docs: private String indexLabel(Entry child)
                      throws ObjectManagerException
      {
          // Step up the tree until we reach the root.
          String indexLabel = "";
          for (Entry parent = (Entry) child.getParent(); parent != null; parent = (Entry) child.getParent()) {
              if (parent.getLeft() == child)
                  indexLabel = "L," + indexLabel;
              else if (parent.getRight() == child)
                  indexLabel = "R," + indexLabel;
              else
                  indexLabel = "Invalid," + indexLabel;
              child = parent;
          } // for...
          return indexLabel;
      }