About: http://webisa.webdatacommons.org/402443399

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 an embodiment of the illumination system, at least one of the transparent layers is a birefringent uniaxial layer having a birefringent symmetry axis arranged substantially parallel to the light-exit window.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com