About: http://webisa.webdatacommons.org/19900388

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	By that, one_or_two may be called with any number of arguments and the token __VA_ARGS__ in the definition is replaced by the arguments, including the commas between them.
http://www.w3.org/ns/prov#wasQuotedFrom	wordpress.com