About: http://webisa.webdatacommons.org/447328017

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 OLE. standard illuminant A. The sensing head can be of a shape, e.g. a hemi- I sphere, which fits over the sample to be tested so as to exclude extraneous light.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com