public function getAssessmentItemRefByIdentifiers(\tao_models_classes_service_StorageDirectory $privateCompilationDirectory, array $identifiers)
    {
        $assessmentItemRefs = [];
        
        foreach ($identifiers as $identifier) {
            $assessmentItemRefs[] = $this->getAssessmentItemRefByIdentifier($privateCompilationDirectory, $identifier);
        }
        
        return $assessmentItemRefs;
    }