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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 first node is an element node
function get_firstchild(n) {
    var x = n.firstChild;
    while (x.nodeType != 1) {
        x = x.nextSibling;
    }
    return x;
}
​
function myFunction(xml) {
    var xmlDoc = xml.responseXML;
    // Get the first child node of the document
    var x = get_firstchild(xmlDoc);
    // Get the first child node of the root element
    var y = get_firstchild(xmlDoc.documentElement);
    document.getElementById("demo").innerHTML =
    "Nodename: " + x.nodeName + 
    " (nodetype: " + x.nodeType + ")<br>" +
    "Nodename: " + y.nodeName + 
    " (nodetype: " + y.nodeType + ")<br>";
}
</script>
​
</body>
</html>
​