<https://www.pennant-ips.com/services/training/simplified-technical-english-ste-training/ste-r4i-writer-with-ste/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.pennant-ips.com/services/training/simplified-technical-english-ste-training/ste-r4i-writer-with-ste/>