<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/640x400/54cb160e835c8_-_sketch-up-02-0713-de.jpg>
<http://www.popularmechanics.com/technology/a9160/model-your-renovation-in-3d-with-sketchup-make-15682589/>