[Crm-sig] [Fwd: CIDOC CRM in OWL 2]

Christian-Emil Ore c.e.s.ore at iln.uio.no
Tue Sep 8 12:32:09 EEST 2009


I agree with Martin. A warning or explanatory text should be added. One 
should keep in mind that the OWL-representation is in fact an 
implementation on the same level as any valid implementation in some 
well defined formalism.

Chr-Emil

On 07.09.2009 23:22, martin wrote:
> Simon Reinhardt wrote:
>> Yes, the primitive values are only listed as classes in there for 
>> completeness (since they appear as classes in the documentation). The 
>> properties using them are declared as datatype properties with a range 
>> of rdfs:Literal so usage of RDF literals is actually encouraged. I 
>> didn't want to define more exact ranges because for example xsd:dateTime 
>> is not an exact match for the time primitive because it can only hold 
>> one date, not describe a range of time.
>> If you think they are too confusing I can remove those classes.
> 
> Yes, better remove. The intention of "Primitive Value" was to describe that
> here in an implementation a "primitive value" representing number/string/time
> should appear. Since there is no common abstraction for these in our databases,
> we could not describe them differently in the CRM.
> 
> E.g., "Number" could be integer, double, float, complex, intervals, or any array or matrix of
> numbers.
> 
> I think we should add in the CRM text a warning not to model these as classes.
> 
> Best,
> 
> Martin
>> Regards,
>>  Simon
>>
>> martin wrote:
>>> Dear Simon,
>>>
>>> Thank you verry much for your contribution!
>>>
>>>
>>> I'd however prefer not to model the Primitive Values as classes,
>>> because this causes another indirection that
>>> hits heavily on query performance. Direct use of RDF literal
>>> for any primitive value is one choice.
>>>
>>> Best,
>>>
>>> Martin
>>>
>>> -------- Original Message --------
>>> Subject: CIDOC CRM in OWL 2
>>> Date: Mon, 07 Sep 2009 14:35:17 +0200
>>> From: Simon Reinhardt <simon.reinhardt at koeln.de>
>>> To: martin at ics.forth.gr
>>>
>>> Hello,
>>>
>>> I created a new representation of the CIDOC CRM in OWL. The details 
>>> about this can be found on 
>>> <http://bloody-byte.net/rdf/cidoc-crm/index.html>.
>>> However just quickly summarising it:
>>> The existing OWL implementation did not meet my satsifaction. The OWL 
>>> file is being served with the wrong content type (can be fixed easily 
>>> though). The URIs used for the terms are relative to the document and 
>>> therefore depend on the hosting server and change with every version 
>>> which makes them rather unsuitable for a Linked Data context. Also the 
>>> way the URIs are constructed (with dots) is problematic in various RDF 
>>> syntaxes. Apart from that new OWL 2 constructs like property chains 
>>> lent themselves rather nicely for implementing the model so I felt I 
>>> might as well create my own ontology. The result of this is available 
>>> in the Turtle and RDF/XML formats and valid within OWL 2 DL.
>>>
>>> I think I cannot post to your mailing list since it's members only but 
>>> if you want to forward my email there for discussion I'm fine with that!
>>>
>>> Looking forward to your feedback,
>>>  Simon
>>>
>>>
>>
> 
> 



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