<https://pdfboks.com/i-am-martin-luther-king-jr-ordinary-people-change-the-world-pdf/#richSnippet>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://pdfboks.com/i-am-martin-luther-king-jr-ordinary-people-change-the-world-pdf/>