final XPath xPathApi = getXPathAPI().createXPath(f -> {});
        xPathApi.setNamespaceContext(new DefaultNamespaceContext(doc.getNodeType() == Node.DOCUMENT_NODE ? doc.getDocumentElement() : doc));
        return xPathApi.evaluateExpression(xpath, doc, XPathNodes.class);
    }

    protected XPathAPI getXPathAPI() {
        try {

            for (int i = 0; i < nodeList.getLength(); i++) {
                final Node childNode = nodeList.item(i);
                parseTextContent(childNode, buf);
            }
        } else if (node.getNodeType() == Node.TEXT_NODE) {
            final String value = node.getTextContent();
            if (value != null) {
                final String content = value.trim();
                if (content.length() > 0) {

     */
    public static void appendNode(final Node node, final StringBuilder buf) {
        assertArgumentNotNull("node", node);
        assertArgumentNotNull("buf", buf);

        switch (node.getNodeType()) {
        case Node.ELEMENT_NODE:
            appendElement((Element) node, buf);
            break;
        case Node.TEXT_NODE:
            appendText((Text) node, buf);
            break;