Dear Rob, Not having read the guidelines as attentively as you I usually implement P82a/b suggesting that the begin and end date are both included in the range.
For example, here's the date related to a book published in 1586: http://sphaera.mpiwg-berlin.mpg.de/id/item/7e241bb5-41e3-4e08-9ab1-547a93fe6b3d/publication/date <http://sphaera.mpiwg-berlin.mpg.de/id/item/7e241bb5-41e3-4e08-9ab1-547a93fe6b3d/publication/date> I think this is readable as a confidence interval of the book having been published somewhen in 1586, lacking better ways to express the level of accuracy in date datatypes. Best, Florian > On 8. May 2019, at 19:50, Robert Sanderson <rsander...@getty.edu> wrote: > > > Dear all, > > I admit I made the rookie mistake of assuming that the P81a/b and P82a/b > properties followed the typical temporal pattern of an inclusive beginning > and an exclusive end. > Or using interval notation: [begin_of_the_begin, end_of_the_end) > > Thus if you know that an event happened sometime in 1586, the begin of the > begin would be 1586-01-01T00:00:00 and the end of the end would be > 1587-01-01:00:00:00. > > However, http://www.cidoc-crm.org/guidelines-for-using-p82a-p82b-p81a-p81b > <http://www.cidoc-crm.org/guidelines-for-using-p82a-p82b-p81a-p81b> seems to > clarify that both are exclusive. > > > "P82a_begin_of_the_begin" should be instantiated as the latest point in > > time the user is sure that the respective temporal phenomenon is indeed > > *not yet* happening. > > "P82b_end_of_the_end" should be instantiated as the earliest point in time > > the user is sure that the respective temporal phenomenon is indeed *no > > longer* ongoing. > > And thus (begin_of_the_begin, end_of_the_end) > > Meaning that the begin of the begin would need to be 1585-12-31T23:59:59 such > that midnight on January first is included in the range, and the end of the > end would be midnight of January first, 1587. > > However, in the following paragraph it says: > > > … e.g. 1971 = Jan 1 1971 0:00:00. Respectively, for “P82b_end_of_the_end” > > the implementation should “round it up”, e.g. 1971 = Dec 31 1971 23:59:59. > > Which would mean that both ends were *included* in the range. > And thus [begin_of_the_begin, end_of_the_end] > > So … > > Enquiring minds that need to implement this consistently would like to know > which is correct ☺ > > > Many thanks! > > Rob > > > > > _______________________________________________ > Crm-sig mailing list > Crm-sig@ics.forth.gr <mailto:Crm-sig@ics.forth.gr> > http://lists.ics.forth.gr/mailman/listinfo/crm-sig > <http://lists.ics.forth.gr/mailman/listinfo/crm-sig>
