Dear All,
Sorry for answering in pieces. The "ultima ratio" for all we do are the
queries, and not the entities. There are 9 possible questions about a
time-span: Give me all events that (1) must have happened before event X
started, that may have happened before event X started, that must have
happened before event X ended, that may have... etc. If the last second
of a day is included or not, is completely irrelevant for our purposes.
If the end of the end of 1895 is interpreted as Jan 1, 0:0, 1896, the
question is, how implementations will answer the above queries wrt 1896,
and not, if the last second is in or out. I'll try in the next weeks to
sort that out. I hope, different RDF databases will be consistent at least!
Best wishes and thank you for pointing to this issue!
On 5/8/2019 8:50 PM, Robert Sanderson 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
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
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