<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://toc.h-cdn.co/assets/14/37/980x490/540f8b0c90e43_-_tcx-01-dupont-family-0513-lg.jpg>
<http://www.townandcountrymag.com/society/g208/most-enduring-families/>