gistfile1.js

(function(){
    var d = document.implementation.createDocument('', '', null);
    d.appendChild(d.createTextNode('\n'));
    var opml = d.appendChild(d.createElement('opml'));
    opml.appendChild(d.createTextNode('\n\t'));
    var head = opml.appendChild(d.createElement('head'));
    opml.appendChild(d.createTextNode('\n\t'));
    var body = opml.appendChild(d.createElement('body'));
    opml.appendChild(d.createTextNode('\n'));
    alert(new XMLSerializer().serializeToString(d));
})()