Re: draft response for LC comment 8 MS2

[Draft Response for LC Comment 8:] MS2

Dear Michael,

Thank you for your message
  <http://lists.w3.org/Archives/Public/public-owl-comments/2009Jan/0006.html>
on the OWL 2 Web Ontology Language last call drafts.

As far as the Direct Semantics of OWL 2 is concerned, a facet value
could be any syntactic entity, thus the wording "arbitrary object".  One
could have a facet on integers called
ex:greaterThanNumberOfOneBitsInUTF16Encoding, which takes arbitrary
strings as values (e.g., the 12-character string "5"^^xsd:int) and picks
out those integers that were greater than the number of one bits in the
UTF-16 encoding of the string.  One could also have a facet on decimal
called ex:belongsToXSDDataType, which takes names of XSD data types
derived from decimal as values (e.g., int) and picks out those values
that belong to the value space of the XSD data type.  

One could even have a facet that takes arbitrary IRIs as values or even
blank node identifiers.  However, a datatype map can only depend on the
syntactic form of these facet values, not any of their properties in an
ontology.

The OWL 2 Functional Syntax restricts facet values to be literals, and
all the OWL 2 facets only depend on the data value that the literal
corresponds to.  Therefore the working group has decided to modify the
definition of datatype maps to require that facet values be literals, as
is already the case in the Functional Syntax.  The working group feels
that this is an editorial change.

The diffs are:
http://www.w3.org/2007/OWL/wiki/index.php?title=Syntax&diff=18711&oldid=18707

The Direct Semantics document is not being changed, as permitting
arbitrary objects there is not a problem.

Please acknowledge receipt of this email to
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suffice). In your acknowledgment please let us know whether or not you
are satisfied with the working group's response to your comment.

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

Received on Wednesday, 4 March 2009 12:14:59 UTC