About: http://webisa.webdatacommons.org/158317349

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	If VDATA, then the message contains either a key or delta frame. If VCNTL, then the message is a control message. Control types and messages are defined by bits 2,3:
http://www.w3.org/ns/prov#wasQuotedFrom	docstoc.com