About: http://webisa.webdatacommons.org/246335989

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 usual way to do this is to cache the information on a separate thread, and then call invalidateRect: on the areas that you need to draw, allowing your drawRect: method to do nothing except quickly draw and exit.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com