<https://forum.monetize.info/topic/325906-what-is-the-limit-of-a-robottxt-file/#comment-852198>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://forum.monetize.info/topic/325906-what-is-the-limit-of-a-robottxt-file/>