處理數據值限制

Question

我試圖使用OWL API運行DL查詢，使用DL查詢示例（http://sourceforge.net/p/owlapi/code/ci/aef6981535f07a2d0d44c394b9f4d5415f36025a/tree/contract/src/test/java/org/coode/owlapi/examples/DLQueryExample.java）

hasExperience一些（體驗和hasYearsOfExperience一些INT [> = 1]）

這運行良好，並顯示了預期的結果門徒，但返回在Java中出現以下錯誤：

Exception in thread "AWT-EventQueue-0" java.lang.RuntimeException: Prefix not registered for prefix name: : 
    at org.semanticweb.owlapi.util.DefaultPrefixManager.getIRI(DefaultPrefixManager.java:199) 
    at org.coode.owlapi.manchesterowlsyntax.ManchesterOWLSyntaxEditorParser.getIRI(ManchesterOWLSyntaxEditorParser.java:3112) 
    at org.coode.owlapi.manchesterowlsyntax.ManchesterOWLSyntaxEditorParser.getOWLDatatype(ManchesterOWLSyntaxEditorParser.java:563) 
    at org.coode.owlapi.manchesterowlsyntax.ManchesterOWLSyntaxEditorParser.parseDataRangePrimary(ManchesterOWLSyntaxEditorParser.java:1032) 
    at org.coode.owlapi.manchesterowlsyntax.ManchesterOWLSyntaxEditorParser.parseDataUnionOf(ManchesterOWLSyntaxEditorParser.java:1013) 
    at org.coode.owlapi.manchesterowlsyntax.ManchesterOWLSyntaxEditorParser.parseDataIntersectionOf(ManchesterOWLSyntaxEditorParser.java:995) 
    at org.coode.owlapi.manchesterowlsyntax.ManchesterOWLSyntaxEditorParser.parseDataRange(ManchesterOWLSyntaxEditorParser.java:988) 
    at org.coode.owlapi.manchesterowlsyntax.ManchesterOWLSyntaxEditorParser.parseDataRestriction(ManchesterOWLSyntaxEditorParser.java:908) 
    at org.coode.owlapi.manchesterowlsyntax.ManchesterOWLSyntaxEditorParser.parseNonNaryClassExpression(ManchesterOWLSyntaxEditorParser.java:787) 
    at org.coode.owlapi.manchesterowlsyntax.ManchesterOWLSyntaxEditorParser.parseUnion(ManchesterOWLSyntaxEditorParser.java:688) 
    at org.coode.owlapi.manchesterowlsyntax.ManchesterOWLSyntaxEditorParser.parseIntersection(ManchesterOWLSyntaxEditorParser.java:663) 
    at org.coode.owlapi.manchesterowlsyntax.ManchesterOWLSyntaxEditorParser.parseNestedClassExpression(ManchesterOWLSyntaxEditorParser.java:1212) 
    at org.coode.owlapi.manchesterowlsyntax.ManchesterOWLSyntaxEditorParser.parseObjectRestriction(ManchesterOWLSyntaxEditorParser.java:819) 
    at org.coode.owlapi.manchesterowlsyntax.ManchesterOWLSyntaxEditorParser.parseNonNaryClassExpression(ManchesterOWLSyntaxEditorParser.java:783) 
    at org.coode.owlapi.manchesterowlsyntax.ManchesterOWLSyntaxEditorParser.parseUnion(ManchesterOWLSyntaxEditorParser.java:688) 
    at org.coode.owlapi.manchesterowlsyntax.ManchesterOWLSyntaxEditorParser.parseIntersection(ManchesterOWLSyntaxEditorParser.java:663) 
    at org.coode.owlapi.manchesterowlsyntax.ManchesterOWLSyntaxEditorParser.parseNestedClassExpression(ManchesterOWLSyntaxEditorParser.java:1212) 
    at org.coode.owlapi.manchesterowlsyntax.ManchesterOWLSyntaxEditorParser.parseObjectRestriction(ManchesterOWLSyntaxEditorParser.java:819) 
    at org.coode.owlapi.manchesterowlsyntax.ManchesterOWLSyntaxEditorParser.parseNonNaryClassExpression(ManchesterOWLSyntaxEditorParser.java:783) 
    at org.coode.owlapi.manchesterowlsyntax.ManchesterOWLSyntaxEditorParser.parseUnion(ManchesterOWLSyntaxEditorParser.java:688) 
    at org.coode.owlapi.manchesterowlsyntax.ManchesterOWLSyntaxEditorParser.parseIntersection(ManchesterOWLSyntaxEditorParser.java:663) 
    at org.coode.owlapi.manchesterowlsyntax.ManchesterOWLSyntaxEditorParser.parseClassExpression(ManchesterOWLSyntaxEditorParser.java:650) 
    at org.coode.owlapi.examples.DLQueryParser.parseClassExpression(DLQueryManager.java:413) 
    at org.coode.owlapi.examples.DLQueryEngine.getInstances(DLQueryManager.java:324) 
    at org.coode.owlapi.examples.DLQueryManager.getInstances(DLQueryManager.java:127) 

任何想法如何解決這一問題？

Answer 1

問題似乎來自您處理前綴而不是DL查詢的方式。

請確保您的默認前綴是存在的：您可以查看您的.owl文件的頂部聲明的前綴映射。

在你的代碼應該有類似的東西太多：

String base = "http://example.com/"; 
PrefixManager pm = new DefaultPrefixManager(base); 

你也可以看看documentation，以便更多地瞭解前綴。