Listing All Classes And Instances from N-triple file with Jena

Question

I am a beginner and want to list all the entities/classes and instance from N-triple file through Jena but I don't know how to do it. Or it is possible to do this with Sparql.

I have already load the N-triple file as a JENA model.

Model model = ModelFactory.createDefaultModel();
RDFDataMgr.read(model, "F:\\dbtune_org_magnatune_sparqlCut1.nt", Lang.NTRIPLES);
            

Here is the link of N-triple file: https://drive.google.com/file/d/143PJ8_fgJdyNbB8sjvErpdP371uO6glv/view

Answer 1

I am not entirely sure what is being asked here, but the starting point could be a simple SPARQL query:

SELECT DISTINCT ?instance ?class {
  ?instance a ?class
}

which gives you all the "instances" (anything that is in a rdf:type relation with anything) and corresponding classes. Or you could do

SELECT DISTINCT ?class {
  ?instance a ?class
}

which gives you everything that is used as a class. And so on...