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Further to this, I have just reminded myself of the existence of a consistent (because program-generated) set of unique persistent identifiers for any date, down to the day level, AD or BC, using ISO 8601 notation (which means that it shares the limitations of ISO 8601 as regards BC dates). It can be found at: http://psi.semagia.com/iso8601/ These identifiers were produced with Topic Maps in mind, but could equally be used in a Linked Data setting. Richard **************************************************************** For mcg information visit the mcg website at http://www.museumscomputergroup.org.uk To manage your subscription to this email list visit http://www.museumscomputergroup.org.uk/email.shtml ****************************************************************