About: http://webisa.webdatacommons.org/269148141

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	no, you not should delete them by hand there is a command to remove them, if delete them mysql would crash. the command is:
http://www.w3.org/ns/prov#wasQuotedFrom	serverfault.com