<https://www.emptywheel.net/2013/12/30/how-nsa-hunts-metadata-content-in-search-of-your-digital-tracks/#breadcrumb>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://www.emptywheel.net/2013/12/30/how-nsa-hunts-metadata-content-in-search-of-your-digital-tracks/>