The URI is an identifier that "can" be dereferenced but may be
sufficient in its uniqueness that actual access to the defining
resource is very infrequent. I need to know we are both referring to
the same "gram" but I don't need to retrieve the definition to know
what it is. (01)
On Jul 9, 2009, at 10:30 AM, John F. Sowa wrote: (02)
> Redirecting this thread from ontology-summit to ontolog forum.
> Martin and David,
> All modern technology is based on universal identifiers such
> as 'gram' and 'volt', which are unique within the domain of
> measurement. For such purposes, the methods of resolving the
> identifiers are far more secure than any method based on URIs.
> A URI for the term 'gram', for example, would be a single point
> of failure that could be attacked by any novice-level hacker.
> I agree with both of those points:
> MH> Using [old fashioned paper methods] provide more legal/
>> administrative control that can be used to maintain the meaning
>> associated with the symbol. In particular, there is a lot of
>> "old economy" legal power to enforce compliance etc.
>> URIs, in contrast, have the advantage that they drastically reduce
>> the cost for the community to look up the intended meaning of the
>> symbol (i.e. the URI), which reduces the familiarization costs and
>> may support convergence in the usage of the symbol in communication.
> That "old economy" had a lot of faults, but just note the recent
> economic disaster caused by people who used computers to avoid the
> controls of the "old economy".
> MH> So, IMO, URIs are the best technique that mankind has had so far
>> for establishing and maintaining / renewing consensus about the
>> meaning of those identifiers.
> If you replace "best" with "an interesting new", I'll accept that
> statement. But so far, the people who are reaching that consensus
> have been innocent academics or worse the experienced kind of
> people who rejected the controls of the "old economy".
> DL> In the future ISO may assign identifiers to things rather than
>> documents. These identifiers may be URIs, and ISO may provide
>> a Web service so that dereferencing a URI for a thing redirects
>> to a document that defines the thing.
> Yes, I'm aware of that danger. But for any kind of mission-critical
> application, it's essential to guarantee that those dereferencing
> methods are secure. Since secure methods are likely to have a
> higher level of overhead, it's important to dereference a single
> secure URI for an entire ontology, which includes the unique names
> such such as 'gram', 'kilogram', etc.
> Granularity down to the level of individual names is too dangerous
> and inefficient for each and every identifier used in an ontology.
> Note the following article (one of many):
> SEOUL, South Korea — A wave of cyberattacks aimed at 27 American
> and South Korean government agencies and commercial Web sites
> temporarily jammed more than a third of them over the past five
> days, and several sites in South Korea came under renewed attack
> on Thursday.
> If the current methods for using URIs ever became widely adopted in
> mission-critical applications, Kim Jong-il would be able to accomplish
> his grandest dream:
> Reduce the entire world economy to the level of North Korea.
> For critical identifiers, such as the terms of an ontology, it is
> essential to perform a single dereferencing operation for an entire
> lexicon. Within the ontology we can continue to use humanly readable
> identifiers, such as 'gram', 'volt', 'ampere', etc. Those terms are
> secure because there is no single point of failure, such as a URI.
> John Sowa
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