About: http://webisa.webdatacommons.org/179982825

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	d is a property which allows (readonly) access to __d, but as Michael points out without needing storage for an extra variable, and it can be computed dynamically when getd() is called.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com