<http://schema.org/keywords>
"valve, pipe, screw, Ventil, Rohr, Schraub, robinet, le tuyau, vis, v\u00E1lvulas, tubos, parafusos"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.bibliocad.com/library/3d-cap-screw_26239>