<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://schema.org/BreadcrumbList>
<https://pt.scribd.com/doc/45814003/TFC-Relacoes-Metricas-no-Triangulo-Retangulo-Problematizacao-Contextualizacao-e-Aplicacoes>