[Crm-sig] Domain and range of P90

Christian-Emil Smith Ore c.e.s.ore at iln.uio.no
Wed Feb 28 15:24:59 EET 2018



From: Crm-sig <crm-sig-bounces at ics.forth.gr> on behalf of Martin Doerr <martin at ics.forth.gr>
Sent: 28 February 2018 11:38
To: crm-sig at ics.forth.gr
Subject: Re: [Crm-sig] Domain and range of P90

Dear All,

I'd like to remind you that RDF-OWL is only a historical phenomenon in the history of knowledge representation.
The CRM needs to define semantics that cover E-R, TELOS, KL-One, KIF, OIL, DAML-OIL, DL, RDFS, XML, Jason, and whatever will come up. Therefore we define it in FOL.

The puzzling gap to primitive values has on one side to do with hardware, which cannot cover infinite mathematical spaces. Consequently, each machine and encoding convention uses a different subset.

The other difference is deeper: On the machine, you can only use identifiers to talk about things. Digital objects themselves can be in the machine, but not necessarily are, and all others cannot. This causes a semantic gap which is common to all database schemata, and needs to be resolved by a series of practical conventions separately for each datamodel. It can only be resolved by having an ontology, which in the first place makes the distinction, so that it becomes clear, what each database schema describes about the world and what description is.

I hope this makes things theoretically clearer: The puzzle is what is information itself.



On 2/28/2018 10:39 AM, Conal Tuohy wrote:
I have used rdf:value for this purpose. https://www.w3.org/TR/rdf-schema/#ch_value

The CRM's origin was outside of the RDF space, and it is still considered to be something more abstract than any concrete expression in RDFS or OWL. This is why, I think, there remains a puzzling gap between RDF resources which are instances of CRM classes and their literal values which must be expressed using primitive RDF data types. The point of rdf:value, as I understand it, is to fill in gaps like these.

On 22 February 2018 at 02:04, Carlisle, Philip <Philip.Carlisle at historicengland.org.uk<mailto:Philip.Carlisle at historicengland.org.uk>> wrote:
Dear all,
Naïve question.

Is there any reason why P90 has value could not/should not change its domain and range from:

Domain:                        Range
E54 Dimension              E60 Number


E1 CRM Entity              E59 Primitive Value

I look forward to you answers


Phil Carlisle
Knowledge Organization Specialist
Listing Group, Historic England
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Conal Tuohy

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