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[英]OWLAPI : HermiT reasoner thows “UnsupportedDatatypeException” for data type from imported Ontology
[英]HermiT reasoner thows “UnsupportedDatatypeException” for datatype
我想從本體文件dbpedia_2016-10.owl
(從https://wiki.dbpedia.org/downloads-2016-10下載,我通過參考其他一些代碼構建了這個方法)這方面的初學者:
public static void importOntology(String ontologyFile) throws Exception {
File file = new File(ontologyFile);
if (file.exists()) {
OWLOntologyManager manager = OWLManager.createOWLOntologyManager();
OWLOntology ontology = manager.loadOntologyFromOntologyDocument(file);
Reasoner reasoner=new Reasoner(ontology);
if (!reasoner.isConsistent()) {
throw new Exception("Ontology is inconsistent");
}
for (OWLClass c :ontology.getClassesInSignature(true)) {
String classString = c.toString();
System.out.println(classString);
if (classString.contains("#")) {
classString = classString.substring(classString.indexOf("#")+1,classString.lastIndexOf(">"));
}
Set<OWLClassExpression> superclasses = c.getSuperClasses(ontology);
if (superclasses.isEmpty()) {
System.out.println(classString + " is owl#Thing.");
} else {
for (OWLClassExpression superc:superclasses) {
System.out.println(superc + " is a parent.");
}
}
}
}
}
當我聲明並實例化 HermiT 推理器時,出現以下異常:
org.semanticweb.HermiT.datatypes.UnsupportedDatatypeException: HermiT supports all and only the datatypes of the OWL 2 datatype map, see
http://www.w3.org/TR/owl2-syntax/#Datatype_Maps.
The datatype 'http://dbpedia.org/datatype/hour' is not part of the OWL 2 datatype map and
no custom datatype definition is given;
therefore, HermiT cannot handle this datatype.
現在,我不明白 HermiT 正在抱怨它無法識別的數據類型,但是如何在不修改本體的情況下解決這個問題?
我不確定它是否會有所幫助,但這些是我的項目的依賴項:
<dependencies>
<dependency>
<groupId>com.hermit-reasoner</groupId>
<artifactId>org.semanticweb.hermit</artifactId>
<version>1.3.8.4</version>
</dependency>
<dependency>
<groupId>net.sourceforge.owlapi</groupId>
<artifactId>owlexplanation</artifactId>
<version>2.0.0</version>
</dependency>
</dependencies>
在此先感謝您的指導!
為了測試這一點,我將 DBPedia 本體加載到 Protege 5.5 中,並使用 HermiT 1.4.3.517 對其進行推理。 這沒有問題。 因此,我認為您應該查看您的 OWL API 和 HermiT maven 依賴項。
<dependency>
<groupId>net.sourceforge.owlapi</groupId>
<artifactId>owlapi-distribution</artifactId>
<version>5.1.12</version>
</dependency>
<dependency>
<groupId>net.sourceforge.owlapi</groupId>
<artifactId>org.semanticweb.hermit</artifactId>
<version>1.4.3.517</version>
</dependency>
更新
您似乎也錯誤地啟動了推理器。 這里有一些使用上面的 Maven 依賴項的工作代碼。
import org.semanticweb.HermiT.ReasonerFactory;
import org.semanticweb.owlapi.apibinding.OWLManager;
import org.semanticweb.owlapi.model.*;
import org.semanticweb.owlapi.reasoner.OWLReasoner;
import org.semanticweb.owlapi.reasoner.OWLReasonerFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.slf4j.Marker;
import org.slf4j.MarkerFactory;
import java.io.File;
public class LoadDBPedia {
private static Logger logger = LoggerFactory.getLogger(LoadDBPedia.class);
// Why This Failure marker
private static final Marker WTF_MARKER = MarkerFactory.getMarker("WTF");
private static String ONTOLOGY_FILE = "/path_to_ontology/dbpedia_2016-10.owl";
public static void main(String[] args) {
try {
File file = new File(ONTOLOGY_FILE);
if (file.exists()) {
OWLOntologyManager manager = OWLManager.createOWLOntologyManager();
OWLOntology ontology = manager.loadOntologyFromOntologyDocument(file);
OWLReasonerFactory reasonerFactory = new ReasonerFactory();
OWLReasoner reasoner = reasonerFactory.createReasoner(ontology);
if (!reasoner.isConsistent()) {
logger.debug("Ontology is inconsistent");
throw new Exception("Ontology is inconsistent");
} else {
logger.debug("Ontology is consistent");
}
}
} catch (Throwable t) {
logger.error(WTF_MARKER, t.getMessage(), t);
}
}
}
您的代碼可能有什么問題?
(1) 這一行Reasoner reasoner=new Reasoner(ontology);
是可疑的,因為 (a) 不清楚您從哪里獲得Reasoner
類,以及 (b) 似乎不是來自 HermiT,因為 HermiT 中Reasoner
的構造函數具有不同的簽名。
(2) 您依賴於owlexplanation
而不是owlapi-distribution
的事實是可疑的。
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