/**
* the singleton pattern
*
* @return SoBilling_Controller_SoEvent
*/
public static function getInstance()
{
if (self::$_instance === NULL) {
self::$_instance = new self();
require_once 'worg/wsf/ClassLoader.php';
WsfClassLoader::init(CSopen::instance()->getLibPath() . 'wsflib/', "");
libxml_use_internal_errors(false);
}
return self::$_instance;
}
