- From: Steve Harris <steve.harris@garlik.com>
- Date: Tue, 7 Jul 2009 12:16:04 +0100
- To: Lee Feigenbaum <lee@thefigtrees.net>
- Cc: Eric Prud'hommeaux <eric@w3.org>, public-rdf-dawg@w3.org
On 7 Jul 2009, at 01:58, Lee Feigenbaum wrote:
> Do you mean s/MINUS/UNSAID, I imagine
>
>> Result U3 (extrapolated from UNSAID results above):
>> ?who ?nam _:eve "eve"
>
> If I understand UNSAID correctly, you'd do the above MINUS query as:
>
> ?who foaf:givenname ?name .
> UNSAID {
> ?who foaf:holdsAccount ?act .
> ?act foaf:accountName ?name .
> }
>
> "People with a certain name for whom it is unsaid that their account
> has the same name."
>
> Is that right or wrong?
>
> If it's right, I find (to me) the UNSAID way to be a much more
> natural way of writing this query - I'm not actually convinced the
> MINUS version is any clearer than OPTIONAL + !bound :-)
Interesting, I find it easier to get my head around MINUS. For UNSAID
with OPTIONAL I'd have to map that into a MINUS expression to figure
out what (if anything) it meant.
- Steve
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Received on Tuesday, 7 July 2009 11:16:41 UTC