Pimcore\Model\Document\Tag\Link::getForWebserviceExport PHP Method

    public function getForWebserviceExport($document = null, $params = [])
    {
        $el = parent::getForWebserviceExport($document, $params);
        if ($this->data["internal"]) {
            if (intval($this->data["internalId"]) > 0) {
                if ($this->data["internalType"] == "document") {
                    $referencedDocument = Document::getById($this->data["internalId"]);
                    if (!$referencedDocument instanceof Document) {
                        //detected broken link
                        $document = Document::getById($this->getDocumentId());
                    }
                } elseif ($this->data["internalType"] == "asset") {
                    $referencedAsset = Asset::getById($this->data["internalId"]);
                    if (!$referencedAsset instanceof Asset) {
                        //detected broken link
                        $document = Document::getById($this->getDocumentId());
                    }
                }
            }
        }
        $el->data = $this->data;
        return $el;
    }