public function getList(){
		// define an unique key
		$key  = $this->name.'_'.md5($this->value);
		
		if( isset(self::$listobj[$key]) ){
			return self::$listobj[$key];
		}
		
		if($this->value){
			self::$listobj[$key] = json_decode($this->value);
		}
		else{
			self::$listobj[$key] = false;
		}
		
		return self::$listobj[$key];
	}