Simple XHR model sync with XML data

gistfile1.js

model.load({url: 'http://www.company.com/somefile.xml'}, function (err, response) { 
    Y.log("Model load " + response); 
});

// Custom sync layer.
sync: function (action, options, callback) {
    switch (action) {
    case 'read':
        Y.io(options.url, {
            on: {
                failure: function () {
                    callback(Error('XHR request failed'));
                },

                success: function (conn, res) {
                    callback(null, res.responseXML);
                }
            }
        });

        return;

    default:
        Y.log("Model sync action default");
        callback(Error('Invalid action'));
    }
},

// Custom response parser.
parse: function (xml) {
    // TODO: turn the xml object into an object that represents this model's
    // attributes.
    Y.log("Model parse " + xml);
}