[Crm-sig] Help wanted - Understanding P120 versus P183

Robert Sanderson RSanderson at getty.edu
Wed Jul 17 22:23:59 EEST 2019


Many thanks for the explanation!  To make sure that I’ve understood …

P120 is only able to be used when the E52 Time-Span of the range and domain E2 Temporal Entities, has the same begin_of_the_begin as its end_of_the_begin, and begin_of_the_end and end_of_the_end.  Or in pure CRM terms, that the value of the E61 Time Primitive of the Time-Span’s P81 and P82 Time Primitives are identical.  Otherwise, the property P183 must be used instead.

Is that correct?

Rob




From: Crm-sig <crm-sig-bounces at ics.forth.gr> on behalf of Martin Doerr <martin at ics.forth.gr>
Date: Wednesday, July 17, 2019 at 12:04 PM
To: crm-sig <Crm-sig at ics.forth.gr>
Subject: Re: [Crm-sig] Help wanted - Understanding P120 versus P183


Dear Robert,

P120 belongs to Allen's logic, which is deprecated. Allen's logic assumes exact endpoints in time, whereas P183 makes the fuzzy zone explicit. As such, P120 only coincides with P183 if the fuzziness is zero. Therefore, P183 is more general than P120.

Following CRMgeo, only declarative time spans can have precise endpoints in time. In reality, they occur in plans, administrational decisions, artificial constraints of focus and queries.

Since Allen's terms are useful for archaeology, but not with exact endpoints in time, the respective terms should be reintroduced in CRMarcheo extended by fuzzy boundaries.

Indeed, transitivity was not mentioned explicitly and should be added in the scope note (issue!)

All the best,

Martin

On 7/15/2019 7:55 PM, Robert Sanderson wrote:

Dear all,

The diagrams in the newer temporal properties as to how temporal spans A and B relate are enormously useful in understanding the distinctions between them.

The question that we ran into was the distinction between P120 occurs before and P182 / P183, and which one to use. In particular, we could not distinguish between P120 and its super property, P183.
Both imply some minimal temporal gap between the end of the first and the beginning of the second. Both position the entities temporally in the same order. Perhaps more importantly, between P182 (End of A is less than or equal to the start of B) and P183 (End of A is less than start of B), it seems like there are no other possibilities?

Indeed, P183 corresponds to Allen’s {before}, as does P120. P183 does not directly assert that it is transitive, but the temporal logic makes it such.

If there is a difference, between the two, it would be lovely to understand. And a diagram would be very helpful in explaining that difference.  If there isn’t a difference, it seems that P183 could be deprecated in favor of the longer standing P120.


Many thanks!

Rob




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