code: @Override
      public void usage(final UsageBuilder str, final int indentLevel)
      {
          if (min != null)
              if (max != null)
                  str.append("The value must be from " + min.toString() + " to " + max.toString() + " inclusive");
              else
                  str.append("The value must be at least " + min.toString() + ".");
          else
              str.append("The value must be less than or equal to " + max.toString() + ".");
      }
docs: {@inheritDoc}