<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://digitalspyuk.cdnds.net/12/26/160x240/gallery_gaming_half_life_2_concept_art_4.jpg>
<http://www.digitalspy.com/gaming/news/g9629/gaming-half-life-2-episode-3-alleged-concept-art/>