JQuery XML Parse Bug?

JQuery XML Parse Bug?


As the Book "Learning Jquery" Page 132 Chapter 6 says
Loading an XML Document
--------------------------------------------
write like:
---
        $(document).ready(function() {
                $.get('d.xml',null, function(data) {
                    $(data).find('entry').each(function() {
                        alert('find');
                    });
                },"xml");
            });
---
then you got nothing.
----------------------------------------------
or you write like this:
---
        $(document).ready(function() {
                $.get('d.xml',function(data) {
                    $(data).find('entry').each(function() {
                        alert('find');
                    });
                });
            });
---
you still got nothing
(test In IE7.0.5730.11/FireFox2.0.0.6)(WinXP SP2)
---------------------------------------------
JQuery Can not Parse XML at all?
why the author write this code?
did he test?
---------------------------------------------
by the way
Jquery should add something like this or something else xml framework
http://www.fleegix.org/downloads/xmlparse.js