About: http://webisa.webdatacommons.org/340458594

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	I can not reproduce your problem, i.e. the following compiles fine (at least with eclipse):
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com