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RE: (Object|Data)Property axioms missing in semantics document

From: Michael Schneider <schneid@fzi.de>
Date: Thu, 18 Oct 2007 13:06:28 +0200
Message-ID: <0EF30CAA69519C4CB91D01481AEA06A04A84E6@judith.fzi.de>
To: "Boris Motik" <boris.motik@comlab.ox.ac.uk>
Cc: "Owl Dev" <public-owl-dev@w3.org>

Hi, Boris!

Thanks for the clarification! This is approximately what I had suspected.

My last mail was actually more on practical issues, i.e. on making the
document more "user friendly". So I suggest: Wouldn't it be a good idea to
include your explanation below in the document as some kind of an
"informative" statement? This would hopefully satisfy readers which are not
so perfectly familiar with model theoretic semantics. (And it would
hopefully avoid them from annoying you by asking my previous question again
and again. ;-))

Cheers,
Michael

Boris Motik wrote:

>Hello,
>
>In the semantics document, you will not find the definitions 
>of the interpretation of the ObjectProperty(P), DataProperty(P),
>OWLClass(C), and Individual(I) in any table, and this is 
>intended. Object and data properties, classes, and individuals 
>are the base
>symbols and you can interpret them arbitrarily. That is, you 
>define an interpretation by (arbitrarily) choosing the interpretation
>of the base symbols. This is mentioned in the document 
>immediately before Table 1.
>
>Once you have chosen the interpretation of the basic symbols, 
>you have to extend it to complex constructors; in doing so you need to
>follow certain rules. Tables 1 to 3 define these rules, i.e., 
>how to extend the interpretation of the basic symbols to more complex
>ones.
>
>Finally, Table 4 has a slightly different purpose: it defines 
>which interpretations are models.
>
>I hope that this classification helps somewhat.
>
>Sincerely,
>
>	Boris
>
>P.S.: Please note also that ObjectProperty(P) and 
>DataProperty(U) are not axioms.
>
>
>> -----Original Message-----
>> From: public-owl-dev-request@w3.org 
>[mailto:public-owl-dev-request@w3.org] On Behalf Of Michael
>> Schneider
>> Sent: 18 October 2007 10:05
>> To: Owl Dev
>> Subject: (Object|Data)Property axioms missing in semantics document
>> 
>> 
>> Hi!
>> 
>> The "Structural Specification and Functional-Style Syntax" document
>> 
>>   <http://www.webont.org/owl/1.1/owl_specification.html#4.1>
>> 
>> defines the functional syntax for the axioms
>> 
>>   * ObjectProperty(P)
>>   * DataProperty(U)
>> 
>> But in the "Model-Theoretic Semantics" document
>> 
>>   <http://www.webont.org/owl/1.1/semantics.html>
>> 
>> the different "functional syntax --> semantics" tables do not contain
>> explicit entries for these two axioms.
>> 
>> Is there a reason for this omission? I don't really know, 
>but perhaps, such
>> entries would be redundant, because the semantics of object 
>properties and
>> data properties are already discussed in chapter 2 ("Model-Theoretic
>> Semantics") of the same document, although without 
>mentioning the respective
>> functional style expressions.
>> 
>> >From a practical point of view I would appreciate to have 
>the two additional
>> entries in one of the tables, because I generally use the 
>tables in this
>> "semantics" document whenever I am uncertain about the 
>correct way to write
>> the different axioms. Yes, I know, this is not the intended 
>usage of this
>> document. :-) But otherwise I would have to go to the 
>"syntax" document and
>> follow the grammar rules there, what I regard to be pretty 
>inconvenient in
>> certain cases!
>> 
>> Cheers,
>> Michael
>> 
>> --
>> Dipl.-Inform. Michael Schneider
>> FZI Forschungszentrum Informatik Karlsruhe
>> Abtl. Information Process Engineering (IPE)
>> Tel  : +49-721-9654-726
>> Fax  : +49-721-9654-727
>> Email: Michael.Schneider@fzi.de
>> Web  : http://www.fzi.de/ipe/eng/mitarbeiter.php?id=555
>> 
>> FZI Forschungszentrum Informatik an der Universität Karlsruhe
>> Haid-und-Neu-Str. 10-14, D-76131 Karlsruhe
>> Tel.: +49-721-9654-0, Fax: +49-721-9654-959
>> Stiftung des bürgerlichen Rechts
>> Az: 14-0563.1 Regierungspräsidium Karlsruhe
>> Vorstand: Rüdiger Dillmann, Michael Flor, Jivka Ovtcharova, 
>Rudi Studer
>> Vorsitzender des Kuratoriums: Ministerialdirigent Günther Leßnerkraus
>
>
>

--
Dipl.-Inform. Michael Schneider
FZI Forschungszentrum Informatik Karlsruhe
Abtl. Information Process Engineering (IPE)
Tel  : +49-721-9654-726
Fax  : +49-721-9654-727
Email: Michael.Schneider@fzi.de
Web  : http://www.fzi.de/ipe/eng/mitarbeiter.php?id=555

FZI Forschungszentrum Informatik an der Universität Karlsruhe
Haid-und-Neu-Str. 10-14, D-76131 Karlsruhe
Tel.: +49-721-9654-0, Fax: +49-721-9654-959
Stiftung des bürgerlichen Rechts
Az: 14-0563.1 Regierungspräsidium Karlsruhe
Vorstand: Rüdiger Dillmann, Michael Flor, Jivka Ovtcharova, Rudi Studer
Vorsitzender des Kuratoriums: Ministerialdirigent Günther Leßnerkraus
Received on Thursday, 18 October 2007 11:06:47 GMT

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