<http://schema.org/keywords>
"Bleachers, bleachers, grandstands sports, roof, mezzanine, slab, stair, reservoir, Mezzanine, Dach, Treppe, Platte, mezzanine, toiture, escaliers, dalle, mezanino, telhado, escadas, lajes"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.bibliocad.com/library/details-grandstands-sports_65573>