About: http://webisa.webdatacommons.org/345864212

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	A tree is a graph with no closed loops: In a family tree, for instance, a closed loop would indicate something biologically impossible ??? that, say, someone is both parent and sibling to the same person.
http://www.w3.org/ns/prov#wasQuotedFrom	mit.edu