/**
  * 
  */
 public function setACLWorldAccess($pn_world_access)
 {
     if (!($vn_id = (int) $this->getPrimaryKey())) {
         return null;
     }
     require_once __CA_MODELS_DIR__ . '/ca_acl.php';
     $vn_table_num = $this->tableNum();
     $t_acl = new ca_acl();
     $t_acl->load(array('group_id' => null, 'user_id' => null, 'table_num' => $vn_table_num, 'row_id' => $vn_id));
     // try to load existing record
     $t_acl->setMode(ACCESS_WRITE);
     $t_acl->set('table_num', $vn_table_num);
     $t_acl->set('row_id', $vn_id);
     $t_acl->set('user_id', null);
     $t_acl->set('group_id', null);
     $t_acl->set('access', $pn_world_access);
     if ($t_acl->getPrimaryKey()) {
         $t_acl->update();
     } else {
         $t_acl->insert();
     }
     if ($t_acl->numErrors()) {
         $this->errors = $t_acl->errors;
         return false;
     }
     return true;
 }