<https://info.cseas.kyoto-u.ac.jp/links-ja/manuals/google-2step-varification-ja#breadcrumb>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://info.cseas.kyoto-u.ac.jp/links-ja/manuals/google-2step-varification-ja>