<https://www.ihaveapc.com/tag/extract-text-from-pdf-files-in-linux-mintubuntu/#breadcrumb>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://schema.org/BreadcrumbList>
<https://www.ihaveapc.com/tag/extract-text-from-pdf-files-in-linux-mintubuntu/>