<https://blog.p2pfoundation.net/p2p-and-the-role-of-exclusion-i-beyond-the-tragedy-of-the-commons/2009/10/08#webpage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://blog.p2pfoundation.net/p2p-and-the-role-of-exclusion-i-beyond-the-tragedy-of-the-commons/2009/10/08>