I think that loading the files in the postgre database is possible. I have used Talend a few times but not to perform that type of operation.
So the best thing for you would be to go look at the Talend website ( http://www.talend.com/
) and then go onto the tutorials ( http://www.talendforge.org/tutorials/menu.php
) section. Going on both of these links should answer your question about loading XML files in postgre database.