$.post(
"/url/to/method",
{ },
function(data){
    var obj2 = eval("("+$(data).children()+")");
    // OR var obj = $.evalJSON($($(data).children())); // Jquery-json
    $body = $("#AAA");
    $body.html(obj.fied);
},
 "xml"
);

eval(" (" + data + ") ");