<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/54cad54d5fe04_-_hyhw-fireplace-04a-1211-de.jpg>
<http://www.popularmechanics.com/home/interior-projects/how-to/a7385/how-your-house-works-fireplace/>