<https://develop.techcrunch.com/2009/10/09/google-squared-gets-better-but-it-still-cant-find-mars/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://develop.techcrunch.com/2009/10/09/google-squared-gets-better-but-it-still-cant-find-mars/>