This is a dirty implementation of a GO SMS Pro's backup reader. Thanks to Waseem Kathia.

main.js

(function () {
    var fs = require("fs"),
        xml = require("xml-js");

    var content = fs.readFileSync("gosms_sys119.xml", "utf8");
    var result = xml.xml2json(content, { compact: true, spaces: 4 });

    var styleSent = "color: blue;";
    var styleReceived = "color: red;";
    var stylePara = "font-family: Calibri; font-size: 11pt;";
    var styleHeader = "font-family: Calibri; font-size: 18pt;";

    var json = JSON.parse(result);

    var GoSms = json["GoSms"];
    var SMS = GoSms["SMS"];

    function formatAMPM(date) {
        return date.getHours() >= 12 ? 'PM' : 'AM';
    }

    var stage1Data = [];
    SMS.forEach(function (value, index) {
        var date = new Date(parseInt(value["date"]["_text"]));

        var hours = date.getHours();
        if (hours >= 12) {
            hours -= 12;
        }

        if (hours == 0) {
            hours = 12;
        }

        var time = hours + ":" + date.getMinutes() + " " + formatAMPM(date) +
             " " + date.getDate() + "-" + date.getMonth() + "-" + date.getFullYear();

        stage1Data[index] = {
            contactName: value["contactName"]["_text"],
            time: time,
            contactNumber: value["address"]["_text"],
            body: value["body"]["_text"],
            type: value["type"]["_text"]
        };
    });

    var stage2Data = {};
    stage1Data.forEach(function (value, index) {
        var contactName = value["contactName"],
            contactNumber = value["contactNumber"],
            time = value["time"],
            body = value["body"],
            type = value["type"] == "1" ? "received" : "sent";

        if (contactNumber == undefined) {
            return;
        }

        if (stage2Data[contactNumber] == undefined) {
            stage2Data[contactNumber] = {
                contactName: contactName,
                contactNumber: contactNumber,
                messages: []
            };
        }

        stage2Data[contactNumber].messages.push({
            body: body,
            time: time,
            type: type
        });
    });

    var content = "";
    Object.keys(stage2Data).forEach(function (value, index) {
        var data = stage2Data[value],
            contactName = data["contactName"],
            contactNumber = data["contactNumber"],
            messages = data["messages"];

        content += "<h2 style=\""+styleHeader+"\">" + contactName + " : " + contactNumber + "</h2>\r\n";

        messages.forEach(function (value, index) {
            var body = value["body"],
                type = value["type"],
                time = value["time"]

            if (type == "received") {
                content += "<p style=\""+stylePara+"\"><b style=\""+styleReceived+"\">" + contactName + "</b> (" + time + ") : " + body + "</p>\r\n";
            }
            else if (type == "sent") {
                content += "<p style=\""+stylePara+"\"><b style=\""+styleSent+"\">Me</b> (" + time + ") : " + body + "</p>\r\n";
            }
        });
    });

    fs.writeFileSync("output.html", content, "utf8");

}());\