About: http://webisa.webdatacommons.org/186781796

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	other words, a leaf is a vertex, other than the root, which has exactly one
http://www.w3.org/ns/prov#wasQuotedFrom	slideshare.net