JQuery Validation

[eluser]RobbieL[/eluser]
Cheers guys. I've been having a look at the JQuery plugins for forms, especially ajaxSubmit. I don't know why I'm having trouble understanding it, maybe it's because it seems just to simple. The example provided says:

Code:

var options = {
    url: myXmlUrl.php,
    dataType: 'xml',
    success: function(responseXML) {
       // responseXML is XML document object
       var data = $('myElement', responseXML).text();
    }
};
$('#myForm').ajaxSubmit(options);

Have I got this right? When the form with the ID of "myForm" is submitted, it runs the options in the variable. Taking into consideration I want to make use of the CI validation, the URL would be the path to my controller that deals with the validation, dataType is simply saying the data returned from the server will be in XML and if everything is successful, run a function that spits out the data from the XML into a DIV with the ID of myElement.

Also, since I began messing around with JQuery, I keep seeing "JSON" popping up. What exactly is the benefit of using JSON over XML?