public String formatXML(Node node, String tab_str)
{
    String formatted = "";

    if (node.getNodeType() == Node.ELEMENT_NODE)
    {
        String attributes = "";

        var attributes = node.getAttributes();
        for (int k=0; k<attributes.getLength(); k++)
        {
            var attr = attributes[k];
            attributes += " " + attr.getNodeName() + "=\"" + attr.getNodeValue() + "\"";
        }

        formatted = tab_str + "<" + node.getNodeName() + attributes + ">\n";

        for (int i=0; i<node.getChildNodes().getLength(); i++)
            formatted = formatted + formatXML(node.getChildNodes().item(i), tab_str + "    ");

        formatted = formatted + tab_str + "</" + node.getNodeName() + ">\n";
    }
    else
        if (node.toString().trim().length() > 0)
            formatted = tab_str + node.toString() + "\n";

    return formatted;
}