code: public Attribute attribute(final int _idx)
          throws EFapsException
      {
          initialize(true);
          Attribute ret = null;
          final int idx = _idx - 1;
          if (this.selection.getSelects().size() > idx) {
              final Select select = this.selection.getSelects().get(idx);
              ret = attribute(select);
          }
          return ret;
      }
docs: Attribute.
  
  @param _idx the idx
  @return the attribute
  @throws EFapsException the e faps exception