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JavaScript

// Accepts a url and a callback function to run.
function requestCrossDomain(site, callback) {
 
    // If no url was passed, exit.
    if (!site) {
        alert('No site was passed.');
        return false;
    } 
    // Take the provided url, and add it to a YQL query. Make sure you encode it!
    var yql = 'http://query.yahooapis.com/v1/public/yql?q=' + encodeURIComponent('select * from xml where url="' + site + '"') + '&format=xml&callback=?';
 
    // Request that YSQL string, and run a callback function.
    // Pass a defined function to prevent cache-busting.
    $.getJSON(yql, cbFunc);
 
    function cbFunc(data) {
        // If we have something to work with...
        if (data.results[0]) {
            if (typeof callback === 'function') {
                callback(data);
            }
        }
        // Else, Maybe we requested a site that doesn't exist, and nothing returned.
        else throw new Error('Nothing returned from getJSON.');
    }
}
function xmlSuccess(data){
    console.log(data.results[0]);
}
requestCrossDomain('https://s3.amazonaws.com/GSTArticles/GoogleMaps/Landmarks.xml',xmlSuccess);