About: http://webisa.webdatacommons.org/3758488

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	Also, since services are singletons, I think it would be difficult to use that approach, especially if there were multiple instances of this tri-stated checkbox in the app... the service would need to keep track of them all somehow.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com