/**
* Get the singleton instance of Head.
* @param array Default values
* @return Head
*/
public static function instance(array $data = array(), $config_name = 'default')
{
// Check if instance exists
if (self::$_instance === NULL) {
// Create a new instance
self::$_instance = new self();
// Add values from config file
self::$_instance->add(Kohana::config('xhtml.' . $config_name . '.head'));
}
// Add values from supplied data
self::$_instance->add($data);
return self::$_instance;
}
