<http://schema.org/keywords>
"S\u00EDmbolo, Simetr\u00EDa, Representaci\u00F3n, simbolos, logo, se\u00F1ales, escudo, normas"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.bibliocad.com/biblioteca/simbolo-de-simetria_44255>