/**
  * The singleton method
  *
  * @return Tracker_Semantic_TitleFactory an instance of the factory
  */
 public static function instance()
 {
     if (!isset(self::$instance)) {
         $c = __CLASS__;
         self::$instance = new $c();
     }
     return self::$instance;
 }
 /**
  * Returns an instance of Tracker_Semantic_TitleFactory
  *
  * @return Tracker_Semantic_TitleFactory an instance of the factory
  */
 function getSemanticDescriptionFactory()
 {
     return Tracker_Semantic_DescriptionFactory::instance();
 }