Dear Christian-Emil,
I am not sure this is a good idea. Moving time-span properties onto E2
just washes about the fact that the temporal projection of E2 and of E92
are equivalent. If we make the paths more dissimilar, we just hide that
there are two alternative ways to formulate it. If the formal rules of
KR do not foresee the case, we just change the cardinality of P4 / P160
to (1,1:0,n) or (1,1:0,2).
I am hesitating to propose a common superclass of E92 and E2 just to
have one domain for P4/P160. It becomes an extremely abstract thing.
Opinions?
Best,
Martin
On 3/19/2019 1:19 PM, Christian-Emil Smith Ore wrote:
Hi Dan, all
The recommended way to model historical periods is as instances of E4 Period.
This recommendation is older than the introduction of E92.
The current model with E2 Temporal Entity, E52 Time-Span and E92 STV is not
optimal and E92 is not the reason eventhough it is pretty abstract. In my
opinion, E52 Time-Span is redundant and can be replaced by E2 Temporal Entity
with an adjusted scope-note and change the domain of
P79 beginning is qualified by: E62 String
P80 end is qualified by: E62 String
P81 ongoing throughout: E61 Time Primitive
P82 at some time within: E61 Time Primitive
P83 had at least duration (was minimum duration of): E54 Dimension
P84 had at most duration (was maximum duration of): E54 Dimension
P160 has temporal projection
P86 falls within (contains): E52 Time-Span can be replaced by P117 occurs
during (includes): E2 Temporal Entity
If E52 is removed the property P160 has temporal projection should be an
injection into E2 and have the cardinality (1,1:0,1)
(in any case: P78 is identified by (identifies) should be deprecated since E49
Time Appellation is already deprecated.)
See also
http://cidoc-crm.org/sites/default/files/issue%20326%20overview%20and%20thought.pptx
for a graphical overview.
Best,
Christian-Emil
********
E2 Temporal Entity:
This class comprises all phenomena, such as the instances of E4 Periods, E5
Events and states, which happen over a limited extent in time. This extent in
time must be contiguous, i.e., without gaps. In case the defining kinds of
phenomena for an instance of E2 Temporal Entity cease to happen, and occur
later again at another time, we regard that the former E2 Temporal Entity has
ended and a new instance has come into existence. In more intuitive terms, the
same event cannot happen twice.
In some contexts, these are also called perdurants. This class is disjoint from
E77 Persistent Item. This is an abstract class and has no direct instances. E2
Temporal Entity is specialized into E4 Period, which applies to a particular
geographic area (defined with a greater or lesser degree of precision), and E3
Condition State, which applies to instances of E18 Physical Thing.
*********
E52 Time-span
This class comprises abstract temporal extents, in the sense of Galilean
physics, having a beginning, an end and a duration.
Time Span has no other semantic connotations. Time-Spans are used to define the
temporal extent of instances of E4 Period, E5 Event and any other phenomena
valid for a certain time. An E52 Time-Span may be identified by one or more
instances of E49 Time Appellation.
Since our knowledge of history is imperfect, instances of E52 Time-Span can
best be considered as approximations of the actual Time-Spans of temporal
entities. The properties of E52 Time-Span are intended to allow these
approximations to be expressed precisely. An extreme case of approximation,
might, for example, define an E52 Time-Span having unknown beginning, end and
duration. Used as a common E52 Time-Span for two events, it would nevertheless
define them as being simultaneous, even if nothing else was known.
Automatic processing and querying of instances of E52 Time-Span is facilitated
if data can be parsed into an E61 Time Primitive.
*********
________________________________________
From: Crm-sig <[email protected]> on behalf of Dan Matei
<[email protected]>
Sent: 19 March 2019 09:27
To: [email protected]
Subject: Re: [Crm-sig] Space time volumes
Hi fiends,
On Mon, 18 Mar 2019 at 19:20, Martin Doerr <[email protected]> wrote:
Nevertheless, we used the term informally in the CRM. We could name E92 as
"abstract".
For me, some E92 are not abstract. E.g. I instantiate "Byzantine
Period" (it is somwhat difficult to place it in South America :-) :
<#ByzantinePeriod> <isA> <crm:E92_Spacetime_Volume>
<#ByzantinePeriod> <crm:P160_has_temporal_projection> <330-1700>
<#ByzantinePeriod> <crm:P161_has_spatial_projection> <#EsternEurope>
<#ByzantinePeriod> <crm:P161_has_spatial_projection> <#Levant>
<#ByzantinePeriod> <crm:P161_has_spatial_projection> <#NorthAfrica>
Also:
<#BronzeAge1> <isA> <crm:E92_Spacetime_Volume>
<#BronzeAge1> <crm:P2 has_type> <#BronzeAge-Concept>
<#BronzeAge1> <crm:P160_has_temporal_projection> <p?1>
<#BronzeAge1><crm:P161_has_spatial_projection> <#JapaneseIslands>
<#BronzeAge2> <isA> <crm:E92_Spacetime_Volume>
<#BronzeAge2> <crm:P2 has_type> <#BronzeAge-Concept>
<#BronzeAge2> <crm:P160_has_temporal_projection> <p?2>
<#BronzeAge2><crm:P161_has_spatial_projection> <#Scandinavia>
Should I worry ?
Dan
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--
------------------------------------
Dr. Martin Doerr
Honorary Head of the
Center for Cultural Informatics
Information Systems Laboratory
Institute of Computer Science
Foundation for Research and Technology - Hellas (FORTH)
N.Plastira 100, Vassilika Vouton,
GR70013 Heraklion,Crete,Greece
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Email: [email protected]
Web-site: http://www.ics.forth.gr/isl
