About: http://webisa.webdatacommons.org/451478088

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	On the other hand there might be many subtleties and one can proceed on the case by case basis (see e.g. How do I work with Root objects? where one can simply count roots e.g. with Length).
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com