Unresolved prefixed name: rdfs:subClassOf in SPARQL query

Question

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.lang.*;
import java.util.regex.*;
import java.         


        

Answer 1

String queryString ="SELECT ?ds ?o WHERE {?ds  rdfs:subClassOf ?o }";

Should be

String queryString ="PREFIX rdfs: 
SELECT ?ds ?o WHERE {?ds  rdfs:subClassOf ?o }";