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  1. or download this
    package Node;

use constant FIRST_IDX  => 0;
use constant IDX_PARENT => FIRST_IDX + 0;
use constant NEXT_IDX   => FIRST_IDX + 1;
  2. or download this
    package ElementNode;

...
use constant IDX_NAME  => FIRST_IDX + 0;
use constant IDX_ATTS  => FIRST_IDX + 1;
use constant NEXT_IDX  => FIRST_IDX + 2;
  3. or download this
    use constant IDX_PARENT => __PACKAGE__->SUPER::IDX_PARENT();
  4. or download this
    package Node;

...
use constant IDX_PARENT => FIRST_IDX + 0;
use constant IDX_ISROOT => FIRST_IDX + 1;
use constant NEXT_IDX   => FIRST_IDX + 2;