About: http://webisa.webdatacommons.org/118941350

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	The spacer layer 42 is substantially transparent at the wavelengths of the recording and readout light beams and is formed of a material such as an oxide of silicon, titanium or aluminum.
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr