- From: Bijan Parsia <bparsia@cs.man.ac.uk>
- Date: Fri, 7 Mar 2008 17:07:56 +0000
- To: "Web Ontology Language ((OWL)) Working Group WG" <public-owl-wg@w3.org>
On 7 Mar 2008, at 16:36, Achille Fokoue wrote: > Hi, > > Another rationale for giving up property functionality in favor of > property inclusion is that some of the E/R constructs missing in DL- > LiteR (e.g. key and uniqueness constraints) are generally used in > the database world to express constraints rather than enabling > inferencing. So, adding them to DL-LiteR will not only affect > performance, it might also not correspond to the user's intuition > or expectation (i.e. a constraint that has to be checked, and if > it is not violated, then query answering can be performed ignoring > it). Good point! In fact, it would be pretty easy to delegate that to the underlying database in a smooth way. One could annotate certain properties and then separate the constraint checking from the query answering. Cheers, Bijan.
Received on Friday, 7 March 2008 17:06:02 UTC