public function getReferencedAttributes()
    {
        $objMetaModel  = $this->getMetaModel();
        $objAttribute  = $objMetaModel->getAttributeById($this->get('attr_id'));
        $objAttribute2 = $objMetaModel->getAttributeById($this->get('attr_id2'));
        $arrResult     = [];

        if ($objAttribute) {
            $arrResult[] = $objAttribute->getColName();
        }

        if ($objAttribute2) {
            $arrResult[] = $objAttribute2->getColName();
        }

        return $arrResult;
    }