About: http://webisa.webdatacommons.org/91331230

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	In any case, the substrate is an optically transparent body--unless the lens is to be coated with a metal layer for use as a mirror, in which case the substrate need not be transparent.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com