About: http://webisa.webdatacommons.org/49160134

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	As used herein, the terms optical materials, optical substrates, and optical articles" refer to normally transparent or translucent materials such as glass and plastic, and articles made of such materials.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com.au