[英]get Literal using the object property Sparql Jena
我有兩個sparql查詢:
public static String query2
= "PREFIX diag: <file:/D:/onto/owl_ontologies/diagnostic1.owl#> "
+ "PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>"
+ "PREFIX owl:<http://www.w3.org/2002/07/owl#>"
+ "SELECT ?disease ?symptom"
+ "WHERE { ?disease diag:hasSymptom ?symptom}";
String moreSymptomsQuery
= "PREFIX diag: <http://www.hamzadje28/onto/owl_ontologies/diagnostic.owl#> "
+ "SELECT ?symptom"
+ "WHERE {\"hyperglycemia\" diag:hasSymptom ?symptom}";
這是我的OWL文件的一部分
<rdf:RDF
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:owl="http://www.w3.org/2002/07/owl#"
xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
xmlns:xsd="http://www.w3.org/2001/XMLSchema#"
xmlns:diag="http://www.hamzadje28/onto/owl_ontologies/diagnostic.owl#">
<owl:Ontology rdf:about="http://www.hamzadje28/onto/owl_ontologies/diagnostic.owl"/>
<owl:Class rdf:about="http://www.hamzadje28/onto/owl_ontologies/diagnostic.owl#Symptom"/>
<owl:Class rdf:about="http://www.hamzadje28/onto/owl_ontologies/diagnostic.owl#Desease"/>
<owl:ObjectProperty rdf:about="http://www.hamzadje28/onto/owl_ontologies/diagnostic.owl#hasSymptom">
<rdfs:range rdf:resource="http://www.hamzadje28/onto/owl_ontologies/diagnostic.owl#Symptom"/>
<rdfs:domain rdf:resource="http://www.hamzadje28/onto/owl_ontologies/diagnostic.owl#Desease"/>
</owl:ObjectProperty>
<owl:DatatypeProperty rdf:about="http://www.hamzadje28/onto/owl_ontologies/diagnostic.owl#DesId">
<rdfs:range rdf:resource="http://www.w3.org/2001/XMLSchema#string"/>
<rdfs:domain rdf:resource="http://www.hamzadje28/onto/owl_ontologies/diagnostic.owl#Desease"/>
</owl:DatatypeProperty>
<owl:DatatypeProperty rdf:about="http://www.hamzadje28/onto/owl_ontologies/diagnostic.owl#SympId">
<rdfs:range rdf:resource="http://www.w3.org/2001/XMLSchema#string"/>
<rdfs:domain rdf:resource="http://www.hamzadje28/onto/owl_ontologies/diagnostic.owl#Symptom"/>
</owl:DatatypeProperty>
<owl:DatatypeProperty rdf:about="http://www.hamzadje28/onto/owl_ontologies/diagnostic.owl#DesLabel">
<rdfs:range rdf:resource="http://www.w3.org/2001/XMLSchema#string"/>
<rdfs:domain rdf:resource="http://www.hamzadje28/onto/owl_ontologies/diagnostic.owl#Desease"/>
</owl:DatatypeProperty>
<owl:DatatypeProperty rdf:about="http://www.hamzadje28/onto/owl_ontologies/diagnostic.owl#SympLabel">
<rdfs:range rdf:resource="http://www.w3.org/2001/XMLSchema#string"/>
<rdfs:domain rdf:resource="http://www.hamzadje28/onto/owl_ontologies/diagnostic.owl#Symptom"/>
</owl:DatatypeProperty>
<!--this is an individual "desease" hasSymptom "Symptom" -->
<diag:Desease rdf:about="http://www.hamzadje28/onto/owl_ontologies/diagnostic.owl#hyperglycemia">
<diag:hasSymptom>hypergammaglobulinemia</diag:hasSymptom>
<diag:DesId>DES:000004</diag:DesId>
<diag:DesLabel>hyperglycemia</diag:DesLabel>
</diag:Desease>
這是我在耶拿的代碼:
public void SelectQuesry() {
Query query = QueryFactory.create(queryName);
QueryExecution executeQuery = QueryExecutionFactory.create(query, modelDiag);
org.apache.jena.query.ResultSet res = executeQuery.execSelect();
while (res.hasNext()) {
QuerySolution qs = res.nextSolution();
Literal symp = qs.getLiteral("symptom");
System.out.println(symp.toString());
}
}
第一個查詢給出結果,而第二個則沒有結果! 我想知道每種疾病的症狀...這很重要...謝謝您的幫助。
文字絕不是RDF三元組的主題,實際上這意味着三元組模式
"hyperglycemia" diag:hasSymptom ?symptom
您的第二個查詢中沒有任何數據。
您必須使用RDF資源的URI,即http://www.hamzadje28/onto/owl_ontologies/diagnostic.owl#hyperglycemia
,作為三重模式的主題:
PREFIX diag: <http://www.hamzadje28/onto/owl_ontologies/diagnostic.owl#>
SELECT ?symptom
WHERE {
diag:hyperglycemia diag:hasSymptom ?symptom
}
作為評論(我想我上次已經告訴過您):通過使用N-Triples語法而不是RDF / XML來查看您的數據。 這直接反映了SPARQL查詢中的模式。
而且,在您的數據中,除疾病外,所有內容都是字符串文字。 不知道為什么,但是如果您實際上是在建模本體,那么我還將使用RDF資源來解決症狀-至少在您要對症狀做出其他聲明時。
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