About: http://webisa.webdatacommons.org/48974367

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 suspect that this is a more general issue (\isin checks whether strings are substrings of other strings; it probably fails because the parameter is a number) but I can not find material on this.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com