About: http://webisa.webdatacommons.org/81863517

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	Anyway I think that usually the user name should not change, for what that I can see also other systems let you change the email and any other informations but the name cannot be changed.
http://www.w3.org/ns/prov#wasQuotedFrom	codeproject.com