- From: Birte Glimm <birte.glimm@comlab.ox.ac.uk>
- Date: Tue, 28 Dec 2010 14:14:24 +0100
- To: Umberto Straccia <umberto.straccia@isti.cnr.it>
- Cc: SPARQL Working Group <public-rdf-dawg@w3.org>, Guido Vetere <gvetere@it.ibm.com>, Axel Polleres <axel.polleres@deri.org>, Maurizio Lenzerini <lenzerini@dis.uniroma1.it>
[snip] > Dear Birte, > working towards conjunctive query entailment regime for OWL QL ontologies is > specific and may rise a question about what happens for other OWL profiles. > Now, wouldn't it not be just easier and reasonable to have > 1. an OWL 2 "LITE" Direct semantics regime, which is the one in the draft so > far (if you like so, you may omit the word "LITE") > 2. an OWL 2 "FULL" Direct semantics regime, which is the one we would like > to have and compliant with what is called (full) "Conjunctive Queries" ? I don't see the current regime as LITE since it is much more in the spirit of the original SPARQL-DL proposal, e.g., one can query for sub- or super classes of a class, for domains for a property, etc. All other regimes (RDF(S), D-Entailment, OWL RDF-Based, and RIF) are also not restricted to just conjunctive queries, but the name is not the real issue here anyway. I don't have anything against 2. in principle, but I personally don't have the resources to do more than I already did. A new regime involves, apart from writing the spec, also defining suitable test cases and having systems ready that are able to pass the test cases. We are already quite late in the process (just before last call) to start the work on another regime, but basic graph pattern matching remains an extension point and future standadisation rounds can add more regimes as required by applications. Since at least in this standadisation round basic graph patern matching extensions are a time permitting feature it all depends on the time and effort that working group members are willing to contribute in addition to the normal WG schedule. Birte > -Umberto Straccia > > > > > > > > --------------------------------------------------- > | Umberto Straccia, PhD | > | ISTI | > | Italian National Research Council | > | Via G. Moruzzi,1 | > | I-56124 Pisa (PI), ITALY | > | ------------------------------------------------ | > | WWW : http://www.straccia.info | > | E-mail: Umberto.Straccia@isti.cnr.it | > / ) Phone : +39.050.315 2894 (\ > / ) Fax : +39.050.315 3464 ( \ > _ ( (|___ ___________________________________________ ) )_ > (((\ \) / ) / ) / /))) > (\\\\ \_/ / \ \_/ ////) > \ / \ / > > \ _/ \_ / > -----/ /---------------------------------------------\ \-------- > / / \ \ > > > > -- Dr. Birte Glimm, Room 309 Computing Laboratory Parks Road Oxford OX1 3QD United Kingdom +44 (0)1865 283520
Received on Tuesday, 28 December 2010 13:14:53 UTC