// make concept instance that is not connected to DB
static <A extends Concept> A nuLike unlisted(Class<A> c, O... args) {
  concepts_unlisted.set(true);
  try {
    ret nuObject(c, args);
  } finally {
    concepts_unlisted.set(null);
  }
}

static Concept nuLike unlisted(S name, O... args) {
  Class<? extends Concept> cc = findClass(name);
  concepts_unlisted.set(true);
  try {
    ret cc != null ? nuObject(cc) : new Concept(name);
  } finally {
    concepts_unlisted.set(null);
  }
}