<https://blog.earthyworld.com/archives/category/iphone/iphone%e3%82%a2%e3%83%97%e3%83%aa%e5%88%b6%e4%bd%9c/cocos2d/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://blog.earthyworld.com/archives/category/iphone/iphone%E3%82%A2%E3%83%97%E3%83%AA%E5%88%B6%E4%BD%9C/cocos2d/>