XST Module
Developers can stream data from non module functions using this module. As you know Sahana framework needs module name to stream data. But, some functionalities like location handler does not have specific module. So that earlier these functions used xml.php to stream. In order to avoid xml.php or stream.php, develpers can use xst module.
E.g.
var url2=url + "act=get_loc&mod=xst&stream=text&lvl="+curlevel+"&sel="+selection;