About: http://webisa.webdatacommons.org/434528397

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	To be consistent you would have to add new methods to Phobos and other libraries to return Option (e.g., for the map class and others).
http://www.w3.org/ns/prov#wasQuotedFrom	digitalmars.com