<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ghk.h-cdn.co/assets/cm/15/11/768x516/54ff383ea709a-paper-trees-6-xln.jpg>
<http://www.goodhousekeeping.com/holidays/christmas-ideas/how-to/g952/mod-christmas-trees/>