Tryit Editor v1.8

Source Code:
<!DOCTYPE html> <html> <head> <script src="loadxmldoc.js"> </script> </head> <body> <script> xmlDoc=loadXMLDoc("books.xml"); x=xmlDoc.getElementsByTagName("title"); //add a new attribute to each title element for(i=0;i<x.length;i++) { x[i].setAttribute("edition","first"); } //Output title and edition value for (i=0;i<x.length;i++) { document.write(x[i].childNodes[0].nodeValue); document.write(" - Edition: "); document.write(x[i].getAttribute("edition")); document.write("<br>"); } </script> </body> </html>
Result:
W3Schools.com - Try it yourself