static O getSingleFieldFromSingletonConcept(S progID, S conceptClass, S field) {
  RemoteDB db = new RemoteDB(progID);
  if (db.functional()) {
    L<RC> list = db.xlist(conceptClass);
    if (empty(list)) null;
    ret db.xget(first(list), field);
  }
  Concepts c = new Concepts(progID).safeLoad();
  ret cget(first(c.list(conceptClass)), field);
}