<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/640x320/54cad54b5799c_-_hyhw-fireplace-01-1211-de.jpg>
<http://www.popularmechanics.com/home/interior-projects/how-to/a7385/how-your-house-works-fireplace/>