Extracting URIs from RDF web page in Java using Jena Library
- by Prannoy Mittal
I have written following code for extratcting URIs from a web page with content type application/rdf-xml for Linked Data application.
public static void test(String url)
{
try
{
Model read = ModelFactory.createDefaultModel().read(url);
System.out.println("to go");
StmtIterator si;
si = read.listStatements();
System.out.println("to go");
while(si.hasNext())
{
Statement s=si.nextStatement();
Resource r=s.getSubject();
Property p=s.getPredicate();
RDFNode o=s.getObject();
System.out.println(r.getURI());
System.out.println(p.getURI());
System.out.println(o.asResource().getURI());
}
}
catch(JenaException | NoSuchElementException c)
{ }
}
But above code is not extracting all URIs. It provides only few of the URIs.
Please guide me where i Went wrong?? hey Rafeel For Eq:
for XML File :
<?xml version="1.0"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:ex="http://example.org/stuff/1.0/">
<rdf:Description rdf:about="http://www.w3.org/TR/rdf-syntax-grammar"
dc:title="RDF/XML Syntax Specification (Revised)">
<ex:editor>
<rdf:Description ex:fullName="Dave Beckett">
<ex:homePage rdf:resource="http://purl.org/net/dajobe/" />
</rdf:Description>
</ex:editor>
</rdf:Description>
</rdf:RDF>
The output is :
Subject URI is http://www.w3.org/TR/rdf-syntax-grammar
Predicate URI is http://example.org/stuff/1.0/editor
Object URI is null
Subject URI is http://www.w3.org/TR/rdf-syntax-grammar
Predicate URI is http://purl.org/dc/elements/1.1/title
Website is read
