Response to IH

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Dear RIF WG,

The current SWC document uses the terms 'OWL Full Semantics' and 'OWL  
DL Semantics'. However, the OWL Working Group, in the recently  
published OWL 2 Recommendation, has tried to clarify these notions by  
separating syntax and semantics. In OWL 2, it is made clear that OWL 2  
DL is a syntactic restriction and not, per se, a definition of a  
particular semantics. For semantics, we refer to the 'OWL 2 Direct  
Semantics' and 'OWL 2 RDF-Based Semantics', either of which could be  
applied to an OWL 2 DL ontology.

We realise that this may come a bit too late in the process (and the  
OWL WG also acknowledges the issue of accepted terminology, see the  
thread at[1]). However, we wonder whether the RIF WG would still  
consider updating the RDF and OWL Compatibility document to reflect  
the terminology used in OWL 2 -- we believe that there would be a  
benefit to RIF in terms of increased clarity and consistency with the  
latest version of OWL.

Note that the current discussion on the Semantic Web Coordination Group 
[2] that will provide generic URI-s for entailment regimes (and which  
may be an alternative to the URI-s listed in 5.1.1. of the document)  
will probably reflect the updated terminology.


On behalf of the OWL Working Group

Ian Horrocks, Chair