<https://blog.cavedu.com/2013/02/20/gadgeteer4-1%e3%80%814-2%e5%87%bd%e5%bc%8f%e5%ba%ab%e7%89%88%e6%9c%ac%e8%bd%89%e6%8f%9b/#breadcrumb>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://blog.cavedu.com/2013/02/20/gadgeteer4-1%E3%80%814-2%E5%87%BD%E5%BC%8F%E5%BA%AB%E7%89%88%E6%9C%AC%E8%BD%89%E6%8F%9B/>