Edit This Code:
<!DOCTYPE html>
<html>
<body>

<p id="demo"></p>

<script>
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
    if (xhttp.readyState == 4 && xhttp.status == 200) {
        myFunction(xhttp);
    }
};
xhttp.open("GET", "books.xml", true);
xhttp.send();

function myFunction(xml) {
    var xmlDoc = xml.responseXML;
    var x = xmlDoc.getElementsByTagName("title");
    x[0].setAttribute("edition", "first");
    document.getElementById("demo").innerHTML =
    "Edition: " + x[0].getAttribute("edition");
}
</script>
</body>
</html>


Result:
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