[eZ publish] & in xml files

When I use this extension of ezXML Export, I found that when the content contains &, the xml can be exported but can't open.
Then i Found that the type of the attribute is a text line, and in the code os ezxmlupload, it just output the content, so i change the code of ezxmlupload.

extension/ezxmlexport/classes/datatypes/ezstring/ezstringxmlexport.php
Line 49:
Change from

return $this->contentObjectAttribute->content();

To

return "<![CDATA[\n"
           .$this->contentObjectAttribute->content()
           . "]]>\n";

also, you can change another file to void this problem.

extension/ezxmlexport/classes/datatypes/eztext/eztextxmlexport.php
Line 33:
Change form

return $this->contentObjectAttribute->content();

To

return
           "<![CDATA[\n"
           .$this->contentObjectAttribute->content()
           . "]]>\n";

In fact that, we just want to add "<![CDATA["  and "]]>" to the start and the end of the content, this method not only takes effect in ezXML Export, but it is a common method to solve the & in xml files.

Have fun! :)