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Simon,
> Paul Prescod wrote:
> > When you ask Google for a cached page, it is not looking up the page
> > (that's the whole point). It is using the URI as an identifier and
> > checking what information it has associated with that identifier.
>
> But that re-use is tightly bound to the original locating power of
> retrieving documents using HTTP URLs. Using Google to look up
> information on URNs isn't nearly as useful unless someone's built a
> URL-based description.
>
Exactly!
That is the whole point. It is the _combination_ of a URN and URL that makes Google interesting. Each alone would be ho hum. What makes URIs interesting (e.g. for Google) is exactly that they combine naming with content retrieval.
They might have been called URNLs -- which would no doubt be the preference of plenty of folks :-)
Jonathan
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