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RE: OWL 2 profiles

From: Michael Schneider <schneid@fzi.de>
Date: Tue, 23 Nov 2010 17:51:14 +0100
Message-ID: <0EF30CAA69519C4CB91D01481AEA06A00235B5C8@judith.fzi.de>
To: "Cristian Cocos" <cristi@ieee.org>
Cc: <public-owl-dev@w3.org>
Cristian Cocos wrote:

>1. Anybody care to tell me if OWL 2 EL and RL are syntactic fragments
>of OWL 2 DL please? 

Yes. 

But do not confuse the OWL 2 RL syntactic profile (which in fact is a
syntactic fragment of OWL 2 DL) with the OWL 2 RL/RDF rules, which is a
/semantic/ fragment of OWL 2 /Full/, and is defined for unrestricted RDF
graphs.

[snip]

>2. I need to explain very briefly the syntactic difference b/w OWL 2
>Full and OWL 2 DL--is there such a thing as "the most
>important/glaring difference" between the two?

The syntax of OWL 2 Full is the RDF abstract syntax [1], i.e. any RDF graph
is a valid OWL 2 Full ontology. To compare this with OWL 2 DL, one should
think in terms of "OWL 2 DL ontologies in RDF graph form". An RDF graph is
an OWL 2 DL ontology in RDF graph form, if it (a) can be successfully mapped
by the reverse OWL 2 RDF Mapping [2] and (b) if the resulting ontology in
the OWL 2 Structural Specification meets the restrictions on OWL 2 DL
ontologies as summarized at the beginning of Chap. 3 of [3]. In other words,
whenever this two-step checking fails for some given RDF graph, then you
have an example for an OWL 2 Full ontology that is not an OWL 2 DL ontology
(in RDF graph form).

>Many thanks,
>
>C

Best,
Michael

[1] <http://www.w3.org/TR/2004/REC-rdf-concepts-20040210/>
[2] <http://www.w3.org/TR/2009/REC-owl2-mapping-to-rdf-20091027/>
[3] <http://www.w3.org/TR/2009/REC-owl2-syntax-20091027/>

--
Dipl.-Inform. Michael Schneider
Research Scientist, Information Process Engineering (IPE)
Tel  : +49-721-9654-726
Fax  : +49-721-9654-727
Email: michael.schneider@fzi.de
WWW  : http://www.fzi.de/michael.schneider
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Received on Tuesday, 23 November 2010 16:51:53 GMT

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