PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • ??? In order to clarify the meaning of dates entered as double years, that is, years previously entered and displayed for example as 1851/1859, the following changes have been made: if double years are more than a year apart and no month appears, such as in 1851/9, the event is assumed to fall within that range of years ??? in this example as between 1851 and 1859 inclusively.
http://www.w3.org/ns/prov#wasQuotedFrom
  • geneanet.org