<https://hshambaravi.ee/2020/09/24/mis-on-juureravi-ja-mida-sellest-oodata/hambajuur/#breadcrumblist>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://hshambaravi.ee/2020/09/24/mis-on-juureravi-ja-mida-sellest-oodata/hambajuur/>