public static function namespace($key, $path){
        if(!array_key_exists($key, self::$namespaces))
            self::$namespaces[$key] = $path;
    }
public static function namespace($key, $path){
        if(!array_key_exists($key, self::$namespaces))
            self::$namespaces[$key] = $path;
    }
public static function namespace ( $ key , $ path ) { if ( ! array_key_exists ( $ key , self :: $ namespaces ) ) self :: $ namespaces [ $ key ] = $ path ; }
specifica di namespace per le path
specifica di namespace per le path