About: http://webisa.webdatacommons.org/147982577

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 mask 44 may be a fixed aperture 46 or electromechanical shutter, or, preferably, is a liquid crystal, binary, spatial light modulator or valve which is dynamically reconfigured under software control.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com