<http://schema.org/mentions>
"Ben Blundell, Civic Affair, Dustin Henry, Jake Kuzyk, Keith Henry, Mike Campbell, proof sheet, Russ Milligan, Skylar Kehr, Tyler Warren"^^<http://www.w3.org/2001/XMLSchema#string>
<http://skateboarding.transworld.net/photos/proof-sheet-keith-henry/>