JENA 推理

規則：

[transitiveRule: (?A demo:p ?B), (?B demo:p ?C) -> (?A demo:p ?C) ] [symmetricRule: (?Y demo:p ?X) -> (?X demo:p ?Y) ]

數據:

@prefix : <http://jena.hpl.hp.com/demo#> . @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> . @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> . @prefix demo: <http://jena.hpl.hp.com/demo#> .demo:c demo:p demo:a .demo:b demo:p demo:d .demo:a demo:p demo:b .

進行推理：

package iie.ac.jenaTest;import org.apache.jena.rdf.model.InfModel; import org.apache.jena.rdf.model.Model; import org.apache.jena.rdf.model.ModelFactory; import org.apache.jena.rdf.model.Property; import org.apache.jena.rdf.model.RDFNode; import org.apache.jena.rdf.model.Resource; import org.apache.jena.rdf.model.StmtIterator; import org.apache.jena.reasoner.Reasoner; import org.apache.jena.reasoner.rulesys.GenericRuleReasonerFactory; import org.apache.jena.util.FileManager; import org.apache.jena.util.PrintUtil; import org.apache.jena.vocabulary.ReasonerVocabulary;public class ReasonerRuleTest {public static void main(String[] args) {// Register a namespace for use in the demoString demoURI = "http://jena.hpl.hp.com/demo#";PrintUtil.registerPrefix("demo", demoURI);// Create an (RDF) specification of a hybrid reasoner which// loads its data from an external file.Model m = ModelFactory.createDefaultModel();Resource configuration = m.createResource();configuration.addProperty(ReasonerVocabulary.PROPruleMode, "hybrid");configuration.addProperty(ReasonerVocabulary.PROPruleSet, "data/demo.rules");// Create an instance of such a reasonerReasoner reasoner = GenericRuleReasonerFactory.theInstance().create(configuration);// Load test dataModel data = FileManager.get().loadModel("file:data/demoData.ttl");InfModel infmodel = ModelFactory.createInfModel(reasoner, data);// Query for all things related to "a" by "p"Property p = data.getProperty(demoURI, "p");Resource a = data.getResource(demoURI + "a");StmtIterator i = infmodel.listStatements(a , p, (RDFNode)null);while (i.hasNext()) {System.out.println(" - " + PrintUtil.print(i.nextStatement()));//Statement s = i.nextStatement();//System.out.println("<"+s.getSubject()+"> <" + s.getPredicate() + "> <" + s.getObject() + "> .");}} }

輸出結果為：

(demo:a demo:p demo:d) (demo:a demo:p demo:a) (demo:a demo:p demo:c) (demo:a demo:p demo:b)

github：https://github.com/vincentduan/RDF-JENA/tree/master/JenaInference

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