About: http://webisa.webdatacommons.org/164606262

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	Depends on how often and where you write those keywords. mut seems to be quite common and even in D I would not like 'reference' more than 'ref', especially since it is used in parameter lists.
http://www.w3.org/ns/prov#wasQuotedFrom	digitalmars.com