success: function(xml) {
alert("başarılı");
}
error: function()

} dan sonra virgül koyman gerekli

$.ajax({
type: "GET",
url: "hello.xml",
dataType: "xml",
success: function(xml) {
alert("başarılı");
},
error: function() {
alert("The XML File could not be processed correctly.");
}
});