*/
    public boolean zContains(Integer z) throws Exception {        boolean b = false;        if (z != null) {            if (z.isGreaterThanOrEqualTo((Integer) getChildItem(Space.ORIGIN_Z_COORDINATE))                && z.isSmallerThan((Integer) getChildItem(Space.EXPANSE_Z_COORDINATE))) {                b = true;            }        } else {            throw new Exception("Could not check z position. The z position is null.");        }        return b;    }