W3C home > Mailing lists > Public > w3c-rdfcore-wg@w3.org > January 2002

Re: DATATYPING: second draft

From: Pat Hayes <phayes@ai.uwf.edu>
Date: Thu, 24 Jan 2002 10:31:59 -0600
Message-Id: <p05101011b875621db9de@[]>
To: Graham Klyne <Graham.Klyne@MIMEsweeper.com>
Cc: w3c-rdfcore-wg@w3.org
>At 10:19 AM 12/14/01 -0800, Sergey Melnik wrote:
>>  > Dan has raised an issue, rephrased by Pat as how many triples result from
>>>  merging:
>>>     foo bar "10" .
>>>  and
>>>     foo bar "10" .
>Ha!  I came up with exactly this issue in my review of the latest 
>model theory draft.  Do we have a consensus yet?

Well, let me suggest what the answer should be. This may seem odd, but....

I think the answer depends on whether this is a single graph being 
'merged' with itself, or whether it is two distinct, but identical 
(ie isomorphic) graphs. If the former, then the 'merge' is just the 
same graph, with 2 nodes and one arc: a single triple. If the latter, 
then it is a larger graph with three nodes (assuming foo is a uriref) 
and two arcs. This is because different occurrences of a 'bare' 
literal have to be treated as distinct nodes (in case one of them 
should get itself attached to a different datatyping scheme from the 
other...), unlike urirefs. Notice that if you did a similar exercise 
with two copies of an all-uriref triple:

foo bar baz .

then the merged graph would be the same in either case, ie it would 
simply be a single triple; since in this case, the merging would 
(re-)identify the two copies of each uriref.


IHMC					(850)434 8903   home
40 South Alcaniz St.			(850)202 4416   office
Pensacola,  FL 32501			(850)202 4440   fax
Received on Thursday, 24 January 2002 11:31:52 UTC

This archive was generated by hypermail 2.4.0 : Friday, 17 January 2020 20:24:08 UTC