<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://wdy.h-cdn.co/assets/cm/15/09/160x213/54eb891cdd7bc_-_build-a-database-mdn.jpg>
<http://www.womansday.com/life/how-to/g383/how-to-trace-your-family-tree-1537/>