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<!DOCTYPE html>
<html>
<body>
​
<p id="demo1"></p>
<p id="demo2"></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();
​
function myFunction(xml) {
    var x, i, attnode, xmlDoc, txt;
    xmlDoc = xml.responseXML;
    txt = "";
    x = xmlDoc.getElementsByTagName('title');
    for (i = 0; i < x.length; i++) { 
        txt += x[i].childNodes[0].nodeValue + "<br>";
    }
    document.getElementById("demo1").innerHTML = txt; 
     for (i = 0; i < x.length; i++) {
         x[i].childNodes[0].nodeValue = "changed";
    }
    txt = ""; 
    for (i = 0; i < x.length; i++) { 
        txt += x[i].childNodes[0].nodeValue + "<br>";
    }
    document.getElementById("demo2").innerHTML = txt;
 }
</script>
</body>
</html>
​