About: http://webisa.webdatacommons.org/296971232

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	This video will show you situations where they can be useful, including transforming multiple layers with a single control layer and using nulls to automatically control orbital animations with cameras.
http://www.w3.org/ns/prov#wasQuotedFrom	video2brain.com