On Jul 2, 2010, at 7:27 AM, Paul Gearon wrote:
On Fri, Jul 2, 2010 at 2:16 AM, Reto Bachmann-Gmuer
<reto.bachm...@trialox.org> wrote:
Serialization formats could support
"Jo" :nameOf :Jo
as a shortcut for
[ owl:sameAs "Jo"; :nameOf :Jo]
and a store could (internally) store the latter as
"Jo" :nameOf :Jo
for compactness and efficiency.
While this may be possible, you've promoted owl:sameAs to have a true
semantic relationship at this level. You're treating it as if it
really does mean "equals".
Well, it does mean that, according to the OWL specs.
Given your scenario, I'd expect:
[ owl:sameAs "foo", "bar" ]
to lead to the following being stored:
"foo" owl:sameAs "bar"
Since we only got here because owl:sameAs is being treated as having
equality semantics at the RDF level, then I *think* that this is
inconsistent.
Yes, it is.
I'll confess that I don't understand some of the
subtleties surrounding datatypes
You didn't use datatypes in that triple, so...
, so I'll let others confirm this for
me. Presuming that it *is* wrong, then this introduces the possibility
of inconsistent RDF, something that is currently impossible (with the
exception of XML literals, but that's another story)
Actually its the same story. Literals generally have *fixed*
interpretations, fixed by the semantics of the language. Whenever you
have this, you have the possibility of inconsistencies.
, and something we
don't want. I'm more than happy for inconsistencies to be possible at
a higher level (e.g. OWL-DL), but not in RDF.
Why not? Inconsistency is just another way to say entailments. If
there are no inconsistencies possible in RDF, then there are no
significant entailments from any RDF. So RDF is just a bunch of
triples, with nothing that can be done to them except look at them.
Pat
Even if I'm wrong and it's OK, I'd still feel uncomfortable building a
system that can do this.
Regards,
Paul Gearon
------------------------------------------------------------
IHMC (850)434 8903 or (650)494 3973
40 South Alcaniz St. (850)202 4416 office
Pensacola (850)202 4440 fax
FL 32502 (850)291 0667 mobile
phayesAT-SIGNihmc.us http://www.ihmc.us/users/phayes
