About: http://webisa.webdatacommons.org/228286688

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	In this case that is already true, i.e. the Customer.CustomerId is a primary key (indicated by the yellow key next to the field in the diagram).
http://www.w3.org/ns/prov#wasQuotedFrom	sqlservercentral.com