System.out.println("The database contains resources of type metric:");
while (iters.hasNext()) {
Resource resource = iters.nextResource();
System.out.println(" " + resource.getLocalName());
/* identifier */
StmtIterator stmtI1 = model.listStatements(resource, identifier, (RDFNode)null);
while(stmtI1.hasNext()) {
Statement statement = stmtI1.nextStatement();
if(statement.getObject().isLiteral()) {
System.out.println(" identifier:"+statement.getObject());
} else if(statement.getObject().isResource()) {