Dear Robert,
Yes, this is up to the point. An example for E93 would be nice:
typically, some reported situations, such as a museum object having been
in display case xxx at least for this time-span, etc.
Another important case are the declarative STVs (CRMgeo) we need in
great number for approximating "places", such as "Rome (city)" or
"Poland(state)" in gazetteers, typically by outer bounds. (Franco
Niccolucci and Sorin Hermon propose smaller STV boxes filling up "places").
There are enough high-level classes that need not normally be
instantiated, but axiomatizing them as "abstract classes", as semantic
network models in the 1980'ies proposed, appeared in the end to be
misleading, because it fixes a level of specificity which does not
exists for a general ontology as the CRM. In a way, the specificity of
any class is arbitrary, because an instance has much more
characteristics than any class we use. For instance, if we are
interested in genotypes, the class "Person" becomes completely abstract.
On the other side, in an Open World, any "abstract class" may have a
direct instance, because the respective subclass has not been formulated
in this ontology.
Nevertheless, we used the term informally in the CRM. We could name E92
as "abstract".
Best,
Martin
On 3/18/2019 6:19 PM, Robert Sanderson wrote:
Thank you Martin!
If I can try to summarize my understanding, …
A physical object isA space time volume that has a temporal projection
that is equal to the time span between its beginning of existence and
its end of existence.
A period isA space time volume that has a temporal projection that is
equal to the timespan of the temporal entity (and hence the FOL
equivalency)
An arbitrary temporal slice of a STV (be it physical or temporal) that
does not need to obey these restrictions is a E93 Presence
Space Time Volumes themselves seem never to need to be instantiated,
instead one would use a subclass, as above.
In the 6.2.4 documentation, the Examples for E92 do not give sub-classes.
The STV of the Event of Caesar’s murder seems like either an E7
Activity (the murdering)
The STV of the carbon 14 dating also seems like an E7 Activity (or
attribute assignment, depending on modeling?)
The HMS victory from construction through to current location seems
like a E22 Man-Made Object
The Danube river flood seems like an E5 Event
Having examples for E93 Presence would be valuable.
Rob
*From: *Martin Doerr <[email protected]>
*Date: *Thursday, March 14, 2019 at 12:40 PM
*To: *Robert Sanderson <[email protected]>, "[email protected]"
<[email protected]>
*Subject: *Re: [Crm-sig] Issue 326 Resolving inconsistencies between
E2, E4, E52 and E92
Dear Robert,
On 3/14/2019 7:23 PM, Robert Sanderson wrote:
Good point! I agree that the necessary condition of P98 means
that the Person-STV is impossible, as that temporal projection was
not, itself, born. Thus all STVs that are also Persons, must at
least include the temporal projection of the birth of the Person.
Yes, or, the birth projection overlaps with the person's STV, it
initiates it. The birth begins before, and ends after. The STV's
beginning falls within the birth.
So … it doesn’t work for Person p10i Person, but it could be
reduced to a higher level class that doesn’t have such an identity
condition. For example, for some time I had a phase in which I was
183 centimeters tall:
Person p10i [
a E18_Physical_Object ;
P43_has_dimension [
a E54_Dimension
P90_has_value 183 ;
P91_has_unit <centimeters> ]
P160_has_temporal_projection [
a E52_Time-Span ;
…
]
Well, we have a beginning of existence for all E18 instances
corresponding to birth. Obviously, these are natural conditions to be
added, and important reasoning components to be developed for the CRM.
Nothing to do with the IsA versus link problem, isn't it?
Regardless if we define a STV for it, we should know what makes things
to begin to exist and end to exist.
So, I believe, for the respective phase, we still need to know how it
comes into being. If it is arbitrary, then we have the "Presence"
class already, which defines an arbitrary temporal section through the
STV. If not, we need some other class.
Best,
Martin
Rob
--
------------------------------------
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
Vox:+30(2810)391625
Email:[email protected] <mailto:[email protected]>
Web-site:http://www.ics.forth.gr/isl
--
------------------------------------
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
Vox:+30(2810)391625
Email: [email protected]
Web-site: http://www.ics.forth.gr/isl
