我建立一个关于字典的本体，主要有两种单词英语单词（eword）和德语单词（gwoed），实现他们之间的翻译，其中eglish_to_german和german_to_eglish是互逆的定义如下：
<?xml version="1.0"?>
<!DOCTYPE rdf:RDF [
<!ENTITY vin "http://www.w3.org/TR/2003/CR-owl-guide-20030818/wine#" >
<!ENTITY food "http://www.w3.org/TR/2003/CR-owl-guide-20030818/food#" >
<!ENTITY owl "http://www.w3.org/2002/07/owl#" >
<!ENTITY xsd "http://www.w3.org/2001/XMLSchema#" >
]>
<rdf:RDF xmlns="http://www.owl-ontologies.com/di.owl#"
xml:base="http://www.owl-ontologies.com/di.owl"
xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
xmlns:xsd="http://www.w3.org/2001/XMLSchema#"
xmlns:owl="http://www.w3.org/2002/07/owl#"
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
<owl:Ontology rdf:about=""/>
<owl:Class rdf:ID="dictionary"/>
<dictionary rdf:ID="dictionary_new">
<content_of rdf:resource="#Kaffee"/>
<content_of rdf:resource="#Milch"/>
<content_of rdf:resource="#Kuh"/>
<content_of rdf:resource="#Katze"/>
<content_of rdf:resource="#Hund"/>
<content_of rdf:resource="#milk"/>
<content_of rdf:resource="#cat"/>
<content_of rdf:resource="#dog"/>
<content_of rdf:resource="#cow"/>
<content_of rdf:resource="#coffee"/>
</dictionary>
<eword rdf:ID="cat">
</eword>
<eword rdf:ID="coffee">
</eword>
<eword rdf:ID="cow">
</eword>
<eword rdf:ID="dog">
</eword>
<eword rdf:ID="milk">
</eword>
<owl:ObjectProperty rdf:ID="content_of">
<rdfs:domain rdf:resource="#dictionary"/>
<rdfs:range rdf:resource="#word"/>
</owl:ObjectProperty>
<owl:ObjectProperty rdf:ID="eglish_to_german">
<rdfs:domain rdf:resource="#eword"/>
<rdfs:range rdf:resource="#gword"/>
<owl:inverseOf rdf:resource="#german_to_eglish"/>
</owl:ObjectProperty>
<owl:ObjectProperty rdf:ID="german_to_eglish">
<rdf:type rdf:resource="&owl;InverseFunctionalProperty"/>
<rdfs:domain rdf:resource="#gword"/>
<rdfs:range rdf:resource="#eword"/>
<owl:inverseOf rdf:resource="#eglish_to_german"/>
</owl:ObjectProperty>
<owl:Class rdf:ID="eword">
<rdfs:subClassOf rdf:resource="#word"/>
<owl:disjointWith rdf:resource="#gword"/>
</owl:Class>
<owl:Class rdf:ID="gword">
<rdfs:subClassOf rdf:resource="#word"/>
<owl:disjointWith rdf:resource="#eword"/>
</owl:Class>
<gword rdf:ID="Hund">
<german_to_eglish rdf:resource="#dog"/>
</gword>
<gword rdf:ID="Kaffee">
<german_to_eglish rdf:resource="#coffee"/>
</gword>
<gword rdf:ID="Katze">
<german_to_eglish rdf:resource="#cat"/>
</gword>
<gword rdf:ID="Kuh">
<german_to_eglish rdf:resource="#cow"/>
</gword>
<gword rdf:ID="Milch">
<german_to_eglish rdf:resource="#milk"/>
</gword>
<owl:Class rdf:ID="word"/>
</rdf:RDF>
然后处理程序如下：
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import com.hp.hpl.jena.query.*;
import com.hp.hpl.jena.rdf.model.*;
import com.hp.hpl.jena.reasoner.*;
public class T {
public static void main(String[] args) throws FileNotFoundException {
String s="PREFIX dictionary: <http://www.owl-ontologies.com/di.owl#> " +
"SELECT ?x " +
"WHERE { dictionary:Katze dictionary:german_to_eglish ?x }";
Model m=ModelFactory.createDefaultModel();
m.read(new FileInputStream(new File("dictionary.owl")), "");
Reasoner reasoner=ReasonerRegistry.getOWLReasoner();
reasoner.bindSchema(m);
Query query=QueryFactory.create(s);
InfModel infmodel = ModelFactory.createInfModel(reasoner, m);
QueryExecution execution=QueryExecutionFactory.create(s, infmodel);
ResultSet results=execution.execSelect();
ResultSetFormatter.out(System.out, results, query);
}
}
是输出：
------------------
| x |
==================
| dictionary:cat |
------------------
而我把查询语句改为：
String s="PREFIX dictionary: <http://www.owl-ontologies.com/di.owl#> " +
"SELECT ?x " +
"WHERE { dictionary:cat dictionary:english_to_german ?x }";
却输出：
-----
| x |
=====
-----
我想要的结果是：
------------------
| x |
==================
| dictionary:Katze |
------------------
请高手指点迷津！
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2007/6/2 9:47:00
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关于jena查询推理后的内容问题？
