cdm/src/main/java/ucar/nc2/util/rc/RC.java
public Triple
  insert(Triple t) {
    if (t.key == null) return null;
    List<Triple> list = triplestore.get(t.key);
    if (list == null) list = new ArrayList<Triple>();
    Triple prev = addtriple(list, t);
    triplestore.put(t.key, list);
    return prev;
  }
public Triple
  insert(Triple t) {
    if (t.key == null) return null;
    List<Triple> list = triplestore.get(t.key);
    if (list == null) list = new ArrayList<Triple>();
    Triple prev = addtriple(list, t);
    triplestore.put(t.key, list);
    return prev;
  }
Allow for external loading