Xml Php... Please Help!

I have followed the tutorial XML Parsing using PHP {Intermediate}: http://www.kirupa.com/web/xml_php_parse_intermediate.htm and got it to work. However, with this example I only get a heading and description. I want to add author, link and image into the xml and have it outputted as well onto the page. Anyone kind enough to help out and show me hows its done?