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Re: OWL Lite's restrictions on the use of the OWL vocabulary

From: Yuzhong Qu <yzqu@seu.edu.cn>
Date: Mon, 31 Mar 2003 14:22:50 +0800
Message-ID: <007d01c2f74d$f4b5e8e0$9c0b77ca@xobjects>
To: "Peter F. Patel-Schneider" <pfps@research.bell-labs.com>
Cc: <www-rdf-logic@w3.org>

> > 8.3 OWL Lite [ In OWL Reference] says:
> > 
> > 1. Class axioms with an owl:equivalentClass statement. In these axioms both
> > the domain and range should be either a class identifier or a property
> > restriction.
> > 
> > 2. In value restrictions, only owl:allValuesFrom and owl:someValuesFrom may
> > be used.(not explicitly state whether or not property-restriction type can
> > be used )
> > 
> > 3. Only class descriptions of the class-identifier and property-restriction
> > type are allowed at the righthand-side of domain and range statements for
> > object properties.
> > 
> > 
> > However. 2.3.1. OWL Lite Axioms [In OWL Abstract Syntax and Semantics]
> > says:
> > 
> > A. axiom ::= 'EquivalentClasses(' classID { classID } ')'
> > 
> >     It means that only a class identifier can be the domain and range of an
> > owl:equivalentClass statement.

> owl:equivalentClass triples can arise from other parts of the abstract
> syntax, so your claim does not follow from this.

It seems that the another part of the abstract syntax is as follows:

axiom ::= 'Class(' classID modality { annotation } { super } ')'
modality ::= 'complete' | 'partial'
super ::= classID | restriction

Yes, it allows the range be either a class identifier or a property
restriction.

How about the domain of an owl:equivalentClass statement (OWL Lite)?  

Just classID ?  or 

classID plus restriction (as in  1/ above)?

BTW,  Is the modality in OWL DL [2.3.2.1. OWL DL Class Axioms]

same as the modality in OWL DL [2.3.1.1. OWL Lite Class Axioms]?


> > B. restriction ::= ...| 'restriction(' individualvaluedPropertyID 
> >                         { 'allValuesFrom(' classID ')'}
> >                         { 'someValuesFrom(' classID ')' } ... ')'
> >     
> >     It means that only a class identifier can be used for owl:allValuesFrom
> > and owl:someValuesFrom constructs.
> 
> Yes, but this is not what 2/ above says.

Thanks for your clarification.

> > C. axiom ::= 'ObjectProperty(' individualvaluedPropertyID { annotation } {
> > 'super(' individualvaluedPropertyID ')'}
> >               { 'domain(' classID ')'} { 'range(' classID ')' }  ... ')'
> > 
> >     It means that only a class identifier can be allowed at the
> > righthand-side of domain and range statements for object properties.
> 
> Agreed.

Thanks again!

> > Which one is the correct statement about the OWL Lite's restrictions on the
> > use of the OWL vocabulary?
> 
> Well that is a good question.  As the editor of the S&AS document, I would
> say that this document should be definitive.
> 
> > Yuzhong Qu
> 
> peter
>  

Yuzhong Qu
Received on Monday, 31 March 2003 01:21:57 GMT

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