点名称:http://localhost:3030/2012-2013/query
命名图:
<http://localhost:3030/2012-2013/data/2012-2013_62DAYBYCANCER>
<http://localhost:3030/2012-2013/data/2012-2013_62_DAY_CANCER_PLAN_ALL_CANCER>
<http://localhost:3030/2012-2013/data/2012-2013_62_DAY_CRS_SCEENING>
在另一个端点我有这些命名图:
端点名称:
http://localhost:3030/2013-2014/query
命名图:
<http://localhost:3030/2013-2014/data/2013-2014_62DAYBYCANCER>
<http://localhost:3030/2013-2014/data/2013-2014_62_DAY_CANCER_PLAN_ALL_CANCER>
<http://localhost:3030/2013-2014/data/2013-2014_62_DAY_CRS_SCEENING>
我想访问图中的三元组2012-2013_62DAYBYCANCER
并将它们加入到三元组中2013-2014_62DAYBYCANCER
。是否可以同时使用命名图和服务?
图表的结构如下所示。我想和他们provider
一起period-type
获得total
.
对于图2012-2013_62DAYBYCANCER
,结构是:
<rdf:Description rdf:about="http://mastersrdf.org/dataset/2012_2013_62DAYBYCANCER/1">
<qb:dataSet rdf:resource="http://mastersrdf.org/dataset/2012_2013_62DAYBYCANCER"/>
<provider xmlns="http://mastersrdf.org/def/statistical-dimension/" rdf:resource="http://mastersrdf.org/hull-and-east-yorkshire-hospitals-nhs-trust"/>
<total xmlns="http://mastersrdf.org/def/statistical-dimension/">4</total>
<period-type xmlns="http://mastersrdf.org/def/statistical-dimension/" rdf:resource="http://mastersrdf.org/q1"/>
</rdf:Description>
对于图2013-2014_62DAYBYCANCER
,结构是:
<rdf:Description rdf:about="http://mastersrdf.org/dataset/2013_2014_62DAYBYCANCER/1">
<qb:dataSet rdf:resource="http://mastersrdf.org/dataset/2013_2014_62DAYBYCANCER"/>
<provider xmlns="http://mastersrdf.org/def/statistical-dimension/" rdf:resource="http://mastersrdf.org/hull-and-east-yorkshire-hospitals-nhs-trust"/>
<total xmlns="http://mastersrdf.org/def/statistical-dimension/">50</total>
<period-type xmlns="http://mastersrdf.org/def/statistical-dimension/" rdf:resource="http://mastersrdf.org/q1"/>
</rdf:Description>