About: http://webisa.webdatacommons.org/58235117

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	If the date is a last day-of-the-month, the result will also be a last-day-of-the-month (ie date(2001-Feb-28) + years(3) -> 2004-Feb-29). years_duration construct/copy/destruct
http://www.w3.org/ns/prov#wasQuotedFrom	boost.org