About: http://webisa.webdatacommons.org/168409487

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	Since 2003 lacked content types, I used an external tool to populate the appropriate columns, depending on whether the item was a document or email.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com