[LC Response] To Ralf Moeller Re: OWL2

Dear Ralf:

This message is in reply to your comment available as
<http://lists.w3.org/Archives/Public/public-owl-comments/2009Jan/0059.html>,
on the OWL 2 Web Ontology Language last call drafts; the initial
response from the working group
<http://lists.w3.org/Archives/Public/public-owl-comments/2009Feb/0031.html>;
and your subsequent reply, available as
<http://lists.w3.org/Archives/Public/public-owl-comments/2009Mar/0018.html>

The Working Group acknowledges that multi-valued data properties
together with datatype facets do pose an implementation burden. However,
the group is not chartered [1] to do any changes that would break 
backward compatibility with OWL 1, which had numerous implementations
with non-functional datatypes, as well as deployment of ontologies
possibly relying on that feature. Note also that no erratum was reported
on this feature on OWL 1 [2]. Therefore, the Working Group does not
intend to change OWL 2 in this way.

Regards,
Peter F. Patel-Schneider
on behalf of the W3C OWL Working Group

[1] http://www.w3.org/2007/06/OWLCharter.html
[2] http://www.w3.org/2001/sw/WebOnt/errata