Question

我正在使用带有OWL API的Pellet来填充本体和Jena进行一些查询。问题是我在查询标签时没有获得结果。我的代码是：

Path

如果我要求标签，例如使用
reasoner=PelletReasonerFactory.getInstance().createReasoner KnowledgeBase kb = reasoner.getKB(); PelletInfGraph graph = new org.mindswap.pellet.jena.PelletReasoner().bind( kb ); InfModel model = ModelFactory.createInfModel( graph ); Query q = QueryFactory.create(query ); QueryExecution qe = QueryExecutionFactory.create( q, model ); ResultSet rs = qe.execSelect(); ResultSetFormatter.out( rs ); 我得到一个空字符串作为标签。该查询适用于protegè，提供所请求的标签。有什么建议吗？

本体论的片段：

Select ?x ?y 
 WHERE { ?x rdfs:label ?y.}

这是项目的maven pom文件：

  <Thing rdf:about="onto.owl#Erba">
    <rdf:type rdf:resource="http://linkedgeodata.org/ontology/Municipality"/>
    <rdf:type rdf:resource="http://linkedgeodata.org/ontology/Place"/>
    <rdf:type rdf:resource="onto.owl#Comune"/>
    <rdf:type rdf:resource="onto.owl#Localizzazione"/>
    <rdf:type rdf:resource="http://www.w3.org/2002/07/owl#NamedIndividual"/>
    <rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Erba</rdfs:label>
    <Locations:haLocalizzazione rdf:resource="onto.owl#Italia"/>
    <Locations:haLocalizzazione rdf:resource="onto.owl#Como"/>
    <Locations:haLocalizzazione rdf:resource="onto.owl#Lombardia"/>
    <Locations:haProvincia rdf:resource="onto.owl#Como"/>
</Thing>

Pellet Jena和OWL API Sparql查询标签

0 个答案: