void demo6() {

  string aname = "atlasopt";
  string tname = "atlasopt_example_zll-10.0.1";
  string dname = "hma.dc2.003007.digit.A1_z_ee.aod-1000.10files";

  aid = asc.id(aname);
  tid = tsc.id(tname);
  did = dsc.id(dname);

  papp = ar.extract(aid);
  ptsk = tr.extract(tid);
  pdst = dr.extract(did);

}