public static function formXml($xml, $file)
    {
        $xml = simplexml_load_string($xml);
        /** @var  $dataArray \SimpleXMLElement[] */
        $dataArray = $xml->attributes();

        $dataFileInfo = new DataFileInfo();
        if (isset($dataArray['Id'])) {
            $dataFileInfo->setId($dataArray['Id']->__toString());
        }
        if (isset($dataArray['Filename'])) {
            $dataFileInfo->setFilename($dataArray['Filename']->__toString());
        }
        if (isset($dataArray['ContentType'])) {
            $dataFileInfo->setContentType($dataArray['ContentType']->__toString());
        }
        if (isset($dataArray['MimeType'])) {
            $dataFileInfo->setMimeType($dataArray['MimeType']->__toString());
        }
        if (isset($dataArray['Size'])) {
            $dataFileInfo->setSize($dataArray['Size']->__toString());
        }
        if (isset($dataArray['DigestType'])) {
            $dataFileInfo->setDigestType($dataArray['DigestType']->__toString());
        }
        if (isset($dataArray['DigestValue'])) {
            $dataFileInfo->setDigestValue($dataArray['DigestValue']->__toString());
        }
        if (isset($dataArray['DfData'])) {
            $dataFileInfo->setDfData($dataArray['DfData']->__toString());
        } elseif (file_exists($file)) {
            $dataFileInfo->setDfData(base64_encode(file_get_contents($file)));
        }

        // TODO: validate data

        return $dataFileInfo;
    }