private void dumpContainerStructure() {
   System.out.println("\n*** Container Structure: ***\n"); // $NON-NLS-1$
   for (int i = 0; i < fAllConstraintVariables.length; i++) {
     ConstraintVariable2 v = fAllConstraintVariables[i];
     if (elemStructure(v) != null && !(elemStructure(v) == ParametricStructure.NONE))
       System.out.println(
           "elemStructure("
               + v.toString()
               + ") = "
               + elemStructure(v)); // $NON-NLS-1$ //$NON-NLS-2$
   }
   System.out.println();
 }
 /*
  * @see java.lang.Object#toString()
  */
 @Override
 public final String toString() {
   return fThenVariable.toString() + " <?= " + fElseVariable.toString(); // $NON-NLS-1$
 }