以下代码实现的具体功能为:
读入三个不同但相关联的本体,设定1个关键词(此关键词在某本体内为类名,在另一本体内为实体名),查询出跟这关键词相关的总共三个本体内的内容.
希望此代码能帮助初学者了解Jena下使用SPARQL实现本体的查询,以此举一反三.同时也欢迎交流与指错.
(注意:勿忘运行前设好Jena的classpath)
import com.hp.hpl.jena.query.*;
import com.hp.hpl.jena.rdf.model.*;
import com.hp.hpl.jena.query.Query;
import com.hp.hpl.jena.query.ResultSet;
import com.hp.hpl.jena.ontology.*;
import com.hp.hpl.jena.reasoner.*;
public class MyOntology{
public static void main(String[] args) {
OntModel text_ontmodel = ModelFactory.createOntologyModel();
OntDocumentManager dm = text_ontmodel.getDocumentManager();
dm.addAltEntry("
http://www.owl-ontologies.com/Ontology1241779535.owl#","file:" + "Family.owl");
text_ontmodel.read("file:C:/Protege_3.4/Family.owl");
String k=" base:Julia ";
String prefix = "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 base:<
http://www.owl-ontologies.com/Ontology1241779535.owl#> ";
String slect = "SELECT ?son ?daughter ?father ?mother ?sister ?brother ?marry_with ";
String where = "WHERE { "+
"OPTIONAL { "+ k +
" base:son ?son ."+
" }"+
"OPTIONAL { "+ k +
" base:daughter ?daughter ."+
//for <daughter xml:lang="en">Lily</daughter> in <married rdf:ID="Julia">
" }"+
"OPTIONAL { "+ k +
" base:father ?father ."+
" }"+
"OPTIONAL { "+ k +
" base:mother ?mother ."+
" }"+
"OPTIONAL { "+ k +
" base:sister ?sister ."+
" }"+
"OPTIONAL { "+ k +
" base:brother ?brother ."+
" }"+
"OPTIONAL { "+ k +
" base:marry_with ?marry_with ."+
" }"+
//can test "?x rdfs:subClassOf ?y ." +
//and "?y base:son \"Jack\"@en ."+
" }";
Query query = QueryFactory.create(prefix + slect + where);
Reasoner reasoner = ReasonerRegistry.getOWLReasoner();
InfModel inf = ModelFactory.createInfModel(reasoner, text_ontmodel);
QueryExecution qe = QueryExecutionFactory.create(query,inf);
ResultSet results = qe.execSelect();
ResultSetFormatter.out(System.out,results,query);
qe.close();
OntModel text_ontmodel2 = ModelFactory.createOntologyModel();
OntDocumentManager dm2 = text_ontmodel.getDocumentManager();
dm2.addAltEntry("
http://www.owl-ontologies.com/Ontology1241779535.owl#","file:" + "Family2.owl");
text_ontmodel2.read("file:C:/Protege_3.4/Family2.owl");
String prefix2 = "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 base:<
http://www.owl-ontologies.com/Ontology1241779535.owl#> ";
String slect2 = "SELECT ?relationship ?with ";
String where2 = "WHERE { "+
"?x owl:onProperty ?relationship ." +
//here for <owl:ObjectProperty rdf:ID="daughter_is"/> in <owl:onProperty> in <owl:Restriction> in <owl:Class rdf:ID="Julia">
"?x owl:allValuesFrom ?with ."+ k +
" rdfs:subClassOf ?x ."+
" }";
Query query2 = QueryFactory.create(prefix2 + slect2 + where2);
Reasoner reasoner2 = ReasonerRegistry.getOWLReasoner();
InfModel inf2 = ModelFactory.createInfModel(reasoner2, text_ontmodel2);
QueryExecution qe2 = QueryExecutionFactory.create(query2,inf2);
ResultSet results2 = qe2.execSelect();
ResultSetFormatter.out(System.out,results2,query2);
qe2.close();
OntModel text_ontmodel3 = ModelFactory.createOntologyModel();
OntDocumentManager dm3 = text_ontmodel3.getDocumentManager();
dm3.addAltEntry("http://www.owl-ontologies.com/Ontology1241772983.owl#","file:" + "human_being.owl");
text_ontmodel3.read("file:C:/Protege_3.4/human_being.owl");
String prefix3 = "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 base:<http://www.owl-ontologies.com/Ontology1241772983.owl#> ";
String slect3 = "SELECT ?birthday ?firstname ?familyname ?nationality ";
String where3 = "WHERE { "+
"OPTIONAL { "+ k +
" base:birthday ?birthday ."+
" }"+
"OPTIONAL { "+ k +
" base:firstname ?firstname ."+
" }"+
"OPTIONAL { "+ k +
" base:familyname ?familyname ."+
" }"+
"OPTIONAL { "+ k +
" base:nationality ?nationality ."+
" }"+
" }";
Query query3 = QueryFactory.create(prefix3 + slect3 + where3);
Reasoner reasoner3 = ReasonerRegistry.getOWLReasoner();
InfModel inf3 = ModelFactory.createInfModel(reasoner3, text_ontmodel3);
QueryExecution qe3 = QueryExecutionFactory.create(query3,inf3);
ResultSet results3 = qe3.execSelect();
ResultSetFormatter.out(System.out,results3,query3);
qe3.close();
}
}
附件里面有本代码应用到的三个本体owl文件,另外还有4个关系图帮助理解三本体,其中Ktiiy应为Kitty
此主题相关图片如下：
此主题相关图片如下：
此主题相关图片如下：
此主题相关图片如下：
[此贴子已经被作者于2009-5-19 14:23:05编辑过]
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2009/5/19 4:23:00
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[原创]Jena下本体的简单检索
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