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<!DOCTYPE html>
<html>
<body>
<p id="demo"></p>
<script>
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
    if (this.readyState == 4 && this.status == 200) {
        myFunction(this);
    }
};
xhttp.open("GET", "books.xml", true);
xhttp.send();
// Check if the last node is an element node
function get_lastchild(n) {
    var x = n.lastChild;
    while (x.nodeType != 1) {
        x = x.previousSibling;
    }
    return x;
}
function myFunction(xml) {
    var xmlDoc = xml.responseXML;
    var x = xmlDoc.documentElement;
    var lastNode = get_lastchild(x);
    document.getElementById("demo").innerHTML = 
    lastNode.localName; 
}
</script>
</body>
</html>