如何在Jena TDB中使用Openllet OWL2推理程序(或其他任何方法)?

时间:2018-08-09 09:59:17

标签: java jena semantic-web ontology pellet

我已经找到了一种使用Openllet推理程序和Jena TDB来推断三元组存储内容的方法,但它似乎并不是最佳方法。这是我的解决方案:

Reasoner reasoner = PelletReasonerFactory.theInstance().create();
InfModel infModel = ModelFactory
                        .createInfModel(reasoner, dataset.getNamedModel(KD.URI));

/*
 * To extract the model, a transaction must be open in READ mode.
 */

dataset.begin(ReadWrite.READ);

ModelExtractor me = new ModelExtractor(infModel);

dataset.end();

/*
 * To replace a currently existing named model within the dataset, a transaction must be open in WRITE mode.
 */

dataset.begin(ReadWrite.WRITE);
dataset.replaceNamedModel(KD.URI, me.extractModel());
dataset.commit();
dataset.end();

这可行,但是我想知道一种比在数据集中实际替换命名模型更优雅的方法。在理想情况下,我还希望推理是连续的(一旦在图表上自动插入了三元组,就可以自动推断出该数据),但是我不知道是否可能。

1 个答案:

答案 0 :(得分:2)

对于连续推理过程,您需要设置Fuseki配置。

这是我使用Openllet推理程序在持久性TDB数据库上进行配置的快速示例。

@prefix :      <http://base/#> . @prefix tdb:  
<http://jena.hpl.hp.com/2008/tdb#> . @prefix rdf:  
<http://www.w3.org/1999/02/22-rdf-syntax-ns#> . @prefix ja:   
<http://jena.hpl.hp.com/2005/11/Assembler#> . @prefix rdfs: 
<http://www.w3.org/2000/01/rdf-schema#> . @prefix fuseki:
<http://jena.apache.org/fuseki#> .

:service_tdb_all  a                   fuseki:Service ;
        rdfs:label                    "LABEL_OF_YOUR_SERVICE" ;
        fuseki:dataset                :dataset ;
        fuseki:name                   "NAME_OF_YOUR_SERVICE" ;
        fuseki:serviceQuery           "query" , "sparql" ;
        fuseki:serviceReadGraphStore  "get" ;
        fuseki:serviceReadWriteGraphStore
                "data" ;
        fuseki:serviceUpdate          "update" ;
        fuseki:serviceUpload          "upload" .

:dataset a ja:RDFDataset ;
  ja:defaultGraph <#modeInf>; .

<#modeInf> a ja:InfModel;
  ja:baseModel <#tdbGraph>;
  ja:reasoner   [
    ja:reasonerClass    "openllet.jena.PelletReasonerFactory" ]
  .  

<#tdbGraph> rdf:type tdb:GraphTDB ;
  tdb:dataset :tdb_dataset_readwrite  .

:tdb_dataset_readwrite  a            
  tdb:DatasetTDB ;  tdb:location 
  "PATH_TO_YOUR_TDB"
  .