A very simple extension that accepts a YQL query and makes the call returning data from YQL in json format ^(default).
Accepts all inherited options from the Request.* classes up the Request.JSONP family line but url must be the service url. The default value of format is“json” it can be any of the defined YQL formats.

NB: The .send() method needs to be called and a onSuccess defined for it to do anything. Example:

new Request.YQL("show tables",{
	onSuccess: function(data) {
				console.log(data);
			 }
}).send();

Mo’ Info

• http://developer.yahoo.com/yql/console/
• http://mootools.net/docs/more/Request/Request.JSONP

/** ============================================================================
 * YQL driver
 * Extends: Request.JSONP
 *
 * @version		1.0
 *
 * @license		MIT-style license
 * @author 		Rhys Burnie
 * @copyright		Author <rhys [at] hybridgarden.com>
 * @param 		{String} YQL query
 * @param 		{Object} Request options
 * 				   NB: options.url must be to the YQL service (default to v1 path)
 */
if( ($chk(Request) && $chk(Request.JSONP)) && !$chk(Request.YQL) ) {
	Request.YQL = new Class({
		Extends: Request.JSONP,
		options: {
			url: "http://query.yahooapis.com/v1/public/yql?",
			format: 'json'
		},
		initialize: function(query,options) {
			this.parent(options);
	        	if (!query)
	            	return;
	        	this.options.url = this.options.url + 'q=' + encodeURIComponent(query) + '&format='+this.options.format;
		},
	    success: function(data, script) {
	        this.parent(data, script);
	    }
	});
}