/**
  * @param SimpleXMLElement $a
  */
 public function simpleUserImportElement(SimpleXMLElement $a)
 {
     global $rbacadmin;
     $attributes = $a->attributes();
     $action = $attributes->action;
     $user_id_type = $a->User->attributes()->id_type;
     $user_id = (string) $a->User;
     $org_unit_id_type = $a->OrgUnit->attributes()->id_type;
     $org_unit_id = (string) $a->OrgUnit;
     $role = (string) $a->Role;
     if (!($user_id = $this->buildUserId($user_id, $user_id_type))) {
         $this->addError('user_not_found', $a->User);
         return;
     }
     if (!($org_unit_id = $this->buildRef($org_unit_id, $org_unit_id_type))) {
         $this->addError('org_unit_not_found', $a->OrgUnit);
         return;
     }
     $org_unit = new ilObjOrgUnit($org_unit_id);
     if ($role == 'employee') {
         $role_id = $org_unit->getEmployeeRole();
     } elseif ($role == 'superior') {
         $role_id = $org_unit->getSuperiorRole();
     } else {
         $this->addError('not_a_valid_role', $user_id);
         return;
     }
     if ($action == 'add') {
         $rbacadmin->assignUser($role_id, $user_id);
         $this->stats['created']++;
     } elseif ($action == 'remove') {
         $rbacadmin->deassignUser($role_id, $user_id);
         $this->stats['removed']++;
     } else {
         $this->addError('not_a_valid_action', $user_id);
     }
 }