On Apr 12, 2007, at 3:44 PM, Peter F Brown wrote:
Ed:
Thanks for a
fascinating overview. My comment on the webmeeting chat line was slightly
facetious when I stated that: “If OWL added identifiers as you suggest,
that would break Tim Berner-Lee's underlying model for Web architecture”,
but I think that you hit the heart of one of the problems that I have with OWL
and with the W3C axioms about information modelling: that is the failure to
distinguish between:
-
a URL as an identifier of something, (in the terms you refer to
in slide 34 [1]); and
-
a URL that is the “something” (a resource)
and the fact that
you can’t actually make any assertion about a URL being considered as an
identifier.
Although not
designed as a standard for inferences and reasoning, the ISO Topic Maps
standard does have an explicit mechanism for capturing and managing identity
(using the concept of published subject identifiers), in the ways you describe
are needed. I’m not sure what other specs out there do likewise, except
for the humble URN…
In either case, we
still have the problem of what you called “relative uniqueness”
rather than, presumably, absolute uniqueness.
I look forward to
seeing you at the Ontology Summit next week!
regards,
Peter
[1] http://ontolog.cim3.net/file/work/DatabaseAndOntology/2007-04-12_EdwardBarkmeyer/InfoModels-Ontologies--EdBarkmeyer_20070412.ppt
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Peter F Brown
Founder, Pensive.eu
Chair, CEN eGovernment Focus Group
Co-Editor, OASIS SOA Reference Model
Lecturer at XML Summer School
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