About: http://webisa.webdatacommons.org/107577204

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	Not only do they compress the messages and other documents, but they only store attachments and other material once, instead of on every user's system.
http://www.w3.org/ns/prov#wasQuotedFrom	techtarget.com