protected function formatInlineStringCellValue($node)
    {
        // inline strings are formatted this way:
        // <c r="A1" t="inlineStr"><is><t>[INLINE_STRING]</t></is></c>
        $tNode = $node->getElementsByTagName(self::XML_NODE_INLINE_STRING_VALUE)->item(0);
        $cellValue = $this->escaper->unescape($tNode->nodeValue);
        return $cellValue;
    }