About: http://webisa.webdatacommons.org/196810294

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Optical attenuation, if desired, can be achieved in said optical elements, for example, by the inclusion of pigments, dyes, and other light absorbing materials.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es