RE: Proposal to Open and Postpone new issue - compound keys

Done.  New issues list uploaded.

-----Original Message-----
From: Jim Hendler [mailto:hendler@cs.umd.edu] 
Sent: Friday, June 27, 2003 11:02 AM
To: www-webont-wg@w3.org
Cc: Smith, Michael K
Subject: Proposal to Open and Postpone new issue - compound keys


Mike- here is a new issue to raise, and as chair I declare it open (below is
a proposal to close by POSTPONING)

TITLE: Compound Keys
DESCRIPTION:
 Relational Databases often use keys that are composed of multiple fields.
OWL allows keys using owl:InverseFunctionalProperty for a single field
(property).  It would be desirable for OWL to provide the compound keys
capability as well.
STATUS: Open
RAISED BY: J. Hendler based on a Last Call comment raised by Bob MacGregor:
http://lists.w3.org/Archives/Public/public-webont-comments/2003May/0019.html

--------
Proposal to POSTPONE this issue

While compounds keys would be desirable to add, there is some difficulty in
adding them in the current OWL syntax, similar to the problem arising for
"qualified" properties (see discussion under issue 3.2).  In addition, for
the OWL DL profile, it is still something of a research issue as to how
these are best realized by DL reasoners.  There is also a question as to
whether mixing datatype and object type in a compound key would be allowed,
and whether it would cause difficulties to reasoners. 






-- 
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