About: http://webisa.webdatacommons.org/292204412

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	And that lets you do such things as have category sensitive filters, and filters that generate responses (both of these things done in this sample).
http://www.w3.org/ns/prov#wasQuotedFrom	squeak.org