About: http://webisa.webdatacommons.org/99983210

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	all.txt is a file in the same directory, so cat gets confused when it wants to write from the same file to the same file.
http://www.w3.org/ns/prov#wasQuotedFrom	superuser.com