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我遇到的问题是 com.hp.hpl.jena.query.QueryParseException: Encountered " <PNAME_LN> "rdfs:domain. 这就是我所做的。我使用 OWL API 读取 xml/owl 文档并使用 Pellet 进行推理。因为除了原因我还想做一些 SPARQL 查询，我使用 Jena 2.10.0 与 Pellet 2.3.0 一起工作。由于兼容性，我无法更改 Jena 的版本。这是代码：

package loadOnto;
import java.io.File;

import org.mindswap.pellet.KnowledgeBase;
import org.mindswap.pellet.jena.PelletInfGraph;
import org.semanticweb.owlapi.apibinding.OWLManager;
import org.semanticweb.owlapi.model.OWLOntology;
import org.semanticweb.owlapi.model.OWLOntologyCreationException;
import org.semanticweb.owlapi.model.OWLOntologyManager;

import com.clarkparsia.pellet.owlapiv3.PelletReasoner;
import com.clarkparsia.pellet.owlapiv3.PelletReasonerFactory;
import com.hp.hpl.jena.query.Query;
import com.hp.hpl.jena.query.QueryExecution;
import com.hp.hpl.jena.query.QueryExecutionFactory;
import com.hp.hpl.jena.query.QueryFactory;
import com.hp.hpl.jena.query.ResultSet;
import com.hp.hpl.jena.query.ResultSetFormatter;
import com.hp.hpl.jena.rdf.model.InfModel;
import com.hp.hpl.jena.rdf.model.ModelFactory;

public class load {
public static void main(String[] args) throws OWLOntologyCreationException {
    // Get hold of an ontology manager
            OWLOntologyManager manager = OWLManager.createOWLOntologyManager();

            // We can also load ontologies from files. Create a file object that points to the local copy
            File file = new File("G:/Protege/owlfiles/Before_Gather.owl");

            // Load the local copy
            OWLOntology loadMODIS = manager.loadOntologyFromOntologyDocument(file);

            PelletReasoner reasoner = PelletReasonerFactory.getInstance().createNonBufferingReasoner( loadMODIS );

            //System.out.println("CheckParsing.should() " + reasoner.isConsistent());

            KnowledgeBase kb = reasoner.getKB();
            PelletInfGraph graph = new org.mindswap.pellet.jena.PelletReasoner().bind( kb );
            InfModel model = ModelFactory.createInfModel( graph );

            String PREFIX = "PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>" +
                    "PREFIX owl: <http://www.w3.org/2002/07/owl#>" +
                    "PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>" +
                    "PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>"+
                    "PREFIX seaice: <http://www.semanticweb.org/SeaIceOntology#>" +
                    "PREFIX repr: <http://sweet.jpl.nasa.gov/2.3/reprDataFormat.owl#>" +
                    "PREFIX realmCryo: <http://sweet.jpl.nasa.gov/2.3/realmCryo.owl#>" +
                    "PREFIX relaMath: <http://sweet.jpl.nasa.gov/2.3/relaMath.owl#>";
            String SELECT = "select ?domain ";
            String WHERE = "where {" +
                    "?dataset seaice:hasSpatialResolution" + "\"4.0\"^^xsd:float." +
                    "?dataset seaice:hasDataFormat repr:GeoTIFF."+
                    "?dataset seaice:recordedDuring seaice:Day."+
                    "seaice:describe rdfs:domain ?domain."+
                    //"seaice:describe rdfs:range realmCryo:SeaIce."+
                    //"?dataset rdf:type ?domain." +
                    "}" ;

            Query queryStr = QueryFactory.create(PREFIX + SELECT + WHERE);
            QueryExecution qe = QueryExecutionFactory.create(queryStr, model);
            ResultSet rs = qe.execSelect();

            ResultSetFormatter.out(System.out,rs);
            rs = null;  qe.close();
            reasoner.dispose();

            //System.out.println("Loaded ontology: " + loadMODIS);
    }
}

该代码在前 3 个查询中运行良好，但在添加 后"seaice:describe rdfs:domain ?domain."，问题立即出现。该代码也适用于seaice:describe rdfs:domain ?domain.单独的“”。错误如下：

Exception in thread "main" com.hp.hpl.jena.query.QueryParseException: Encountered " <PNAME_LN> "rdfs:domain "" at line 1, column 582.
Was expecting one of:
"values" ...
"graph" ...
"optional" ...
"minus" ...
"bind" ...
"service" ...
"filter" ...
"{" ...
"}" ...
";" ...
"," ...
"." ...

at com.hp.hpl.jena.sparql.lang.ParserSPARQL11.perform(ParserSPARQL11.java:102)
at com.hp.hpl.jena.sparql.lang.ParserSPARQL11.parse$(ParserSPARQL11.java:53)
at com.hp.hpl.jena.sparql.lang.SPARQLParser.parse(SPARQLParser.java:37)
at com.hp.hpl.jena.query.QueryFactory.parse(QueryFactory.java:156)
at com.hp.hpl.jena.query.QueryFactory.create(QueryFactory.java:79)
at com.hp.hpl.jena.query.QueryFactory.create(QueryFactory.java:52)
at com.hp.hpl.jena.query.QueryFactory.create(QueryFactory.java:40)
at loadOnto.load.main(load.java:65)
4

1 回答 1

4

一条长线引入了一个错误。您的查询只有一个术语：“ seaice:Day.seaice:describe”。DOT ( .) 在本地名称中是合法prefix的，因此在 DOT 之后添加字母会将其放入local部件中。

  1. 始终在查询字符串中使用换行符。
  2. 在三重模式的末尾写空格点： .不是.
于 2016-01-26T14:06:23.373 回答