<http://schema.org/keywords>
"mining, drilling, Bergbau, Bohr, l'exploitation mini\u00E8re, le forage, minera\u00E7\u00E3o, perfura\u00E7\u00E3o"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.bibliocad.com/library/industrial-pond_41757>