You are looking at the HTML representation of the WDDX format.
HTML is good for debugging, but probably is not suitable for your application.
See complete documentation, or API help for more information. 
<?xml version="1.0"?><wddxPacket version="1.0"> <header/> <data><struct><var name="warnings"><struct><var name="query"><struct><var name="*"><string>The ``query'' module has been disabled.</string></var></struct></var></struct></var></struct> </data></wddxPacket>