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LC Responses/MS7
| It's late in the day, I know, but I thought we needed a power of two - so here's LC comment No. 64. ;-)
I just stumbled over this: In the Conformance document, the definition of an "OWL 2 DL Ontology Document" is as follows: [[ An OWL 2 Full ontology document is an OWL 2 DL ontology document iff it can be successfully parsed using the procedure for mapping from RDF graphs to the structural specification described in the OWL 2 Mapping to RDF Graphs [OWL 2 Mapping to RDF Graphs]. ]] What I am missing: Does this already include the global constraints, such as "no cardinality restriction on transitive properties" or "tree of anonymous individual names", etc.? At least, I wasn't able to find this mentioned in the Mapping document. For the remaining languages (syntactic conformance of EL, QL, RL), I think the situation is fine, because the definitions explicitly state that the result of the mapping process must adhere to the structural specification for the respective language, e.g.: [[ An OWL 2 DL ontology document is an OWL 2 EL ontology document iff the result of the procedure for mapping from RDF graphs to the structural specification described in the OWL 2 Mapping to RDF Graphs [OWL 2 Mapping to RDF Graphs] --> is an OWL 2 EL ontology --> as defined in the OWL 2 Profiles specification [OWL 2 Profiles]. ]] So I think, saying something along the lines of the following text should save the day for OWL 2 DL, either: [[ An OWL 2 Full ontology document is an OWL 2 DL ontology document iff ... and if the result of this mapping process matches all the syntactic restrictions as defined in the OWL 2 Structural Specification [OWL 2 Specification]. ]] I would consider this a pure bug fix (no design change), because it is clear that an OWL 2 DL ontology has to meet all the global restrictions. |
To: Michael Schneider <schneid@fzi.de>
CC: public-owl-comments@w3.org
Subject: [LC response] To Michael Schneider
Dear Michael,
Thank you for your comment
<http://lists.w3.org/Archives/Public/public-owl-wg/2009Feb/0256.html>
on the OWL 2 Web Ontology Language last call drafts.
Thank you for pointing out this problem. The Syntactic Conformance section of the Conformance and Test Cases document (see [1]) has been revised to be clearer in general and to rectify this error in particular -- it now explicitly refers to RDF/XML documents and says:
"An OWL 2 DL ontology document is an OWL 2 Full ontology document that can be successfully parsed using the canonical parsing process as defined in the OWL 2 Syntax specification [OWL 2 Specification] and the procedure for mapping from RDF graphs to the structural specification described in the OWL 2 Mapping to RDF Graphs [OWL 2 Mapping to RDF Graphs] to produce an instance of the OWL 2 ontology class satisfying all of the restrictions described in Section 3 of the OWL 2 Syntax specification [OWL 2 Specification]."
Note that in response to other last call comments Section 3 of the OWL 2 Syntax specification is being revised to ensure that it lists all the restrictions that apply to OWL DL ontology structures.
[1] http://www.w3.org/2007/OWL/wiki/Conformance_and_Test_Cases#Syntactic_Conformance
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Regards,
Ian Horrocks
on behalf of the W3C OWL Working Group
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