InfGraph graph = context.getGraph();
Node s = env.getGroundVersion(args[0]);
Node p = env.getGroundVersion(args[1]);
ExtendedIterator i = graph.find(s,p,null);
int n = i.toSet().size();
TypeMapper tm = TypeMapper.getInstance();
RDFDatatype type = tm.getTypeByName(XSD.xint.getURI());
Node count = Node.createLiteral(Integer.toString(n),null,type);
env.bind(args[2],count);