About: http://webisa.webdatacommons.org/1351489

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	Use separate codes to distinguish cases where information was not applicable from other types of missing data such as do not know or refused to answer.
http://www.w3.org/ns/prov#wasQuotedFrom	umich.edu