code: public boolean validate()
    {
      boolean correct = true;
      if (population() > 1)
      {
        java.util.Comparator comp = index().insertComparator();
        int xcc = 0;
        for (int i = 0; i < population()-1; i++)
        {
          xcc = comp.compare(_nodeKey[i], _nodeKey[i+1]);
          if ( !(xcc < 0) )
            {
              System.out.println("Entry " + i + " not less than entry " + i+1);
              correct = false;
            }
        }
      }
      return correct;
    }
docs: Used by test code to make sure that all of the keys within
  a node are in the correct collating sequence.