<http://schema.org/keywords>
"symbols, logo, signs, coat, standards, Symbole, Logos, Schilder, Wappen, Normen, symboles, des normes, logo, signes, manteau, s\u00EDmbolos, normas, logotipo, sinais, revestimento"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.bibliocad.com/library/north-several-symbols_32062>