- From: Jos De_Roo <jos.deroo@agfa.com>
- Date: Tue, 23 Dec 2003 00:52:32 +0100
- To: "David Menendez <zednenem" <zednenem@psualum.com>
- Cc: www-rdf-interest@w3.org, Graham Klyne <gk@ninebynine.org>
David Menendez writes:
> Jos De_Roo writes:
>
>> Using <uri-of-some-set-of-triples> as an example
>> was misleading. We normally identify the *document*
>> on which the rdf formula is written and so it would
>> have been better when I would have used
>> <uri-of-some-rdf-document> and then I still think
>> that we *call* some-set-of-triples
>> <uri-of-some-rdf-document>!log:semantics
>
> Does <uri-of-some-rdf-document> indicate a resource available through
> the web? If so, is the assumption that log:semantics may relate the same
> resource to different graphs over time?
I believe so...
> For example, Alice might post a FOAF profile at
> <http://example.com/alice>, leading to this data:
>
> <http://example.com/alice> log:semantics {
> _:a rdf:type foaf:Person.
> _:a foaf:mbox <mailto:alice@example.com>.
> _:a foaf:name "Ailce".
> }.
>
> The next day, she fixes the typo, and we get:
>
> <http://example.com/alice> log:semantics {
> _:a rdf:type foaf:Person.
> _:a foaf:mbox <mailto:alice@example.com>.
> _:a foaf:name "Alice".
> }.
>
> This means we can't treat <http://example.com/alice>!log:semantics as an
> identifier of a specific graph, because it indicates different graphs at
> different times.
It is indeed true that it could indicate different graphs at
different times.
[[
There are several aspects of meaning in RDF which are ignored
by this semantics; in particular, it treats URI references as
simple names, ignoring aspects of meaning encoded in particular
URI forms [RFC 2396] and does not provide any analysis of
time-varying data or of changes to URI references.
]] -- http://www.w3.org/TR/rdf-mt/
or in an earlier draft
[[
Similarly, the model theory given here has no special provision
for tracking temporal changes; it assumes, implicitly, that
URIs have the same meaning whenever they occur. (If one wishes
to apply RDF in a context where the referents of URIs (or names
more generally) may change with time, then the current theory
could be regarded as defining a 'snapshot' of the meaning of a
changing representation.)
]] -- http://www.w3.org/TR/2001/WD-rdf-mt-20010925/
I believe that the 'snapshot' idea can be engineered
(put into engines :-))
--
Jos De Roo, AGFA http://www.agfa.com/w3c/jdroo/
Received on Monday, 22 December 2003 18:52:40 UTC