About: http://webisa.webdatacommons.org/182159679

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	However, if there is a requirement that you know the distinct number of customers who purchased the product within the year, you must retain the customer keys throughout any aggregated data.
http://www.w3.org/ns/prov#wasQuotedFrom	wordpress.com