code: @Override
      public void resolve(final ValueStack values) throws Exception
      {
          if (values.size() < 2)
              throw new Exception("missing operands for " + toString());
          try
          {
              final boolean b0 = values.popBoolean();
              final boolean b1 = values.popBoolean();
              values.push(new Boolean(b1 || b0));
          } catch (final ParseException e)
          {
              e.fillInStackTrace();
              throw new Exception(toString() + "; " + e.getMessage(), e);
          }
      }
docs: {@inheritDoc}