retrieve XML from restfulx service update the details

//retrieve XML from restfulx service update the details
var xmlOpts:Object = { URL: "people/summary_by_city.xml", method: "POST", 
     data: {city: 'chennai'}, unmarshall: false};
          
Rx.http(function(result:XML):void {
     cityWiseSummary = result;            
                    for each (var city:XML in cityWiseSummary .*) {
                      child['city_name'] = Rx.models.showById(City, child['city_id']);
                    }
}).invoke(xmlOpts);
}