The following code is to read a schema and a data file to find rdf.type of colin and Person. However, I am getting the error:
Exception in thread "main" org.apache.jena.riot.RiotException: [line: 1, col: 1 ] Content is not allowed in prolog. The code is given below:
public void reason(){
String NS = "urn:x-hp:eg/";
String fnameschema = "D://Work//EclipseWorkspace//Jena//data//rdfsDemoSchema.rdf";
String fnameinstance = "D://Work//EclipseWorkspace//Jena//data//rdfsDemoData.rdf";
Model schema = FileManager.get().loadModel(fnameschema);
Model data = FileManager.get().loadModel(fnameinstance);
InfModel infmodel = ModelFactory.createRDFSModel(schema, data);
Resource colin = infmodel.getResource(NS+"colin");
System.out.println("Colin has types");
for (StmtIterator i = infmodel.listStatements(colin, RDF.type, (RDFNode)null); i.hasNext(); ) {
Statement s = i.nextStatement();
System.out.println(s);
}
Resource Person = infmodel.getResource(NS+"Person");
System.out.println("\nPerson has types:");
for (StmtIterator i = infmodel.listStatements(Person, RDF.type, (RDFNode)null); i.hasNext(); ) {
Statement s = i.nextStatement();
System.out.println(s);
}
}
The file rdfsDemoData.rdf
@prefix eg: <urn:x-hp:eg/> .
<Teenager rdf:about="⪚colin">
<mum rdf:resource="⪚rosy" />
<age>13</age>
</Teenager>
The file rdfsDemoSchema.rdf
@prefix eg: <urn:x-hp:eg/> .
<rdf:Description rdf:about="⪚mum">
<rdfs:subPropertyOf rdf:resource="⪚parent"/>
</rdf:Description>
<rdf:Description rdf:about="⪚parent">
<rdfs:range rdf:resource="⪚Person"/>
<rdfs:domain rdf:resource="⪚Person"/>
</rdf:Description>
<rdf:Description rdf:about="⪚age">
<rdfs:range rdf:resource="&xsd;integer" />
</rdf:Description>
Your data is bad syntax. You are mixing Turtle and RDF/XML. RDF/XML does nto have @prefix
- it uses XML's namespaces. It looks like you want an XML entity declaration like:
<?xml version="1.0"?>
<!DOCTYPE rdf:RDF [
<!ENTITY eg "urn:x-hp:eg/" >
]>
...
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