<https://ability-jobsearch.com/archives/1800/%e3%83%8b%e3%83%81%e3%83%ac%e3%82%a4%e3%83%95%e3%83%bc%e3%82%ba%e6%9c%ac%e6%96%87%e7%94%bb%e5%83%8f#itempage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://ability-jobsearch.com/archives/1800/%E3%83%8B%E3%83%81%E3%83%AC%E3%82%A4%E3%83%95%E3%83%BC%E3%82%BA%E6%9C%AC%E6%96%87%E7%94%BB%E5%83%8F>