public function getNodeIconURL()
    {
        $sURL = null;
        /** @var $oNode TdbShopCategory */
        $oNode = $this->getNodeCopy();
        $oImage = $oNode->GetImage(0, 'navi_icon_cms_media_id', $this->dummyImagesAllowed());
        if ($oImage) {
            $sURL = $oImage->GetRelativeURL();
            $this->sNavigationIconId = $oImage->id;
        }

        return $sURL;
    }