About: http://webisa.webdatacommons.org/180565127

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	That was the whole point of the original post!) And yes, I did try your example with what I gave, and it does work (though in the code I originally posted there was a typo).
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com