<https://tibori.com/2010/09/17/google-%e3%83%9e%e3%83%83%e3%83%97-%e3%83%8a%e3%83%93/#breadcrumblist>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://tibori.com/2010/09/17/google-%E3%83%9E%E3%83%83%E3%83%97-%E3%83%8A%E3%83%93/>