<http://schema.org/keywords>
"aircraft, airplane, boeing, airbus, helicopters, Flugzeuge, Hubschrauber, Flugzeug, avion, h\u00E9licopt\u00E8re, avi\u00E3o, helic\u00F3ptero, transportation"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.bibliocad.com/library/space-shuttle_18539>