attr_init_APT (&structure, zapt, 4);
attr_init_APT (&completeness, zapt, 6);
attr_init_APT (&relation, zapt, 2);
attr_init_APT (&sort_relation, zapt, 7);
attr_init_APT (&structure, zapt, 4);
attr_init_APT (&completeness, zapt, 6);
attr_init_APT (&relation, zapt, 2);
attr_init_APT (&sort_relation, zapt, 7);